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Which of the following options can be used for entry into a holding pattern ? [ Answer reports ]

Question 196-1 : The dme arc defining the fix the entry radial to the start of the inbound leg tracking to the vor any track into the vor/dme fix

Note the feedback strongly suggests that this is a question asked in previous rnav exams even though there are no learning objectives within the rnav syllabus that pertain to it .it is more of an air law question and even then it is on the edge of learning objective 010 06 05 01 10 .the good thing is that it is a very distinctive question that will be easy to remember for the exam ..refer to figures .there are a few different places a holding pattern can be constructed over ndbs vors over a vor/dme fix or over an rnav waypoint not a conventional nav aid .the most complex of those is certainly the vor/dme fix .technically a hold can be placed on 2 intersecting radials but they are extremely rare .in the 1st annex above stockholm arlanda overview of all holding patterns there are all the different types of holds shown .starting from the top you can see hammar hmr vor and there is a hold there with the inbound course of 191° and left turns and 1 5 minute legs usually 1 min legs are used but this is a higher altitude hold .below this is the erken erk ndb hold based directly on the ndb .to the far left of the chart is the tinka hold which is simply based on an rnav/rnp waypoint .the furthest south holding pattern nilug is a hybrid it is an rnav waypoint but with a vor/dme fix given so that it can be flown using conventional nav aids .this is what the question is asking about .there are 3 more of these on the chart eltok balvi and xilan ..firstly note that all these vor/dme holds all have inbound courses directly towards the vor this is so the inbound course can always be tracked which is a key requirement of any holding pattern technically they can also track directly away from the vor but i have never seen one published .in the case of the nilug hold the pilot will fly inbound on the 007° to course radial 187 towards tebby teb vor until reaching a dme distance of 44 2 nm then begin the right hand turn and do the rest of the procedure using timings which is very normal until established on the inbound course again where tracking resumes until 44 2d etc .they are easy enough to fly if a little inaccurate due to being so far from the vor the difficulty arrives due to the fact that they can only be joined from particular directions .as can be seen in the annex above they can only be joined using conventional nav aids from .a the vor radial.b the dme arc where specified or.c the entry radial to a vor/dme fix at the end of the outbound leg as published .by far the most common way and easiest is by the vor radial but that is not one of the available options so we have to say the dme arc defining the fix in this case 44 2 nm .see the 2nd annex for a view of the dme arc for this example exemple 296 The dme arc defining the fix.The dme arc defining the fix.

What causes 'mountain effect' and what type of navigational aid does it affect ?

Question 196-2 : It is caused by diffraction and affects ndbs it is caused by refraction and affects ndbs it is caused by diffraction and affects vors it is caused by refraction and affects vors

Learning objective 062 02 02 05 01 ndb section describe diffraction of radio waves in mountainous terrain mountain effect .because ndbs produce lf and mf radio waves which travel primarily as surface ground waves for the purposes of directional navigation as is required for ndbs the ground that is being travelled over matters a lot water is flat for instance so surface waves travel over water faster and much further than a similar strength wave travelling over rolling hills built up areas and worst mountainous terrain basically the more obstacles and rougher the terrain the worse the ndb signals travel .this is most prominent in mountainous terrain as the radio waves try and follow the contours of the ground which means going over the peaks and into the valleys the largest problem with this is a phenomenon known as diffraction where the wave gets scattered slightly as it crests each mountain and tries to go down the other side .reflection of the waves also could be an issue but does not affect ndb directions received by aircraft as much as the relative diffraction of mountains exemple 300 It is caused by diffraction and affects ndbs.It is caused by diffraction and affects ndbs.

You are established on an ils approach at 4 nm on the dme and get some signal ?

Question 196-3 : Multipath interference from reflections off objects within the published coverage area you get interference because of being outside the published coverage area reverse sensing side lobes picking up the 'false glide slope'

Learning objective 062 02 05 04 08 explain that multipath interference is caused by reflections from objects within the ils coverage area .we can be sure that the aircraft is within the coverage area in this question as it is fully established on the ils approach at 4 nm it is most likely to be descending on the glide path as well as on the localiser this leaves only one answer available as none of the other options happens when within the correct coverage area of the ils .reflections of the ils signals off objects can hit the aircraft at certain stages of the approach altering the difference in depth of modulation between the 90 hz and the 150 hz lobes and can cause a false movement of the ils needles which in turn can affect the autopilot if one is engaged exemple 304 Multipath interference from reflections off objects within the published coverage area.Multipath interference from reflections off objects within the published coverage area.

You are flying on radial 227° inbound to a vor the wind is from 270° and the ?

Question 196-4 : 1 047° 2 044° 1 227° 2 230° 1 047° 2 047° 1 237° 2 233°

Refer to figure . if we are flying inbound on the 227° radial then our track has to be the opposite 047° 047° is therefore what we also want to set as our obs course as we want the needle to indicate in the correct sense as we track to the vor the wind in this scenario is coming from 270° it does not matter whether true or magnetic which is a partial tailwind blowing across from the left this means that we have to turn left by our wind correction angle 3° to track 047° this gives us a heading of 044° to fly all our bearings and tracks are in magnetic as this is what is used by vors and the wind does not matter as 10° different would still make the wind a tailwind/crosswind from the left exemple 308 (1) 047°; (2) 044°(1) 047°; (2) 044°

A doppler vor provides usable signals up to what distance from the station and ?

Question 196-5 : Up to 200 nm from dvor for en route ifr traffic up to 100 nm from dvor for military ifr traffic up to 75 nm from the terminal area for all traffic within the control zone up to 25 nm from the approach area for traffic following lnav approaches

Learning objective 062 02 03 01 04 state that the following types of vor are in operation conventional vor cvor a first generation vor station emitting signals by means of a rotating antenna doppler vor dvor a second generation vor station emitting signals by means of a combination of fixed antennas utilising the doppler principle en route vor for use by ifr traffic terminal vor tvor a station with a shorter range used as part of the approach and departure structure at major aerodromes test vor vot a vor station emitting a signal to test vor indicators in an aircraft .as stated in the learning objective above dvors are powerful enough to be used by en route ifr aircraft for reliable navigation by looking in the enr section of an aip the useful ranges of the vors can be seen and the maximum is 200 nm distance and 50 000 ft altitude exemple 312 Up to 200 nm from dvor for en-route ifr traffic.Up to 200 nm from dvor for en-route ifr traffic.

When tuned in to an ndb when is dip error most likely to occur ?

Question 196-6 : When turning towards the ndb within the ndb's cone of confusion when tracking or homing to the ndb with a crosswind when flying directly away from the ndb

Learning objective 062 02 02 05 03 explain that the bank angle of the aircraft causes a dip error ..dip error is an inaccurate reading of the bearing information when the aircraft is banked this is because the adf system that receives and interprets ndb signals was designed to work when in horizontal flight when a turn is initiated the indicated bearing is modified the needle will cause an error towards the direction of whichever wing is banked down exemple 316 When turning towards the ndb.When turning towards the ndb.

When holding at an ndb you are approaching the beacon on the inbound leg how ?

Question 196-7 : The head of the needle will be pointing to the fix and the needle will turn 180° when passed it the head of the needle will be pointing away from the fix and the needle will turn 180° when passed it the to indication will become a from indication after passing the fix the indicator will go from full left deflection to full right deflection when passing the fix

Refer to figure .a holding pattern requires an aircraft to fly towards the holding fix on a certain 'inbound' track and when the aircraft reaches the fix vor ndb or a vor/dme fix the pilots should begin a 180º turn right is standard but left turns can be used upon the end of this turn or passing abeam the beacon the pilot will then fly a timed leg on the opposite track plus any wind correction to the inbound leg now called the outbound leg then turn back onto the inbound leg to start the process again this forms the familiar racetrack pattern an ndb simply produces a signal of particular frequency and the adf receiver in our aircraft picks this up and tells us from where it came this is very simple and means we can follow an adf needle all the way to the beacon when it will then become very sensitive and go from pointing ahead of the aircraft to pointing behind it as per the location of the ndb this is different from a vor which we would track inbound via a cdi course deviation indicator which flicks from to to from upon passing the beacon and also has a cone of confusion exemple 320 The head of the needle will be pointing to the fix and the needle will turn 180° when passed it.The head of the needle will be pointing to the fix and the needle will turn 180° when passed it.

You are flying the inbound course of an ndb holding pattern in an area of local ?

Question 196-8 : The needle will point towards the thunderstorm the needle will keep moving from the top to the bottom of the adf the needle will be moving erratically especially at night no disturbance

Note we require further feedback about this question from the exam .in particular we belive two of the answers are partly correct .the needle would point towards the thunderstorm very often but would also act erratically however it shouldn't matter whether it is night or day the night effect is to do with other ndbs which are usually out of range during the day the effect should be the same which makes us want to discount that erratic option ..learning objective 062 02 02 05 02 state that static radiation energy from a cumulonimbus cloud may interfere with the radio wave and influence the adf bearing indication ..thunderstorms can have very powerful discharges of static electricity across much of the electromagnetic spectrum including in low frequency lf and medium frequency mf .these discharges cause the most severe errors in adf receivers .a static discharge in a cumulonimbus cloud cb can be heard as a loud crackle on the audio and the needle will move rapidly to the source of the cb .if there are several active thunderstorms in the area the needle might point to them for a longer period .as thunderstorms are incredibly powerful the electromagnetic waves they give off can easily overpower that of an ndb especially if it is only a low power locator beacon exemple 324 The needle will point towards the thunderstorm.The needle will point towards the thunderstorm.

During an ils approach with 3º glide slope you initiate a go around when the ?

Question 196-9 : The aircraft is flying within the side lobes of the glide path signal the instrument has failed and has kept the previous indication the aircraft is flying through the opposite runway glide path the approach has a higher glide path

Refer to figures . the glidepath of an ils works similar to the localizer except the glidepath operates in the ultra high frequency uhf instead of the very high frequency vhf band .as seen in the figure there are 2 lobes on the glidepath .one lobe at 90 hz which indicates that the aircraft is above the glidepath .and one lobe at 150 hz which indicates that the aircraft is below the glidepath .the centre is typically set to a 3° glidepath this is not a perfect system and the glidepath can suffer from the presence of false glidepaths above the correct one .these are due to both the weak sidelobes of the original 150 hz and 90 hz lobes which are created and intensified by the reflection of the lower signals off the ground or nearby obstacles .this is the similar to multipath interference of the localiser but is more easy to predict .these false glidepaths are reverse sensing see 2nd annex above and usually exist at odd multiples of the original glidepath and are the reason why we procedurally will intercept the glidepath from below to avoid encountering a false glidepath note we have had updated feedback in the comments on this question but could still use more to fine tune the wording and check the other options exemple 328 The aircraft is flying within the side lobes of the glide path signal.The aircraft is flying within the side lobes of the glide path signal.

You are flying across northern canada on airway nca whiskey you wish to cross ?

Question 196-10 : 188° 118° 194° 298°

Refer to figure .to cross check our position using a chart we must find the true bearing from a known position to our aircraft in this case the known position is the churchill vor and we are on radial 190° radials from vors are in magnetic so we know the magnetic bearing from the vor to the aircraft is 190° m and also that we should use the variation at the vor to calculate our true bearing an easy way to remember this is that v is for vor and also for variation so use the variation at the vor there are many ways to turn this into a true bearing one of which is the rhyme variation east magnetic least .variation west magnetic best therefore our magnetic bearing of 190° is greater than our true bearing by the amount of 2° so the true bearing to plot from the vor on the chart would be 188° t note 1 another piece of information would still be required to compute the position of the aircraft such as another vor bearing or a dme readout .note 2 in canada airspace northern domestic airspace nda is the area of compass unreliability within which runways and navaids are oriented to true north however churchill vor is not included in nda airspace as they would have to specify this in the question .note 3 there is another extremely similar question with radial 300° so do not get this mixed up with that one or vice versa exemple 332 188°188°

What criteria must be met to be considered 'established' on an ndb approch ?

Question 196-11 : The bearing pointer must be within 5º of the required course the relative bearing must be less than 5º the wind correction angle must be less than 5º variation due to reflections from terrain may not exceed 5º

A non directional beacon ndb is a ground based low frequency radio transmitter used as an instrument approach for airports and offshore platforms .the ndb transmits an omni directional signal that is received by the adf or automatic direction finder a standard instrument onboard aircraft the pilot uses the adf to determine the direction to the ndb relative to the aircraft .ndb's can be used to provide a non precision approach to an airport a pilot can make sure to be aligned with the correct approach path by maintaining the same qdm with the adf and can manage vertical guidance using their altimeter with a minimum descent height/altitude .in terms of lateral errors permitted flying an ndb approach you must maintain a qdm/qdr that is ± 5° of the designated approach path this is also the range in which an aircraft can be considered 'established' on the approach ..as the process of flying ndb approaches varies depending on the cockpit hardware this question could potentially cause some confusion let's look at each option .. 'the relative bearing must be less than 5º '. . this is incorrect as the relative bearing direction of the adf pointer relative to the aircraft heading will vary due to the wind correction angle an aircraft could be perfectly flying an inbound course of 270º but with a 10º right wind correction so heading 280º the relative bearing would be 350º 10º left of the nose but the aircraft would be established . . . 'the bearing pointer must be within 5º of the required course '. . this is true as the bearing pointer indicates the qdm when using an rmi or converting a fixed card adf and that must be within 5º of the correct inbound course for the approach as long as that criteria is satisfied the aircraft is considered established the wording could be better to include all versions of aircraft hardware but this is correct in essence and far more correct than the other options . . . 'the wind correction angle must be less than 5º '. . the wind correction angle does not matter as long as the aircraft is within 5º of the required qdm it is established . . . 'variation due to reflections from terrain may not exceed 5º '. . variations due to terrain reflections can affect ndb signals but should not do so too much on ndb approaches as this should be flight tested etc nonetheless ndb approaches have terrible accuracy and many errors hence the high minimums as we cannot determine the errors at any one time we can only use the instrument readout that we have so a high error does not mean that we are not established exemple 336 The bearing pointer must be within 5º of the required course.The bearing pointer must be within 5º of the required course.

On a back beam ils approach with the inbound course from the chart set on the ?

Question 196-12 : The cdi will be reverse sensing with no glide path information they will receive no glide path information but correct azimuth indications on the cdi they will receive limited glide path information but correct azimuth indications on the cdi the cdi will be reverse sensing with limited glide path information

Refer to figures . an ils localiser uses two lobes of differently modulated signals one is modulated at 150 hz and the other at 90 hz the ils receiver on an aircraft interprets the amount of each signal as an indication of how far the aircraft is from the centre of the localiser and on which side this indication is shown directly on the display the obs omni bearing selector which is used for vor radial tracking does not have an impact on the displayed ils readings the course deviation indicator cdi will just show 'fly left' or 'fly right' according to the signals it receives a horizontal situation indicator hsi has a simple cdi in the middle of the slaved gyro compass which can be turned to face any direction on the gyro compass but when receiving ils signals will only show exactly what it receives fly left or fly right the direction of the cdi does not affect the cdi localiser indications just how we view them the localiser of an ils approach can produce a secondary 'back beam' which goes exactly the opposite direction to the original localiser this will allow for an approach to be performed using this 'back beam' but it is limited by the fact that it will be reverse sensing in localiser indications and has no glide path signal so is a non precision approach only if the back beam is not required it is often suppressed to avoid any confusion see the second annex above an approach chart for a back course approach the charted approach course is 016º but the standard ils front course approach is to the opposite runway and is 196º inbound if we related this chart to our question we are going to fly 016º inbound course using the loc back beam and have our hsi course set to 016º as we are about to discuss this is actually not the best course to set when using a ils back course the usual signal lobes are reversed so the cdi in the centre of the hsi will be reverse sensing this is the scenario of this question and what we see on the left hand side of the first annex above the hsi is reverse sensing with the 'back course' direction set usually however we actually set the direction of the ils front course right hand side of the annex which reverses the direction again and gives us correctly sensing indications this has not been done in this question exemple 340 The cdi will be reverse sensing with no glide path information.The cdi will be reverse sensing with no glide path information.

How can ndbs be used for navigation near the destination aerodrome ?

Question 196-13 : As a locator beacon to start the final approach segment as a marker beacon along the final approach segment as a vor beacon to track a localiser signal along the final approach segment as a dme beacon to give range information along the final approach segment

Learning objective 062 02 02 01 07 define a ‘locator beacon’ an lf/mf ndb used as an aid to final approach usually with a range of 10 25 nm .ndbs are non directional beacons that transmit a simple carrier wave with a modulation to overlay the morse code identifier they are a ground station consisting of just one aerial for transmission .the adf automatic direction finder is the equipment in the cockpit which measures the direction from which the ndb carrier wave signal came and points a needle directly towards the ndb in question on one of the pilot's instruments .ndbs are split into two use categories en route for long range navigation and locator beacons for terminal procedures .as specified in the lo above locator beacons are low powered ndbs and have short ranges of 10 25 nm they are often used as beacons denoting the approach holding pattern or the final approach fix they may be co located with a marker beacon the outer marker usually but ndbs are different from marker beacons which people do occasionally get mixed up exemple 344 As a locator beacon to start the final approach segment.As a locator beacon to start the final approach segment.

You are flying a dme arc as part of a procedure when you begin a descent/climb ?

Question 196-14 : It will not change because the slant range is the same it will increase because the range decreases it will decrease because the range decreases it will increase because the range increases

Refer to figures .the dme cockpit indication can show a few different indications the frequency distance sometimes identifier and sometimes groundspeed this is not a true groundspeed indication though as the only thing it can go off is the rate of increase/decrease of dme range .therefore if the aircraft is flying directly towards or away from the dme the groundspeed indication will be correct* but if flying at any other angles it will be wrong and always indicate less than the actual groundspeed *a dme actually measures slant range between the aircraft and the ground station so the groundspeed indication is slightly off due to this and is more accurate when the slant is shallower so at low altitudes or further away from the station in a dme arc then which is a procedure flown at the same slant range from the dme annex above the groundspeed should read 0 kts as the range is not changing at all .in the descent climb the aircraft's slant range would begin to decrease increase so the aircraft ends up flying slightly further away from closer to the dme in terms of ground distance and maintaining an indicated dme groundspeed of 0 kts exemple 348 It will not change because the slant range is the same.It will not change because the slant range is the same.

Which of the following frequencies may be allocated to a vor station 1 ?

Question 196-15 : 1 and 2 2 and 3 1 only 3 only

The band normally used for aeronautical mobile service ams voice communication is the very high frequency vhf band and is defined between 118 000 and 136 975 mhz the lower part of the spectrum from 108 to 117 975 mhz is reserved for navigational aids such as vor beacons automatic terminal information service atis precision approach systems such as ils or laas frequency band frequencies wave band wave length vlf very low frequency 3 30 khz very long 100 10 km lf low frequency 30 300 khz long 10 1 km mf medium frequency 300 3000 khz medium 1 km 100 m hf high frequency 3 30 mhz short 100 10 m vhf very high frequency 30 300 mhz short 10 1 m uhf ultra high frequency 300 3000 mhz ultra short 1 m 10 cm shf super high frequency 3 30 ghz 3000 30000 mhz super short 10 1 cm ehf extremely high frequency 30 300 ghz extremely short 1 cm 1 mm exemple 352 1 and 2.1 and 2.

Multipath errors are caused by… ?

Question 196-16 : Objects within the ils coverage area objects outside of the ils critical area objects within the ils sensitive area objects within the ils critical area

Refer to figure .062 02 05 04 08 explain that multipath interference is caused by reflections from objects within the ils coverage area the 2 ils localiser lobes and the 2 glideslope lobes can cover a wide area especially when further from the airfield this is known as the ils coverage area any obstacles within this area can reflect the ils signals potentially sending a different amount of one frequency to your ils receiver than it should this is called multipath interference and can cause an ils display to show untrue fluctuations in both the horizontal and the vertical this can be especially dangerous when connected to autopilot which could pitch or roll excessively due to the ils fluctuations exemple 356 Objects within the ils coverage area.Objects within the ils coverage area.

An aeroplane is on approach with nav 1 tuned to the ils frequency and nav 2 ?

Question 196-17 : Full scale deflection quarter scale deflection half scale deflection no deflection

Refer to figure .note this is effectively the reverse way round to question 621370 we have received limited feedback about this question currently so please let us know if you see it in the exam thank you ..vors and ilss often use the same displays in the cockpit with the lateral display of the cdi course deviation indicator useful for displaying vor or localiser deviation and the vertical display showing glide path deviation they do not however have the same level of accuracy as a localiser has to be much more accurate than a vor 4 times more accurate .therefore on a standard 5 dot cdi vors have a deviation indicated by 2 degrees per dot so full scale deflection is 10° deviation from the selected bearing .ils localisers loc on the other hand have just 0 5 degrees per dot deviation so full scale deflection is 2 5° deviation from the localiser centreline .therefore in this scenario where we are on exactly full scale vor deflection we are 10° off the correct inbound course which is more than full scale deflection on the localiser cdi which will show as full scale deflection as we are still within the ils coverage area due to the fact that we are on approach exemple 360 Full scale deflection.Full scale deflection.

As an aeroplane is approaching the runway while taxiing for departure the ?

Question 196-18 : The landing minima for cat ii and ill operations are lower and therefore require greater precision and an aircraft waiting too close to the landing runway may affect the quality of the ils signals because of the lower visibility observed during cat ii and iii operations the landing pilot s may mistake the lights from the waiting aircraft as runway lighting causing a distraction during the landing since aeroplanes perform an autoland during cat i operations the autopilot is able to fly the aeroplane more accurately and therefore the cat i position may be closer to the runway aircraft must be kept further away from the runway during cat ii and ill operations as arriving aeroplanes may land automatically and therefore require more space

Refer to figure . learning objective 062 02 05 05 02 define the ‘ils sensitive area’ an area extending beyond the ils critical area where the parking or movement of vehicles including aircraft is controlled to prevent the possibility of unacceptable interference to the ils signal during ils operations cat ii and cat iii operations require high accuracy standards the aircraft flying cat ii or cat iii approaches follow the ils loc and gp signals and based on these signals they are flown down to a low height above the touchdown or even all the way to the touchdown depending on the category since on precision approaches cat ii and iii the system is capable of bringing the aircraft too low or even on touchdown measures need to be taken to ensure that their signals will not be affected by interference of any kind ils localizer and glide slope signals are radio waves and can therefore be affected by interference the most common type of interference for ils signals are multi path interference and beam bends these can happen for a multitude of reasons but primarily due to the reflections of the radio waves off buildings terrain vehicles etc an aircraft waiting too close to the runway may affect the quality of the ils signals making it harder for the landing aircraft to maintain its course and height accurately therefore a separate holding position is required to ensure that the signals are not affected by other aircraft movements this is the reason that during lvos low visibility operations cat ii/iii approaches at many airports aircraft are required to use different holding points further from the runway in order to remain outside the ils sensitive area also known as the lsa localiser sensitive area exemple 364 The landing minima for cat ii and ill operations are lower and therefore require greater precision, and an aircraft waiting too close to the landing runway may affect the quality of the ils signals.The landing minima for cat ii and ill operations are lower and therefore require greater precision, and an aircraft waiting too close to the landing runway may affect the quality of the ils signals.

At night the ionosphere undergoes changes in ionisation density leading to ?

Question 196-19 : Fading caused by the received ground wave and sky wave going out of phase absorption mostly affects the ground wave and is dependent on the transmission power fading caused by the received ground wave and sky wave going in phase attenuation and its impact are greatest on sky waves with high transmitted frequencies

Refer to figure . night effect . the principal propagation method of ndbs is the ground wave however it is possible for weak sky waves to be returned at night when the ionosphere is less dense and attenuation is least during the day the d layer of the ionosphere absorbs signals in the lf and mf bands at night the d layer disappears allowing the sky wave to interfere with the surface wave this interference occurs due to the different paths taken by the sky wave and surface wave as well as the induction of currents in the horizontal elements of the loop aerial the contamination effect which is observed as fading of the audio signal and the needle 'hunting' is most pronounced around dawn and dusk when the ionosphere is transitioning at shorter distances 30 to 80 miles the sky waves combine with the ground wave signal without any dead space since the sky waves travel a different path they have a different phase compared to the ground wave as a result the aerial null signal is suppressed or displaced in a random manner leading to wandering of the needle on the rmi or rbi this effect is called fading and is most variable during twilight at dawn and dusk exemple 368 Fading, caused by the received ground wave and sky wave going out of phase.Fading, caused by the received ground wave and sky wave going out of phase.

A tacan tactical air navigation radio aid is a uhf military system that may ?

Question 196-20 : Be used for range information by civil aircraft be used for bearing information by civil aircraft not be used by civil aircraft be used for bearing and range information by civil aircraft

Learning objective 062 02 04 01 08 state that military uhf tactical air navigation aid tacan stations may be used for dme information .tacan tactical air navigation systems are military uhf tactical radio aids that can be used by military aircraft with the correct receiver fitted tacans provide military aircraft with magnetic bearing radial and range dme distance information from the station tacan function is similar to vor/dme function but for military aircraft receivers only .if a civil aircraft is tuned to a tacan frequency the aircraft will receive range dme distance information only magnetic bearing information radial will not be available exemple 372 Be used for range information by civil aircraft.Be used for range information by civil aircraft.

When mode c is selected on the aircraft ssr transponder the additional ?

Question 196-21 : Pressure altitude based on 1013 25 hpa altitude based on regional qnh aircraft height based on sub scale setting height based on qfe

Admin .mode c sends the aircraft's pressure altitude provided by the altitude encoder exemple 376 Pressure-altitude based on 1013.25 hpa.Pressure-altitude based on 1013.25 hpa.

The ground secondary surveillance radar ssr equipment incorporates a ?

Question 196-22 : Transmitter 1030 mhz .receiver 1090 mhz transmitter 1090 mhz .receiver 1030 mhz transmitter 1090 mhz .receiver 1090 mhz transmitter 1030 mhz .receiver 1030 mhz

Admin .secondary surveillance radar ssr is a radar system used in air traffic control atc which not only detects and measures the position of aircraft but also requests additional information from the aircraft itself such as its identity and altitude .the interrogation pulses are at one frequency 1030 mhz and the reply pulses are at a different frequency 1090 mhz .the target aircraft's transponder replies to signals from an interrogator by transmitting a coded reply signal containing the requested information exemple 380 Transmitter: 1030 mhz xsxreceiver: 1090 mhzTransmitter: 1030 mhz xsxreceiver: 1090 mhz

Assuming sufficient transmission power the maximum range of a ground radar with ?

Question 196-23 : 333 km 666 km 1333 km 150 km

Admin .maximum theoretical range = velocity of light / 2 x pulse repetition frequency .maximum range = 300000 / 2 x 450.maximum theoretical range = 300000 / 900.maximum theoretical range = 333 km exemple 384 333 km.333 km.

A radio beacon has an operational range of 10 nm .by what factor should the ?

Question 196-24 : Four six two eight

Admin .if you double transmitter power you will increase your range by the square root of 2 1 414 time the range .if you divide 20 nm by square root of 2 = 14 14 nm.and 14 14 by square root of 2 = 10 nm.so you have to increase by a factor of four exemple 388 Four.Four.

Airborne weather radar systems use a wavelength of approximately 3 cm in order ?

Question 196-25 : Detect the larger water droplets transmit at a higher pulse repetition frequency for extended range obtain optimum use of the cosecant squared beam detect the smaller cloud formations as well as large

exemple 392 Detect the larger water droplets.Detect the larger water droplets.

The iso echo facility of an airborne weather radar is provided in order to ?

Question 196-26 : Detect areas of possible severe turbulence in cloud give an indication of cloud tops inhibit unwanted ground returns extend the mapping range

Admin .with a monochrome screen it is difficult to distinguish between the severities of turbulent clouds when iso echo is activated a level supplements the automatic gain visual threshold set un weather mode the shap of return on the radar depends upon the gain level of the cloud .the effect is to create a black hole in the cloud by reversing and ampliflying the signal this reversal brings the signal below the automatic gain visual threshold and so no return appears in the middle of the cloud . 2612.turbulence severity is assessable using the above picture . > the hole shows an area of high turbulence . > the outer ring shows the severity of the turbulence gradient within the cloud . the narrower the retaining ring the steeper the gradient . the wider the outer ring the more slack the gradient exemple 396 Detect areas of possible severe turbulence in cloud.Detect areas of possible severe turbulence in cloud.

In the mapping mode the airborne weather radar utilises a ?

Question 196-27 : Fan shaped beam effective up to a maximum of 50 nm to 60 nm range fan shaped beam effective up to a range of 150 nm pencil beam to a maximum range of 60 nm pencil beam effective from zero to 150 nm

Admin .this answer is not accurate today most radars can have a much longer range than that in the mapping mode up to 120 nm . boeing 737ng navigation displays map mode . 2613 exemple 400 Fan shaped beam effective up to a maximum of 50 nm to 60 nm range.Fan shaped beam effective up to a maximum of 50 nm to 60 nm range.

Which of the following cloud types is most readily detected by airborne weather ?

Question 196-28 : Cumulus cirrocumulus stratus altostratus

exemple 404 Cumulus.Cumulus.

Why is a secondary radar display screen free of storm clutter ?

Question 196-29 : The principle of 'echo' return is not used in secondary radar the frequencies employed are too high to give returns from moisture sources a moving target indicator facility suppresses the display of static or near static returns the frequencies employed are too low to give returns from moisture sources

exemple 408 The principle of 'echo' return is not used in secondary radar.The principle of 'echo' return is not used in secondary radar.

In order to indicate radio failure the aircraft ssr transponder should be ?

Question 196-30 : 7600 7700 7000 7500

Admin .7600 radio communication failure .7500 unlawful interference with the planned operation of the flight .7700 emergency situation exemple 412 7600.7600.

In order to indicate unlawful interference with the planned operation of the ?

Question 196-31 : 7500 7600 7700 7000

Admin .7600 radio communication failure .7500 unlawful interference with the planned operation of the flight .7700 emergency situation exemple 416 7500.7500.

An apparent increase in the transmitted frequency which is proportional to the ?

Question 196-32 : The transmitter moves towards the receiver the transmitter moves away from the receiver the receiver moves towards the transmitter both transmitter and receiver move towards each other

Admin .because the radio signals travel at a constant speed assuming they are not refracted by the atmosphere the receiver can calculate exactly how far away it is from the transmitter .speed is most often calculated by the receiver using the doppler effect which is the process by which the frequency of a signal changes due to the relative motion of the transmitter frequency is raised when the transmitter moves towards the receiver exemple 420 The transmitter moves towards the receiver.The transmitter moves towards the receiver.

A primary radar operates on the principle of ?

Question 196-33 : Pulse technique transponder interrogation phase comparison continuous wave transmission

exemple 424 Pulse technique.Pulse technique.

The main factor that limits the range of an ndb is the ?

Question 196-34 : Transmitted power height of the transmitter direction of the plane of polarisation identification modulation signal

exemple 428 Transmitted power.Transmitted power.

The two main design functions of secondary surveillance radar ssr mode s are ?

Question 196-35 : Air to ground and ground to air data link communications and improved atc aircraft surveillance capability collision avoidance using tcas ii and improved long range hf communication capability continuous automatic position reporting using global positioning system gps satellites and collision avoidance using tcas ii the elimination of ground to air communications and the introduction of automatic separation between aircraft using tcas ii

exemple 432 Air to ground and ground to air data link communications and improved atc aircraft surveillance capability.Air to ground and ground to air data link communications and improved atc aircraft surveillance capability.

A frequency of 10 ghz is considered to be the optimum for use in an airborne ?

Question 196-36 : The larger water droplets will give good echoes greater detail can be obtained at the more distant ranges of the smaller water droplets static interference is minimised enables the aircraft to detect clear air turbulence

Admin .a high frequency is used since it gives strong return of echoes from big water droplets and clouds of high water contents usually thunderstorm movements but do not reflect the clouds with lower contents of water or fog exemple 436 The larger water droplets will give good echoes.The larger water droplets will give good echoes.

Which of the following is a complete list of airborne weather radar antenna ?

Question 196-37 : Roll and pitch roll pitch and yaw pitch and yaw roll and yaw

Admin .weather radar antenna in the nose radome of a boeing 757 . 2547.you can clearly see the stabilisation system . 2548 exemple 440 Roll and pitch.Roll and pitch.

In an airborne weather radar that has a colour cathode ray tube crt increasing ?

Question 196-38 : Green to yellow to red yellow to amber to blue green to red to black yellow to orange to red

Admin . 2614 exemple 444 Green to yellow to red.Green to yellow to red.

When an aircraft is operating its secondary surveillance radar in mode c an air ?

Question 196-39 : 100 ft 200 ft 250 ft 150 ft

Admin .air traffic controller's presentation gives information regarding the aircraft's indicated flight level mode c in increments of 100 ft . 2615.afr1670 air france 1670 .038 3800 ft climbing m15 control sector m15 exemple 448 100 ft.100 ft.

A radar facility transmitting at a pulse recurrence frequency prf of 1200 ?

Question 196-40 : 69 nm 135 nm 270 nm 27 nm

Admin .maximum range = pulse repetition time/ 2 x 0 162 nm/microsecond .pulse repetition time = 1 x 106 / recurrence frequency.pulse repetition time = 833 33.maximum range = 833 33/2 x 0 162 = 67 5nm .also .velocity of light = 300000km/s.range = 300000/prf x 2.range = 300000/1200 x 2.range = 125km ==> 67 5nm exemple 452 69 nm.69 nm.

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