Question 205-1 : On which of the following radar displays is it possible to get an indication of the shape and to some extent the type of the aircraft generating the return ? [ Exam pilot ]
Aerodrome surface movement radar asmr
.surface movement radar smr systems are used by air traffic controllers to detect and guide aircraft and vehicles i e baggage carriers buses supply trucks staff cars etc on the ground surface of the airport and thus secure safety it is the most widely used surveillance system for airport surveillance at present .it is sometimes possible to identify aircraft types from the return
Question 205-2 : Which of the following lists the phenomena least likely to be detected by radar ?
Clear air turbulence
.the weather radar only detects precipitation droplets .how much it detects depends upon the size composition and number of droplets water particles are five times more reflective than ice particles of the same size .the radar does detect . rainfall. wet hail and wet turbulence. ice crystals dry hail and dry snow however these three elements give small reflections .the radar does not detect . clouds fog or wind droplets are too small or no precipitation at all . clear air turbulence no precipitation
Question 205-3 : Which one of the following is an advantage of a secondary radar system when compared to a primary radar system ?
The required power of transmission from the ground equipment is reduced
Admin .secondary surveillance radar emits an interrogation pulse rather than a beam of energy you get back a response from the transponder rather than reflected energy .calculating the time to response and return plus where the aerial was pointing during the process gives you the return on the display .thus the required power of transmission from the ground equipment is reduced
Question 205-4 : What information may be displayed on an atc radar screen connected only to a primary radar system ?
Aircraft position only
Question 205-5 : In an airborne weather radar the areas of greatest turbulence are usually indicated on the screen by ?
Colour zones of red and magenta
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Question 205-6 : Airborne weather radars are generally based on the use of ?
Primary radar in the shf band
Question 205-7 : Mode a or c garbling may occur to ?
Two or more aircraft in the same direction from the interrogator with a difference in slant range of less than 1 7 nm
Admin .disadvantages of ssr mode a/c . code garbling of aircraft less than 1 7 nm apart measured in the vertical plane perpendicular to and from the antenna . 'fruiting' which results from reception of replies caused by interrogations from other radar stations
Question 205-8 : In a primary pulse radar you have ?
A directional aerial for both transmission and reception
Question 205-9 : A tcas ii equipped a/c will have mode s because ?
The datalink is required to co ordinate evasive manoeuvres
Mode s selective is designed to allow automatic collision avoidance .sense of ras coordinated between tcas equipped aircraft resolution advisories so tcas ii traffic alert and collision avoidance system automatically implies mode s transponder .the ra intensity is checked and revised if necessary every second ..more information can be found by using the link below
Question 205-10 : How does a mode s interrogator identify aircraft ?
A 24 bit identifier giving over 16 million combinations
Admin .the provision of air traffic services ats using ssr mode s initially in a central area of european airspace will rely on a unique icao 24 bit aircraft address for selective interrogation of individual aircraft the 24 bit aircraft address is also an essential element of the airborne collision avoidance system acas ii in addition mode s surveillance requires the reporting of aircraft identification as stated in circular aic a 01/04 concerning mode s airborne equipment requirements.the aircraft address shall be one of 16 777 214 twenty four bit aircraft addresses allocated by icao to the state of registry or common mark registering authority and assigned as prescribed in the appendix to chapter 9 part i volume iii icao annex 10 .all mode s equipped aircraft engaged in international civil aviation are required to have an aircraft identification feature as prescribed in icao annex 10 volume iv chapter 2 2 1 5 2
Question 205-11 : Which statement with respect to interrogation modes is correct ?
Mode s broadcast will transmit information to all mode s transponders
Admin .mode s is a secondary surveillance radar technique that permits selective interrogation of aircraft by means of a unique 24 bit aircraft address thus avoiding the risk of confusion or mis identification due to overlapping signals mode s has been standardised by icao for many years it employs ground based interrogators and airborne transponders and operates in the same radio frequencies 1030/1090 mhz as conventional ssr systems with which it is backwards compatible .mode s ground interrogators transmit a mode s all call at a steady rate similar to a conventional ssr . any mode s transponder that is not 'locked out' will reply to the interrogation transmitting its 24 bit aircraft address registration and its aircraft identification call sign
Question 205-12 : To improve the detection of precipitation area s in e g thunderstorms in which the top of the cloud lies at or slightly above the level of flight ?
The tilt setting should be lower when the aircraft climbs to a higher altitude
Admin . 2620.if the top of the cloud lies at or slightly above the level of flight and you decide to climb it will be better to tilt down your weather radar to maintain a good awareness of the situation .if not you will not be able to see precipitations the risk is to see clear sky above the clouds and thus you will not be able to avoid large area of turbulences
Question 205-13 : Garbling is caused by ?
Aeroplanes in close proximity responding to the same interrogation
Question 205-14 : Airborne weather radar has been primarily developed to detect ?
The kinds of precipitation which are usually accompanied by turbulence
Question 205-15 : When an operator increases the range on a radar display in general ?
The prf becomes lower and the pulse length larger
When an operator increases the range on a radar display larger pulses have smaller resolution and the prf pulse repetition frequency therefore needs to be slower to detect more distant pulses . onofrio .think about formulas .max unambigious range c/2xprf so prf has to decrease to increase the range .and.minimum range pl/2 so pl has to increase to increase the range
Question 205-16 : The heaviest turbulence is likely to be encountered ?
Where the area of heaviest precipitation is closest to the edge of the thunderstorm cell
Question 205-17 : When using airborne weather radar in the mapping mode in polar areas one runs the risk ?
Of mistaking the edge of coastal ice off shore for the real coastline
Question 205-18 : The three main components of vor airborne equipment are ?
Receiver antenna display
Question 205-19 : The pictures at reference are showing an aircraft's position with respect to some thunderstorm cells and the image the pilot is getting from the radar to detect this 'blind alley' the pilot should . 2071 ?
Increase the range setting of his radar
Increase the range setting of his radar will permit to the pilot to see whether there is continued clear weather further
Question 205-20 : The 'gain' control knob of an awr airborne weather radar adjusts ?
The receiver sensitivity in order to achieve optimum target acquisition
Question 205-21 : Which statement is correct with respect to selections on the transponder control panel ?
With alt selected a reply in the modes a c and s can be transmitted
Admin .turn your transponder to the alt position it enables it to respond to mode a mode c and mode s interrogations even if you don't have an altitude encoder installed you should operate your transponder in the alt mode the reason for this is that the ground station is still looking for 'framing pulses' from your transponder even if there's no altitude information accompanying them
Question 205-22 : Echoes that do not change in distance from the antenna relative speed zero of a ground radar with a moving target indicator mti are dangerous for the following reason ?
The moving target indicator mti eliminates such echoes
Moving target indicator .mti makes use of doppler to eliminate returns from fixed objects such as hills or buildings the radar will only display returns that show a doppler shift i e moving targets but a target maintaining a constant range would not show up
Question 205-23 : Mode s.the allocation of 24 bit aircraft addresses is described in the icao annex 10 it states that ?
Every aircraft will have been allocated with an icao aircraft address which is hard coded into the airframe
Admin .icao annex 10 volume 3 communications systems .chapter 5 ssr mode s air ground data link.aircraft address a unique combination of 24 bits available for assignment to an aircraft for the purpose of air ground communications navigation and surveillance .chapter 9 aircraft addressing system.9 1 the aircraft address shall be one of 16 777 214 twenty four bit aircraft addresses allocated by icao to the state of registry or common mark registering authority and assigned as prescribed in the appendix to this chapter .appendix to chapter 9 a worldwide scheme for the allocation assignment and application of aircraft addresses.1 general.1 1 global communications navigation and surveillance systems shall use an individual aircraft address composed of 24 bits at any one time no address shall be assigned to more than one aircraft the assignment of aircraft addresses requires a comprehensive scheme providing for a balanced and expandable distribution of aircraft addresses applicable worldwide
Question 205-24 : Mode s.how does a ground interrogation signal mode a and c is transmitted to a transponder ?
In the form of pairs of interrogative pulses with an additional control pulse
Question 205-25 : The magnetic heading of an aircraft is 040° on the airborne weather radar display the relative bearing of and the distance to the most southerly part of lands end approximate position 50°03'n 005°40'w are 030°r and 80 nm .what is the position of the aircraft based on these observations . 2068 ?
49°25'n 007°30'w
Relative bearing = 040° + 030° = 070°.applied the variation 6°west on the chart so 070° 6° = 064°.064° + 180 ° = aircraft is on a bearing of 244° true from the station .now plot a position line 80 nm from the position 50°03'n 005°40'w .you are at position 49°25'n 007°30'w . 1695
Question 205-26 : The airborne weather radar ?
May receive no reflections from a thunderstorm in an area behind a heavy rain shower
Admin .the danger of the area behind heavy rain shadow area exists because no radar waves can penetrate deeply enough inside
Question 205-27 : The spacing between the two pulses transmitted by an ssr interrogator determines ?
What mode is used
Question 205-28 : When the atc transponder 'ident' button is pressed by the pilot ?
The airplane's symbol on the controller's display will flash or 'fill in'
Question 205-29 : On a typical computer generated ssr display the following data on a particular flight will be shown ?
Question 205-30 : In the ssr response the operation of the transponder 'ident' button ?
Sends a special pulse after the normal response pulse train
Question 205-31 : Which one of the following switch positions should be used when selecting a code on the transponder ?
Stby standby
Question 205-32 : In the ssr terminology 'de fruiting' means ?
The removal from the display of random responses
Question 205-33 : The selection of code 2000 on an aircraft ssr transponder indicates ?
Entry into airspace from an area where ssr operation has not been required
Question 205-34 : With ssr interrogation and response signals ?
Are standard frequencies separated by 60 mhz
Admin .ssr is fixed on 1030 mhz and 1090 mhz
Question 205-35 : Using ssr the normal transmission from the atc transponder in the aircraft consists of ?
The two pulses received plus an additional number of pulses between them
Question 205-36 : With regard to ssr ?
The interrogator is on the ground and transponder is in the aircraft
Question 205-37 : When a mode c check is carried out and assuming the equipment is working without error the mode c will report a pressure altitude of 35064 ft as ?
Fl351
.the altitude information sent with a transponder mode c is in hundreds of feet with an accuracy to + or 50 ft .35064 ft will be encoded as 351 35100 ft 35064 ft is round to the nearest hundred
Question 205-38 : In ssr the interrogations use different modes if altitude reporting is required the aeroplane's transponder should be set to 'alt' and will respond to ?
Mode c and a interrogations
Question 205-39 : The atc transponder system excluding mode s contains ?
Two modes each 4096 of codes
Question 205-40 : A mode s transponder ?
Responds normally to mode a or c interrogations
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