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Question 164-1 : Lenticular clouds in mountainous areas indicate ? [ Formation assignment ]

Turbulence

exemple 264 Turbulence.

Question 164-2 : Which of the following statements about lightnings and lightning strikes is correct ?

The aircraft is temporarily part of the lightning trajectory

exemple 268 The aircraft is temporarily part of the lightning trajectory.

Question 164-3 : Which of the following situations favours the formation of heavy thunderstorms ?

A cold front approaching a mountain range in the evening

exemple 272 A cold front approaching a mountain range in the evening.

Question 164-4 : With the development of a thunderstorm at what stage will there be only updraughts of air ?

Initial stage

exemple 276 Initial stage.

Question 164-5 : Where does wind shear occur ?

At any level in the atmosphere if associated with either a change of wind direction and/or wind speed

exemple 280 At any level in the atmosphere if associated with either a change of wind direction and/or wind speed.

Question 164-6 : When severe mountain waves are present where would the area of most severe turbulence be located ?

In the rotor zone

Admin .the turbulence associated with a mountain wave is in the rotor zone . 610 exemple 284 In the rotor zone.

Question 164-7 : Taf lszh 250600z 250716 00000kt 0100 fg vv001 becmg 0810 0800 vv002 becmg 1012 23005kt 2500 br bkn005 tempo 1316 6000 sct007 =.which of these statements best describes the weather that can be expected at 1200 utc ?

Visibility 2 5 kilometres mist cloud base 500 feet wind speed 5 knots

exemple 288 Visibility 2,5 kilometres, mist, cloud base 500 feet, wind speed 5 knots

Question 164-8 : Which statement is correct for microbursts ?

The diameter of the affected area on the surface does not exceed 4 km

Admin .a microburst/downburst is a localized area of damaging winds caused by air rapidly flowing down and out of a thunderstorm a microburst occurs when cold air high in a thunderstorm descends and accelerates as the stream of cold air reaches the ground it spreads out and can accelerate even further exemple 292 The diameter of the affected area on the surface does not exceed 4 km.

Question 164-9 : Which statement does correspond to the definition of severe turbulence ?

Aircraft may be out of control for short periods occupants are forced violently against seat belts loose objects are tossed about

Admin .moderate conditions in which moderate changes in aircraft attitude and/or altitude may occur but the aircraft remains in positive control at all times usually small variations in airspeed changes in accelerometer readings of 0 5 g to 1 0 g at the aircraft's centre of gravity difficulty in walking occupants feel strain against seat belts loose objects move about .severe conditions in which abrupt changes in aircraft attitude and/or altitude occur aircraft may be out of control for short periods usually large variations in airspeed changes in accelerometer readings greater than 1 0 g at the aircraft's centre of gravity occupants are forced violently against seat belts loose objects are tossed about exemple 296 Aircraft may be out of control for short periods, occupants are forced violently against seat belts, loose objects are tossed about.

Question 164-10 : What is the lowest visibility forecast for approach into geneva eta 1200 utc .taf lsgg 020900z 021019 18007kt 9999 sct020 bkn100 becmg 1114 8000 ra sct010 ovc020 prob30 tempo 1018 vrb10g25kt tsra sct005 bkn015cb= ?

8 km

exemple 300 8 km.

Question 164-11 : Which thunderstorms generally produce the most severe conditions such as heavy hail and destructive winds ?

Squall line thunderstorms

Admin .when many individual thunderstorms organize into a nearly continuous line a squall line is born they can be more than 80 nm long and often form 40 to 130 nm ahead of advancing cold fronts racing along squall line thunderstorms blast the ground with torrents of rain and hail driven by winds gusting higher than 50 kt exemple 304 Squall line thunderstorms.

Question 164-12 : What visibility is most likely to be experienced during an approach into madrid at 2300 utc .taf lemd 281200z 281812 13005kt cavok tempo 1821 8000 sct020 sct030 becmg 2123 21005kt 9999 sct015 bkn080 prob40 tempo 2306 6000 sct008 ?

10 kilometres or more

Admin .the tempo group is used for any conditions in wind visibility weather or sky condition which are expected to last for generally less than an hour at a time occasional and are expected to occur during less than half the time period the tempo indicator is followed by a four digit group giving the beginning hour and ending hour of the time period during which the temporary conditions are expected only the changing forecast meteorological conditions are included in tempo groups the omitted conditions are carried over from the previous time group .thus the most likely visibility to be experienced during an approach into madrid at 2300 utc is 10 kilometres or more exemple 308 10 kilometres or more.

Question 164-13 : What is the lowest visibility that may be expected during an approach into dhahran at eta 0600 utc .taf oedr 280000z 280110 vrb08kt cavok becmg 0103 7000 tempo 0410 28014g24kt 4000 sa= ?

4 km

exemple 312 4 km.

Question 164-14 : In which squares are conditions most likely to cause the occurrence of low level wind shear . 329 ?

3 a and 3 c

exemple 316 3 a and 3 c.

Question 164-15 : For an aircraft making an approach to an airfield which is not situated near high ground in the vicinity of the active front in square 3 b a potential hazard exists in the form of . 346 ?

Low level wind shear

exemple 320 Low level wind shear.

Question 164-16 : The occurrence of freezing rain at fl 60 is most likely in square . 347 ?

3c

Admin .at fl 60 in square 3c the aircraft will be at the cold air freezing level and this would be the most likely area to encounter freezing rain . 505.freezing rain is associated with warm fronts and warm occlusions in a warm front the freezing level is lower than behind in the warm sector and the slope means that freezing rain will be falling on anything underneath .in square 2a and 2d you are above fl 70 exemple 324 3c.

Question 164-17 : For an aircraft at fl 40 approaching the front square 3c from the direction of square 3d a potential hazard exists before reaching the front in the form of . 351 ?

Clear ice accretion to the airframe

Admin .at fl 40 the aircraft will be close to the cold air freezing level and this would be the most likely area to encounter freezing rain . 505.freezing rain is associated with warm fronts and warm occlusions in a warm front the freezing level is lower than behind in the warm sector and the slope means that freezing rain will be falling on anything underneath exemple 328 Clear ice accretion to the airframe.

Question 164-18 : What are the characteristics of rime ice and what conditions are most favourable for its formation ?

Milky granular appearance forming on leading edges and accumulating forward into the air stream stratiform clouds at temperatures of 10°c to 20°c are most conducive to its formation

exemple 332 Milky granular appearance, forming on leading edges and accumulating forward into the air stream. stratiform clouds at temperatures of -10°c to -20°c are most conducive to its formation.

Question 164-19 : What intensity and type of aircraft icing is likely to occur at fl 100 in a thunderstorm with the freezing level at 7000 ft ?

Moderate to severe icing due to clear ice

Admin .ice will form on an airplane if there is water in a liquid state combined with either the air or the airframe temperature below 0° .large supercooled water droplets are found between 0° and 10°c wich is our case with a freezing level at 7000ft at fl100 we have 6°c when such large droplets strike the airframe just few degrees below zero they flow back turning into clear ice .clear ice is transparent with no trapped air so it is very hard to get rid of it is found most often in cumulus clouds and unstable conditions thunderstorms it is the most dangerous form of aircraft icing and in a thunderstorm risk is moderate to severe exemple 336 Moderate to severe icing due to clear ice.

Question 164-20 : The presence of ice pellets at the surface is the evidence that ?

Temperatures are above freezing at some higher altitudes

exemple 340 Temperatures are above freezing at some higher altitudes.

Question 164-21 : At the surface the lifetime of a typical microburst and the diameter of the area affected by damaging winds are in the order of ?

1 5 minutes and 4 km

Admin .a microburst/downburst is a localized area of damaging winds caused by air rapidly flowing down and out of a thunderstorm a microburst occurs when cold air high in a thunderstorm descends and accelerates as the stream of cold air reaches the ground it spreads out and can accelerate even further exemple 344 1-5 minutes and 4 km.

Question 164-22 : In mature cb's the probability of severe icing according to meteorological rules is greatest in the following temperature range ?

0°c to 23°c

exemple 348 0°c to -23°c.

Question 164-23 : In which environment is aircraft structural ice most likely to have the highest accumulation rate ?

Freezing rain

exemple 352 Freezing rain.

Question 164-24 : An aircraft descends in layered clouds the freezing level is situated at fl 60 .at what levels is the probability for airframe icing the highest ?

Between fl 120 and fl 60

Admin .the probability for airframe icing is the highest for temperatures just below 0°c if the freezing level is at fl60 from fl60 to fl120 the temperature decreases from 0°c to 12°c exemple 356 Between fl 120 and fl 60.

Question 164-25 : According to icao which symbol indicates danger to an aircraft flying according to instrument flight rules ifr . 363 ?

Symbol 2

Admin . 629.drizzle widespread mist and rain are not considered as danger exemple 360 Symbol 2.

Question 164-26 : In which of the following situations is the probability for severe thunderstorms the highest ?

Advection of maritime cold air over a warm sea surface

Admin .maritime cold air means 'moist air' over a warm surface this cold air will be heated by convection lower layer will rise and increase instability this will lead to the formation of cumulonimbus with possible severe thunderstorms exemple 364 Advection of maritime cold air over a warm sea surface.

Question 164-27 : In which of these cloud types can icing be virtually ruled out ?

Cs

exemple 368 Cs

Question 164-28 : According to icao which symbol indicates danger to an aircraft flying according to instrument flight rules ifr . 371 ?

Symbol 3

Admin . 629 exemple 372 Symbol 3.

Question 164-29 : In which conditions would you most likely encounter clear icing and how would it normally appear ?

Cumuliform clouds large water droplets temperatures between 0°c and 15°c appears smooth and tends to spread back over an aircraft wing

exemple 376 Cumuliform clouds, large water droplets, temperatures between 0°c and -15°c. appears smooth and tends to spread back over an aircraft wing.

Question 164-30 : A cb with thunderstorm has reached the mature stage which statement is correct ?

In temperatures lower than 23°c icing is still possible

Initial stage updrafts.mature stage updrafts and downdrafts.dissipating stage downdrafts .hail can occur in downdrafts and updrafts .you will have severe turbulence in the cloud and below .the freezing level remains almost the same in an outside the cloud .with temperatures lower than 23°c icing is still possible since some lifted water droplets are at positive temperatures exemple 380 In temperatures lower than -23°c icing is still possible.

Question 164-31 : Which of the following statements is true with regard to mountain waves ?

Flight with headwind toward high ground is likely to be more hazardous than flight with tailwind toward high ground

Admin . 634.headwind implies that you are flying towards the ridge and while approaching the ridge you are most likely to encounter violent downdraught and rotors exemple 384 Flight with headwind toward high ground is likely to be more hazardous than flight with tailwind toward high ground.

Question 164-32 : The correct statement is ?

Airframe icing can occur in clear air

Admin .light airframe icing can occur in clean air .haze is a reduction of visibility due to the presence of dust particles .rotor clouds depend on mountain waves intensity and moisture of the air mass .some cb can extend above the tropopause thus you can encounter turbulence above them exemple 388 Airframe icing can occur in clear air.

Question 164-33 : Flight from bordeaux to amsterdam eta 2100 utc what is the minimum visibility forecast for eta amsterdam .taf eham 281500z 281601 14010kt 6000 ra sct025 becmg 1618 12015g25kt sct008 bkn013 tempo 1823 3000 ra bkn005 ovc010 becmg 2301 25020kt 8000 nsw bkn020 = ?

3 km

exemple 392 3 km.

Question 164-34 : What are the conditions required for the formation of hoar frost ?

The temperature of the surface is lower than the dew point of the air and the dew point is lower than 0°c

Admin .when the surface temperature is lower than the dew point air in contact with the surface will be saturated since the dew point is below 0°c the water vapour will skip the liquid stage and form ice crystals on the cold surface which is called hoar frost exemple 396 The temperature of the surface is lower than the dew point of the air and the dew point is lower than 0°c.

Question 164-35 : Imagine an airfield during summer with sunny days and clear nights and with a runway parallel to the shoreline of a large inland lake 5 nautical miles away from the field .a small aircraft heading for the airfield in the afternoon experiences wind shear during approach and a cross wind component ?

A strong sea breeze blowing more or less perpendicular to the runway

exemple 400 A strong sea breeze blowing more or less perpendicular to the runway.

Question 164-36 : Which of the following situations favours the formation of heavy thunderstorms ?

A cold front approaching a mountain range in the evening

Cqb15 august 2011 exemple 404 A cold front approaching a mountain range in the evening.

Question 164-37 : The wind at 500ft above ground is 290/15kt and at the same position at 600ft above ground 300/22kt .how is this wind situation called ?

Moderate vertical wind shear

Cqb15 august 2011 exemple 408 Moderate vertical wind shear.

Question 164-38 : Imagine an aircraft during approach to an airfield which is located in a basin within mountainous area under the influence of a blocking anticyclone in winter the most correct statement given below is ?

While approaching the airfield in the early morning after a short period of bumpiness the engines of the aircraft will deliver more thrust after breaking through the inversion layer if the pilot does not intervene

Cqb15 august 2011 exemple 412 While approaching the airfield in the early morning, after a short period of bumpiness the engines of the aircraft will deliver more thrust after breaking through the inversion layer if the pilot does not intervene.

Question 164-39 : Mark the statement most reasonable regarding a valley inversion ?

Over night cool dense air as a result of radiation cooling will descend along the mountain slopes into the basin and lead to the development of a valley inversion

Cqb15 september 2011 exemple 416 Over night, cool dense air as a result of radiation cooling will descend along the mountain slopes into the basin and lead to the development of a valley inversion.

Question 164-40 : Which of the following statements is correct concerning the weather in a warm sector ?

Isolated thunderstorms are sometimes possible over continental areas during the summer

Cqb 15 october 2011 exemple 420 Isolated thunderstorms are sometimes possible over continental areas during the summer.


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