Un compte Premium offert sur le site FCL.055 ! Rendez-vous sur www.fcl055-exam.fr puis créez un compte avec le même email que celui...   [Lire la suite]


Question 140-1 : Before landing an altimeter set to qfe indicates ? [ Certification weather ]

In standard atmosphere the height of the aircraft above the official airport elevation

Admin .qfe is a 'q code' used by pilots and air traffic control to refer to the barometric altimeter setting which will cause an altimeter to read height above a particular runway threshold .an altimeter set to qfe will therefore read zero when on the ground at the beginning of the runway .this setting may be used during take off and landing and when flying in the circuit a mnemonic for the code is 'q field elevation' exemple 240 In standard atmosphere, the height of the aircraft above the official airport elevation.

Question 140-2 : In the mid latitudes the stratosphere extends on an average from ?

11 to 50 km

exemple 244 11 to 50 km.

Question 140-3 : An aircraft maintains a constant indicated altitude of 4500 ft from a 360 ft/amsl qnh 986 hpa to b 690 ft/amsl qnh 1011 hpa .assuming that the altimeter subscale setting remains unchanged at 986 hpa the actual height of the aircraft above the surface at b will be ?

4485 ft

The altimeter subscale setting remains unchanged at 986 hpa ..difference at b 1011 986 = 25 hpa x 27 ft = 675 ft..4500 ft 690 ft = 3810 ft..actual height of the aircraft above the surface at b will be .3810 ft + 675 ft = 4485 ft . gargameleatpl .alt elevation = height so correct answer is 3810 675= 3135 ..you should take a break .3135 ft is your corret answer but if we provide an other answer and an explanation it might be for a reason .when you will be over b with a subscale setting of 986 hpa you gonna turn the selection knob in a counterclockwise direction to set 1011 hpa the indicated altitude will then increased by 25 hpa x 27 ft = 675 ft .4500 ft over b + 675 ft = 5175 ft .b elevation is 690 ft thus actual height of the aircraft above the surface at b will be 5175 690 = 4485 ft exemple 248 4485 ft.

Question 140-4 : An aircraft maintains a constant indicated altitude of 5500 ft from a 1050 ft/amsl qnh 968 hpa to b 650 ft/amsl qnh 1016 hpa .assuming that the altimeter subscale setting remains unchanged at 968 hpa the actual height of the aircraft above the surface at b will be ?

6146 ft

Admin .the altimeter subscale setting remains unchanged at 968 hpa .difference at b 1016 968 = 48 hpa x 27 ft = 1296 ft.5500 ft 650 ft = 4850 ft.actual height of the aircraft above the surface at b will be .4850 ft + 1296 ft = 6146 ft exemple 252 6146 ft.

Question 140-5 : An aircraft maintains a constant indicated altitude of 6500 ft from a 600 ft/amsl qnh 1012 hpa to b 930 ft/amsl qnh 977 hpa .assuming that the altimeter subscale setting remains unchanged at 1012 hpa the actual height of the aircraft above the surface at b will be ?

4625 ft

Admin .the altimeter subscale setting remains unchanged at 1012 hpa .difference at b 977 1012 = 35 hpa x 27 ft = 945 ft.6500 ft 945 ft = 5570 ft.actual height of the aircraft above the surface at b will be .5570 ft 945 ft = 4625 ft exemple 256 4625 ft.

Question 140-6 : An aircraft maintains a constant indicated altitude of 7500 ft from a 270 ft/amsl qnh 1021 hpa to b 1650 ft/amsl qnh 983 hpa .the altimeter sub scale setting remains unchanged at 1021 hpa the actual height of the aircraft above the surface at b will be ?

4824 ft

Admin .the altimeter subscale setting remains unchanged at 1021 hpa .difference at b 983 1021 = 38 hpa x 27 ft = 1026 ft.7500 ft 1650 ft = 5850 ft.actual height of the aircraft above the surface at b will be .5850 ft 1026 ft = 4824 ft .dadoki .for better and logical understanding .you've got 1021hpa set on the altimeter when you arrive at position b you realize to change your altimeter height and set it to 983 hpa .to do it of course you turn anticlockwise the knob and height is decreasing on your altimeter altimeter went down about 1026 ft because you've just turned the knob anticlockwise downwards .so you get 6474 ft 7500 1026 and to adjust it to the elevation of the point b you subtract the elevation so 6474 1650 = 4824ft . if you have a situation where point a has a lower qnh like 970 hpa and you will get at the point with higher qnh like 1020 hpa so you are about to turn the knob clockwise or upwards to get the height in this case the difference is 50 hpa and therefore 50 x 27 = 1350 ft and then you just add this difference and again subtract the elevation of the point b or present point exemple 260 4824 ft.

Question 140-7 : Between mean sea level and a height of 20 km the lowest temperature in the icao standard atmosphere isa is ?

56 5°c

exemple 264 -56.5°c.

Question 140-8 : Considering the north atlantic area north of 60°n during winter the mean height of the tropopause is approximately ?

29 000 ft

Admin .the tropopause is at the top of the troposphere it marks the boundary between the troposphere and the next atmospheric layer the stratosphere the tropopause is defined as being that part of the atmosphere where temperature no longer decreases with height . 491.29000 ft is approximately 9 km .the average height of the tropopause over the equator is 16 km and 8 km over the poles at 60°n the mean height of the tropopause is approximately 29 000 ft exemple 268 29 000 ft.

Question 140-9 : Considering the north atlantic at latitude 50°n during winter the mean height of the tropopause is approximately ?

31 000 ft

Admin .the tropopause is at the top of the troposphere it marks the boundary between the troposphere and the next atmospheric layer the stratosphere the tropopause is defined as being that part of the atmosphere where temperature no longer decreases with height . 491.31 000 ft is approximately 9 5 km .the average height of the tropopause over the equator is 16 km and 8 km over the poles at 50°n the mean height of the tropopause is approximately 31 000 ft exemple 272 31 000 ft.

Question 140-10 : If the qfe qnh and qff of an airport have the same value ?

The airport must be at msl

Admin .qfe qnh and qff will all be at the same pressure for having the same value and it can occur only if the airport is at msl .temperature or pressure can differ from isa at msl there is no incidence exemple 276 The airport must be at msl.

Question 140-11 : In relation to the total weight of the atmosphere the weight of the atmosphere between mean sea level and a height of 5500 m is ?

50%

Admin .50% of the atmosphere by mass is below an altitude of 5500 m .90% of the atmosphere by mass is below an altitude of 16 km .99 99997% of the atmosphere by mass is below 100 km exemple 280 50%.

Question 140-12 : The icao standard atmosphere isa assumes that temperature will reduce at the rate of ?

1 98°c per 1000 ft up to 36090 ft after which it remains constant to 65617 ft

exemple 284 1,98°c per 1000 ft up to 36090 ft after which it remains constant to 65617 ft.

Question 140-13 : With all other quantities being constant the density of the atmosphere increases with increasing ?

Air pressure

.density depends on pressure and temperature .density is proportional to air pressure and inversely proportional to temperature exemple 288 Air pressure.

Question 140-14 : You are flying over the sea at fl 250 and measure an outside temperature of 50°c the pressure at sea level is 1023 hpa .what is your approximate true altitude calculated using normal vertical change in temperature with increase in height ?

23770 ft/amsl

The following rules shall be considered for altimetry calculations . the value for the barometric lapse rate near mean sea level is 27 ft 8 m per 1 hpa . to determine the true altitude/height the following rule of thumb called the '4% rule' shall be used the altitude/height changes by 4% for each 10°c temperature deviation from isa ..1023 1013 = 10 hpa..10 x 27 = 270 ft..25000 ft + 270 ft = 25270 ft ..altitude/height changes by 4% for each 10°c temperature deviation from isa.temperature correction = 4 x 25 27 x 15.temperature correction is minus 1516 2 ft since air is colder than isa and we are looking for our true altitude our altimeter remains at fl250 setting 1013 .our approximate true altitude 25270 1516 = 23754 ft .close enough to the result desired exemple 292 23770 ft/amsl.

Question 140-15 : You are flying at fl 200 .outside air temperature is 40°c and the pressure at sea level is 1033 hpa.what is the true altitude ?

19310 ft

Admin .1033 1013 = 20 hpa x 27 ft = 540 ft .in isa conditions altitude is 20540 ft and oat will be .15°c 2°c x 20 = 25°c .oat is 40°c to determine the true altitude/height the following rule of thumb called the '4% rule' shall be used the altitude/height changes by 4% for each 10°c temperature deviation from isa .4% x 20 54 x 15 = 1232 ft .20540 1232 = 19308 ft . minus 1232 ft because the air mass is colder than isa exemple 296 19310 ft.

Question 140-16 : You are flying at fl 160 .outside air temperature is 27°c and the pressure at sea level is 1003 hpa .what is the true altitude ?

15100 ft

Admin .1013 1003 = 10 hpa x 27 ft = 270 ft .in isa conditions altitude is 15730 ft and oat will be .15°c 2°c x 16 = 17°c .oat is 27°c to determine the true altitude/height the following rule of thumb called the '4% rule' shall be used the altitude/height changes by 4% for each 10°c temperature deviation from isa .4% x 15 73 x 10 = 629 ft .15730 629 = 15101 ft . minus 629 ft because the air mass is colder than isa exemple 300 15100 ft.

Question 140-17 : Which statement concerning the tropopause is correct ?

The layer just above the tropopause is absolutely stable

Admin . 633.the layer just above the tropopause is absolutely stable from 12 km to 25 km the temperature does not vary with height it is an isothermal layer where we have absolute stability .note the icao standard atmosphere does not state that the tropopause has different heights around the earth tropopause is constant at 11 km for icao exemple 304 The layer just above the tropopause is absolutely stable.

Question 140-18 : Pressure altitude is obtained by ?

Setting the altimeter to standard sea level pressure

Admin .1013 25 hpa is the isa mean sea level pressure also known as 'standard pressure setting' .in non isa conditions the 1013 25 hpa pressure level will be above or below mean sea level the standard pressure setting is used as an altimeter setting above the transition altitude exemple 308 Setting the altimeter to standard sea level pressure.

Question 140-19 : What is approximately the temperature at 20000 ft in the icao standard atmosphere ?

25°c

Admin .the icao standard atmosphere isa assumes that temperature will reduce at the rate of 1 98°c per 1000 ft up to 36090 ft after which it remains constant to 65617 ft .the icao standard atmosphere isa also states 'at msl temperature is 15°c and pressure is 1013 25 hpa' .for calculation we will assume a cooling rate of 2° per 1000 ft .15°c 20 x 2°c = 25°c exemple 312 -25°c.

Question 140-20 : What is the most probable temperature at the tropical tropopause ?

75°c

Admin .the tropopause is at the top of the troposphere it marks the boundary between the troposphere and the next atmospheric layer the stratosphere the tropopause is defined as being that part of the atmosphere where temperature no longer decreases with height .the temperature at the tropopause can be as high as 40°c over the poles and as low as 80°c over the equator the average height of the tropopause is at about 11 km where its temperature is 56 5°c .above tropical regions 15° 30° n and s the most probable temperature is 75°c exemple 316 -75°c.

Question 140-21 : What is the average temperature difference from isa at fl 300 between edinburgh and madrid . 339 ?

2°c

Admin .from edinburg to madrid at fl300 temperatures are . 49 + 48 + 47 + 47 + 46 + 46 + 47 /7 = 47°c .isa temperature at fl300 is 15º 2º x 30 = 45ºc .average oat outside air temperature is 2°c colder than isa exemple 320 -2°c.

Question 140-22 : Considering the route between valencia and charleston at fl 340 the forecast mean temperature is . 342 ?

50°c

Admin .at fl340 between valencia and charleston average temperature is around 50°c .pick up some temperatures close to the track . 616. 48+56+50+50+45+50+46+48+57 /9 = 50°c minus 50°c exemple 324 -50°c

Question 140-23 : The temperature lapse rate of the standard atmosphere in the troposphere is ?

2°c/1000 ft

exemple 328 2°c/1000 ft.

Question 140-24 : The radiosonde can directly measure ?

Atmospheric pressure air temperature humidity

Admin .pressure temperature and humidity are measured using three capacitative sensors a radiosonde 'sonde' is french for probe is a unit for use in weather balloons that measures various atmospheric parameters and transmits them to a fixed receiver .wind speed and direction are not directly measured by the radiosonde wind speed and direction can be determined from additional windfinding equipment these parameters are calculated from the position of the sonde at successive time intervals exemple 332 Atmospheric pressure, air temperature, humidity.

Question 140-25 : Flight from lisbon lppt to kingston mkjp at 40°n 20°w the temperature deviation from isa at fl 390 is . 2534 ?

0°c

Admin . 624. 56 7 is considered to be the lowest isa temperature so temperature deviation from isa at fl 390 is 0° exemple 336 0°c.

Question 140-26 : At which pressure and temperature conditions may you safely assume that the minimum usable flight level at least lies at the same height as the minimum safe altitude ?

At a temperature greater than or equal to that of the isa and where the qnh is greater than or equal to 1013 25 hpa

Admin .if the qnh is more than 1013 25 hpa our true altitude will be more than our pressure altitude flight level .example qnh 1023 fl 100 pressure altitude 10000 ft our true altitude will be approximately 10300 ft .also if it is warmer than isa our true altitude will be higher than our indicated altitude exemple 340 At a temperature greater than or equal to that of the isa and where the qnh is greater than or equal to 1013.25 hpa.

Question 140-27 : Given .altimeter setting 1013 2 hpa.altimeter reading 5000 ft.outside air temperature at 5000 ft +5°c.qfe 958 hpa.qnh 983 hpa.what is the true height of the aeroplane above the aerodrome ?

3515 ft

Admin .1013 958 = 55 hpa.55 hpa x 27 = 1485 ft .isa temperature at 5000 ft .15°c 2°c x 5 = +5°c oat = isa so we are in isa conditions .5000 1485 = 3515 ft .you are flying at fl50 subscale setting 1013 15 hpa you turn counterclockwise your subscale setting knob until the scale reads 958 hpa .indicated altitude will decrease by 55 ft x 27 ft = 1485 ft and becomes a true height since the subscale scale is qfe qfe indicates the height of the aircraft above the aerodrome in standard atmosphere .to find the answer you must do .5000 675 810 = 3515 .675 is difference between the ground and msl qnh .810 is difference between the msl and fl exemple 344 3515 ft.

Question 140-28 : At fl 180 the air temperature is 35°c the air density at this level is ?

Greater than the density of the isa at fl 180

Admin .at fl180 the isa deviation is 14ºc which is obviously colder .heating reduces density volume is greater a parcel of the air expands .cooling increases density volume is lower a parcel of the air shrinks .final statement density is inversely proportional to temperature . so if it's colder density is higher if it's hotter density is lower exemple 348 Greater than the density of the isa at fl 180.

Question 140-29 : An aircraft flies at flight level 40 elevation of the aerodrome 990 ft and qnh 976 hpa the tower clears the pilot to fly at 3000 ft qnh .which of the following statements is correct ?

Only a small change of altitude is necessary

Admin .you are flying at fl 40 with a subscale of 1013 hpa .at 990 ft qnh is 976 hpa .difference between 1013 and 976 is 37 hpa .37 hpa x 27 ft = 999 ft .while flying at fl40 at 1013hpa setting you are in reality at 4000 999 = 3001 ft for a 976 hpa subscale setting .the tower clears the pilot to fly at 3000 ft qnh he has to descend 1 ft to reach 3000 ft at 976 hpa exemple 352 Only a small change of altitude is necessary.

Question 140-30 : The mean temperature that may be expected to affect that segment of the route from the coast of se england to geneva at fl 270 is ?

38°c

Be careful we are looking at the temperature only for the part from the coast of se england to geneva not from dublin to tunis .over manche at fl240 temperature is 35° .before geneva at fl240 temperature is 30° ..over manche at fl300 temperature is 48° .before geneva at fl300 temperature is 44° ..average temperature at fl240 = 35° + 30° /2 = 32 5°c .average temperature at fl300 = 48° + 44° /2 = 46°c ..average temperature at fl270 = 32 5° + 46° /2 = 39°c exemple 356 -38°c.

Question 140-31 : Flight from lisbon lppt to kingston mkjp considering the route segment between 60°w and 70°w at fl 390 the forecast mean temperature is . 368 ?

55°c

Admin . 631.we are only looking for the mean temperature forecast between 60°w and 70°w exemple 360 -55°c.

Question 140-32 : What is the average temperature difference from isa at fl 390 between madrid and dhahran . 370 ?

1°c

The lowest temperature in the icao standard atmosphere isa is 56 5°c .average temperature between madrid and dhahran is around 57°c this is about 1°c colder exemple 364 -1°c

Question 140-33 : The diurnal variation in temperature is largest when ?

The sky is clear and the wind is weak

exemple 368 The sky is clear and the wind is weak

Question 140-34 : Which of the following statements concerning the tropopause is correct ?

The temperature lapse rate changes abruptly at the tropopause

Admin . 633.at the tropopause the temperature remains constant until 25 km then it increases .the lapse rate changes abruptly at the tropopause exemple 372 The temperature lapse rate changes abruptly at the tropopause.

Question 140-35 : An aircraft is flying through the alps on a very cold winter's day the regional qnh is 1013 hpa .during the flight you circle around a mountain at an altitude of its summit .what reading will the aneroid altimeter give compared to the elevation of the summit ?

A higher altitude than the elevation of the summit

Admin .on a very cold winter's day means an outside temperature well below isa temperature if the summit is at 10000 ft you will normally read an altitude of 10000 ft in standard atmosphere .since outside temperature is well below isa temperature the air mass is contracted your altimeter will read a higher altitude than the elevation of the summit exemple 376 A higher altitude than the elevation of the summit.

Question 140-36 : An aircraft is flying through the alps on a warm summer's day the weather is fine and there is a high pressure system in the area .during the flight a mountain is passed at an altitude of its summit .what reading will the aneroid altimeter give compared to the summit's elevation ?

A lower altitude than the elevation of the summit

Admin .if the summit's elevation is 10000 ft and the aircraft is at a real height of 10000 ft with high temperature the altimeter under read the aircraft's altitude and it reads a lower altitude than the elevation of the summit .if now you fly at an indicated altitude of 10000 ft you will pass largely over the summit's elevation .if you fly imc and having to pass over this summit with a 1000 ft margin in cold days you must be at a higher indicated altitude than 11000 ft to be 'in reality' at or above 11000 ft exemple 380 A lower altitude than the elevation of the summit.

Question 140-37 : What is the approximate vertical interval which is equal to a pressure change of 1 hpa at sea level ?

8 m 27 ft

Cqb15 july 2011 exemple 384 8 m (27 ft).

Question 140-38 : On a route segment from a to b the highest terrain elevation is approximately 200 feet for an instrument flight the minimum obstacle clearance is 1000 feet the subscale of the altimeter is set to the local qnh of 1013 hpa and the temperature on the ground is 5°c assume a standard temperature lapse ?

1300 feet

Admin .we actually need to fly at 1000 + 200 = 1200 ft .temperature at 200 ft or 0 ft it's not a big deal is 5°c .temperature is colder than isa our altimeter must read an altitude higher than 1200 ft to be sure not to be lower than 1200 ft .isa temperature at 1000 ft is 13°c today it is 7°c we 'lose' 2° per 1000 ft .difference between isa is 20°c .altitude/height changes by 4% for each 10°c temperature deviation from isa.temperature correction = 4 x 1 2 x 20 temperature correction = 96 ft .our altimeter must read at least 1296 ft and we will really fly over the mountain at 1200 ft .answer 1300 ft is our minimum acceptable altimeter indication exemple 388 1300 feet.

Question 140-39 : An aircraft is flying from point a to point b at the flight level corresponding to the pressure surface of the constant pressure chart .which of the following statements is correct . 376 ?

Wind speed over b is higher than over a

Admin .if you stand with your back to the wind in the northern hemisphere low pressure is on your left buys ballot's law .with a wind coming from the west direction and you stand with your back to it low pressure is on your left . 542.on the annex a is on a higher contour line than b true altitude will be higher at a and over london than at b .isobars are tighter at b than a so wind speed over b is higher than over a exemple 392 Wind speed over b is higher than over a.

Question 140-40 : Which of the following constant pressure charts would be most relevant for planning a flight at fl 430 ?

150 hpa

There is a few questions in the exam that take information directly from that table below write these down on a sticky and have them on the wall beside you .1013 hpa = msl.850 hpa = fl50.700 hpa = fl100.500 hpa = fl180.300 hpa = fl300.200 hpa = fl390..any others you can interpolate between these and figure it out .the decrease of 1hpa/27ft is only applicable at the lower levels of the troposphere as you go up and air pressure decreases the change of height per 1 hpa increases at msl 1hpa/27ft at fl180 it's 50ft/hpa and at fl390 it's 105ft/hpa exemple 396 150 hpa.


~

Exclusive rights reserved. Reproduction prohibited under penalty of prosecution.

5559 Free Training Exam