Which fl corresponds with the 200 hpa pressure level ? [ Revision flight ]

Question 137-1 : Fl 390 fl 300 fl 50 fl 100

exemple 237 Fl 390. — Admin .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 Fl 390.

What is the approximate vertical interval which is equal to a pressure change ?

Question 137-2 : 15 m 50 ft 8 m 27 ft 32 m 105 ft 64 m 210 ft

V.the decrease of 1 hpa/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 1 hpa/27ft at fl180 it's 50 ft/hpa and at fl390 it's 105 ft/hpa .fl180 = 18000 ft = approximately 5500 m

The temperature at fl 140 is 12°c what will the temperature be at fl 110 if ?

Question 137-3 : 6°c 18°c 9°c 15°c

exemple 245 -6°c. — Admin .the temperature lapse rates of the troposphere is mean value 0 65°c/100 m or 2°c/1000 ft .in isa temperature at fl140 should be 15° 2x14 = 13°c .as the current temperature at that level is 12°c you can say that at fl140 it is currently isa+1 .therefore at fl110 15° 2x11 = 7°c +1 from isa+1 = 6°c -6°c.

If atmospheric conditions exist such that the temperature deviation is isa ?

Question 137-4 : 6240 ft 6000 ft 5900 ft 5760 ft

Admin .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 ..the air mass is hotter than isa density is lower and layer must be thicker than 6000 ft .4% x 1 x 6000 = 240 ft .6000 + 240 = 6240 ft

How does the height of the tropopause normally vary with latitude in the ?

Question 137-5 : It decreases from south to north it remains constant from north to south it remains constant throughout the year it increases from south to north

exemple 253 It decreases from south to north. — Admin . 491.n the northern hemisphere the tropopause decreases from south to north .in the southern hemisphere it decreases from north to south It decreases from south to north.

What approximately is the average height of the tropopause over the equator ?

Question 137-6 : 16 km 40 km 8 km 11 km

exemple 257 16 km. — Admin . 491.16 km is approximately the average height of the tropopause over the equator 16 km.

In which layer is most of the atmospheric humidity concentrated ?

Question 137-7 : Troposphere tropopause stratopause stratosphere

exemple 261 Troposphere. — Admin . 633 Troposphere.

Under what condition does pressure altitude have the same value as density ?

Question 137-8 : At standard temperature when the altimeter has no position error at sea level when the temperature is 0°c when the altimeter setting is 1013 2 hpa

exemple 265 At standard temperature. — Admin .density altitude is the altitude in the isa at which the current observed density would occur density altitude is only the same as pressure altitude in standard atmosphere conditions .density altitude can be calculated by adjusting the pressure altitude for non standard temperature At standard temperature.

In the troposphere the decrease of pressure per 100 m increase in height ?

Question 137-9 : Is smaller at higher levels than at lower levels remains constant at all levels is greater at higher levels than at lower levels is in the order of 27 hpa near msl

exemple 269 Is smaller at higher levels than at lower levels. — Admin .the decrease of 1 hpa/27 ft 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 .100 m = 328 ft .at mean sea level 328 ft / 27 is equal to a pressure change of 12 2 hpa .a 39000 ft 328 ft / 105 is equal to a pressure change of 3 1 hpa .the decrease of pressure per 100 m 328 ft increase in height is smaller at higher levels than at lower levels Is smaller at higher levels than at lower levels.

In a situation with a weak pressure gradient and no thunderstorms around what ?

Question 137-10 : Apparently nothing because any changes would be small increase rapidly show strong fluctuations decrease rapidly

exemple 273 Apparently nothing, because any changes would be small. — Apparently nothing, because any changes would be small.

What pressure is defined as qfe ?

Question 137-11 : The pressure at field elevation the pressure of the altimeter the pressure reduced to sea level using actual temperatures the pressure reduced to sea level using isa temperatures

exemple 277 The pressure at field elevation — The pressure at field elevation

What is the approximate composition of the dry air by volume in the troposphere ?

Question 137-12 : 21% oxygen 78% nitrogen and the rest other gasses 10% oxygen 89% nitrogen and the rest other gasses 88% oxygen 9% nitrogen and the rest other gasses 50% oxygen 40% nitrogen and the rest other gasses

exemple 281 21% oxygen, 78% nitrogen, and the rest other gasses. — 21% oxygen, 78% nitrogen, and the rest other gasses.

How does temperature vary with increasing altitude in the icao standard ?

Question 137-13 : Decreases increases at first it increases and higher up it decreases remains constant

What is the boundary layer between troposphere and stratosphere called ?

Question 137-14 : Tropopause ionosphere stratosphere atmosphere

An outside air temperature of 35°c is measured while cruising at fl 200 what ?

Question 137-15 : 10°c colder than isa 10°c warmer than isa 5°c warmer than isa 5°c colder than isa

exemple 293 10°c colder than isa. — Admin .the temperature lapse rates of the troposphere is mean value 0 65°c/100 m or 2°c/1000 ft .in isa temperature at fl200 should be 15° 2x20 = 25°c .as the current temperature at that level is 35°c you can say that at fl200 it is currently isa 10°c 10°c colder than isa.

The qnh of an airport at sea level is 983 hpa and the temperature deviation ?

Question 137-16 : 8640 ft 10160 ft 9740 ft 11460 ft

exemple 297 8640 ft. — Admin .difference between standard pressure 1013 hpa and qnh 983 hpa is 30 hpa .difference between pressure altitude fl100 = 10000 ft and barometric altitude is 30 hpa x 27 ft = 810 ft .barometric altitude = 10000 810 = 9190 ft .difference between barometric altitude and true altitude is 4 ft per thousand per degree of temperature deviation 4% per 10° deviation = 4 x 15 x 9 19 = 550 ft .true altitude = 9190 550 = 8640 ft 8640 ft.

What information is required to convert a minimum safe altitude into a lowest ?

Question 137-17 : Lowest value of qnh and the highest negative temperature deviation from isa highest value of qnh and the highest negative temperature deviation from isa highest value of qnh and the highest positive temperature deviation from isa lowest value of qnh and the lowest negative temperature deviation from isa

exemple 301 Lowest value of qnh and the highest negative temperature deviation from isa. — Admin .lowest value of qnh the lowest usable flight level is determined by the atmospheric pressure in the area of operation it will give the highest safety margin .highest negative temperature deviation from isa since cold air is denser than warm air when operating in temperatures that are colder than standard our true altitude is lower than the altimeter indication .if we convert a minimum safe altitude into a flight level by choosing the lowest aera qnh value and the highest negative temperature deviation from isa we will be ok at that flight level and better off wherever you go elsewhere in the region Lowest value of qnh and the highest negative temperature deviation from isa.

What is the relationship if any between qfe and qnh at an airport situated 50 ?

Question 137-18 : Qfe is greater than qnh qfe is smaller than qnh qfe equals qnh no clear relationship exists

exemple 305 Qfe is greater than qnh. — Admin .the qfe indicates in standard atmosphere the height of the aircraft above the official airport elevation an altimeter set to qfe will therefore read zero when on the ground .qnh is the setting which will give airfield elevation when parked on the airfield .on the airport in order to read the airport elevation of 50 ft on your altimeter you must set qnh if you want to read 0 ft you must set qfe .you have to turn clockwise the adjustment knob qfe will be greater than qnh . 513 Qfe is greater than qnh.

You plan a flight over a mountain range at a true altitude of 15000 ft/amsl the ?

Question 137-19 : 16230 ft 15690 ft 14370 ft 13830 ft

exemple 309 16230 ft. — Admin .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 .1013 1003 = 10 hpa.10 x 27 = 270 ft.15000 ft + 270 ft = 15270 ft your altimeter will over read .altitude/height changes by 4% for each 10°c temperature deviation from isa.temperature correction = 4 x 15 27 x 15.temperature correction = 916 2 ft.approximate indication should the altimeter read 15270 + 916 = 16186 ft .close enough to the result desired .iguano .maybe is not an error but i thought that when its colder than isa you have to subtract the temperature correction . .the question states what approximate indication should the altimeter setting 1013 2 hpa read our altimeter must read a higher altitude than the true altitude we currently want in those conditions cold air and low qnh to be sure to overfly the mountain at actually 15000 ft/amsl 16230 ft.

During a flight at fl 100 from marseille qnh 1012 hpa to palma de mallorca qnh ?

Question 137-20 : The air at marseille is warmer than that at palma de mallorca the altimeters are erroneous and need to be tested the air at marseille is colder than that at palma de mallorca one of the two qnh values may be incorrect

exemple 313 The air at marseille is warmer than that at palma de mallorca. — Admin .to be at the same true altitude over the 1012hpa datum marseille the air must be warmer than it is over the 1015hpa pressure datum palma de mallorca The air at marseille is warmer than that at palma de mallorca.

An aircraft lands at an airport airport elevation 1240 ft qnh 1008 hpa the ?

Question 137-21 : 1375 ft 1200 ft 1105 ft 1280 ft

exemple 317 1375 ft. — Admin .you are on the runway with a setting of 1008 hpa your altimeter indicates 1240 ft .if you turn the altimeter setting adjustement knob in a clockwise direction to increase the subscale to 1013 hpa the indicated alitude will increase the needle will turn in the same direction . 514.1013 1008 = 5 hpa.5 hpa x 27 ft/hpa = 135 ft .1240 + 135 = 1375 ft 1375 ft.

After landing at an aerodrome aerodrome elevation 1715 ft the altimeter ?

Question 137-22 : 1028 hpa 1015 hpa 1013 hpa 998 hpa

exemple 321 1028 hpa. — Admin .you are on the runway with a setting of 1013 hpa your altimeter indicates 1310 ft .if you want to read aerodrome elevation you have to turn altimeter setting adjustement knob in a clockwise direction to increase the indicated alitude . 514.1715 1310 = 405 ft.405 ft / 27 ft/hpa = 15 hpa .1013 + 15 = 1028 hpa 1028 hpa.

You intend to overfly a mountain range the recommended minimum flight altitude ?

Question 137-23 : 14100 ft 13830 ft 14370 ft 15900 ft

exemple 325 14100 ft. — Admin .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 .15000 x 4 x 1 5 = 900 ft.you are flying at 15000 + 900 = 15900 ft .thus you can fly 900 ft lower than the stated 15900 ft which will give you an indicated altitude of 14100 ft .the question states the altimeter is set to qnh 1023 hpa we don't change this value we are not going to fly on flight level 1013 hpa 14100 ft.

You are flying at fl 130 and your true altitude is 12000 ft what is the ?

Question 137-24 : Isa 20°c isa +/ 0°c isa +20°c isa +12°c

exemple 329 Isa -20°c. — Admin .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 13 x temperature deviation = 1000 ft.temperature deviation = 1000 ft / 4 x 13 = 19 2°c.true altitude is lower than pressure altitude so this is 'minus' 20°c Isa -20°c.

Which one of the following statements applies to the tropopause ?

Question 137-25 : It separates the troposphere from the stratosphere it is by definition an isothermal layer it indicates a strong temperature lapse rate it is by definition a temperature inversion

exemple 333 It separates the troposphere from the stratosphere — Admin .the tropopause is a boundary with no finite thickness the tropopause is the region of the atmosphere where the environmental lapse rate changes from positive as it behaves in the troposphere to the stratospheric negative one following is the exact definition used by the world meteorological organization the boundary between the troposphere and the stratosphere where an abrupt change in lapse rate usually occurs it is defined as the lowest level at which the lapse rate decreases to 2 °c/km or less provided that the average lapse rate between this level and all higher levels within 2 km does not exceed 2 °c/km It separates the troposphere from the stratosphere

The 0° isotherm is forecast to be at fl 50 at what fl would you expect a ?

Question 137-26 : Fl 80 fl 20 fl 100 fl 110

exemple 337 Fl 80. — Admin .the temperature lapse rates of the troposphere is mean value 0 65°c/100 m or 2°c/1000 ft .6° / 2° per 1000 ft = 3000 ft .fl50 + 3000 ft = fl80 Fl 80.

A vertical spacing of 1000 ft is the standard required separation between two ?

Question 137-27 : Less than 1000 ft it remains 1000 ft more than 1000 ft without qnh information it can not be determined

exemple 341 Less than 1000 ft. — Admin . 515.in flight level aircraft are using the same subscale reference 1013 25 hpa .theoretical separation is 1000 ft actual separation is less when air mass is colder than standard Less than 1000 ft.

Over paris at what flight level would you expect to find the tropopause ?

Question 137-28 : Fl 300 fl 330 fl 150 fl 280

exemple 345 Fl 300. — Admin .tropopause is at fl290 north est and at fl340 south west of paris .we would expect to find the tropopause at fl300 over paris Fl 300.

What is the approximate height of the tropopause between munich and helsinki . ?

Question 137-29 : Fl 340 fl 280 fl 300 fl 390

exemple 349 Fl 340. — Admin . 523.the approximate height of the tropopause between munich and helsinki is fl340 .400 on the one hand 300 on the other hand even if the height change is not uniform fl340 remains the only valid answer Fl 340.

At what approximate flight level is the tropopause over frankfurt . 276 ?

Question 137-30 : Fl 330 fl 300 fl 350 fl 240

exemple 353 Fl 330. — Admin . 526.you have to interpolate between different heights placing the tropopause at approximately fl 330 over frankfurt Fl 330.

The temperature at fl 330 overhead london will be . 278 ?

Question 137-31 : 45°c 39°c 33°c 57°c

exemple 357 -45°c. — Admin .the height of the tropopause over london is fl290 above the tropopause the temperature stays constant close to london t° is around 45°c at fl390 so between fl290 and fl390 no change -45°c.

What is the average temperature at fl 160 between oslo and paris . 282 ?

Question 137-32 : 19°c 23°c 15°c 25°c

exemple 361 -19°c. — Admin .this chart is given for fl180 .at fl180 between oslo and paris average temperature is . 25 + 24 + 23 + 21 + 21 /5 = 114 / 5 = around 23°c .average temperature at fl160 is 4° warmer 2° per 1000ft = 19°c -19°c.

What is the temperature deviation in degrees celsius from the icao standard ?

Question 137-33 : Isa 13°c isa 2°c isa +13°c isa +2°c

exemple 365 Isa -13°c — Admin .at fl180 in a standard atmosphere temperature is .15° 2° x 18 = 21ºc.on the chart overhead frankfurt temperature at fl180 is 34°c.temperature deviation is 34° + 21° = 13°c .we can say that temperature overhead frankfurt at fl180 is colder than icao standard atmosphere Isa -13°c

What oat would you expect at fl 200 over geneva . 289 ?

Question 137-34 : 24°c 20°c 16°c 28°c

exemple 369 -24°c. — Admin .this chart is given for fl180 .at fl180 average temperature is . 20 + 21 + 19 + 21 /4 = 81 / 4 = around 20°c .average temperature at fl200 is 4° colder 2° per 1000ft = 24°c -24°c.

An altimeter adjusted to 1013 hpa indicates an altitude of 3600 ft should this ?

Question 137-35 : 3006 ft 2922 ft 4278 ft 4194 ft

exemple 373 3006 ft. — Admin .your altimeter adjusted to 1013 hpa indicates an altitude of 3600 ft .you have to turn altimeter setting adjustement knob in a counter clockwise direction to set 991 hpa in the subscale window the altimeter needle will turn in the same direction counter clockwise . 541.decreasing altimeter setting by 22 hpa 1013 991 .22 hpa x 27 ft/hpa = 594 ft .indicated altitude decreases by 594 ft 3600 594 = 3006 ft 3006 ft.

In geneva the local qnh is 994 hpa the elevation of geneva is 1411 ft the qfe ?

Question 137-36 : 942 hpa 967 hpa 961 hpa 952 hpa

exemple 377 942 hpa. — Admin .the qfe indicates in standard atmosphere the height of the aircraft above the official airport elevation an altimeter set to qfe will therefore read zero when on the ground .qnh is the setting which will give airfield elevation when parked on the airfield .with a subscale setting of 994 hpa on the ground at geneva your altimeter reads 1411 ft .you want to read 0 ft .you must turn anti clockwise the adjustment knob 1 hpa = 27 ft .1411 / 27 = 50 hpa .994 52 = 942 hpa . 531 942 hpa.

An aircraft is flying at fl 80 the local qnh is 1000 hpa after the second ?

Question 137-37 : 7650 ft 8600 ft 8350 ft 8000 ft

exemple 381 7650 ft. — Admin .your main altimeter remains at 1013 hpa with a reading of 8000 ft the second is set at 1000 hpa you have to turn altimeter setting adjustement knob in a counter clockwise direction the altimeter needle will turn also counter clockwise . 541.decreasing altimeter setting by 13 hpa .13 hpa x 27 ft/hpa = 351 ft .indicated altitude decreases by 351 ft 8000 351 = 7649 ft 7650 ft.

The barometric compensator of an altimeter is locked on reference 1013 2 hpa ?

Question 137-38 : 20 ft 11 ft 10 ft 560 ft

exemple 385 20 ft. — Admin .1023 1013 = 10 hpa .10 hpa x 27 ft/hpa = 270 ft .290 ft 270 ft = 20 ft .imagine if you landed on this airfield with the correct subscale setting 1023 hpa the reading on the altimeter on the ground will be 290 ft now if you set 1013 hpa in the subscale the needles will turn couter clockwise and the altimeter will read 20 ft 20 ft.

The upper wind and temperature chart of 250 hpa corresponds in a standard ?

Question 137-39 : 34 000 ft 39 000 ft 30 000 ft 32 000 ft

exemple 389 34 000 ft. — Admin .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/27 ft 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 34 000 ft.

Going from the equator to the north pole the altitude of the tropopause ?

Question 137-40 : Decreases and its temperature increases increases and its temperature increases increases and its temperature decreases decreases and its temperature decreases

exemple 393 Decreases and its temperature increases. — Admin . 491.height of the tropopause .polar tropopause 8 km 45°c .tropicale tropopause 15 km 75°c .equatorial tropopause 16 km 80°c Decreases and its temperature increases.

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