atpl/oxford/met/ch9 Flashcards
MSA given as 12,000ft, flying over mountains in temperatures +9°C, QNH set as 1023 (obtained from a nearby airfield). What will the true altitude be when 12,000ft is reached?
12,864
When flying at FL180 in the Southern Hemisphere you experience a left to right crosswind. What is happening to your true altitude if indicated altitude is constant?
Decreasing
Which of these would cause your true altitude to decrease with a constant indicated altitude?
Cold/Low
You are flying in an atmosphere which is warmer than ISA, what might you expect?
True altitude to be higher than Indicated altitude
The QNH is 1030 hPa and at the Transition Level you set the SPS. What happens to your indicated altitude (assume 27ft per 1 hPa)?
Drops by 459 ft
How do you calculate the lowest useable flight level?
c. Highest QNH and highest temperature above ISA
QNH is 1003. At FL100 true altitude is 10,000ft. Is it
Warmer than ISA
How is QNH determined from QFE?
Using the elevation
QFE is 1000hPa with an airfield elevation of 200m AMSL. What is QNH? (use 8 m per hPa)
1025 HPa
Which of the following is true? QNH is:
Never 1013.25 hPa
QNH is 1030. Aerodrome is 200m AMSL. What is QFF?
Not enough info
If an Aerodrome is 1500ft AMSL on QNH 1038, what will the actual height AGL to get to FL75 be?
6675 ft
Altimeter set to 1023 at aerodrome. On climb to altitude the SPS is set at transition altitude. What will indication on altimeter do on resetting to QNH?
Increase
What temperature and pressure conditions would be safest to ensure that your flight level clears all the obstacles by the greatest margin?
Temp more than or equal to ISA and a QNH greater than 1013
Flying at FL 135 above the sea, the Radio Altimeter indicates a true altitude of 13500 ft. The local QNH is 1019 hPa. Hence the crossed air mass is, on average,
Colder than ISA
An airfield has an elevation of 540ft with a QNH of 993mb. An aircraft descends and lands at the airfield with 1013mb set. What will its altimeter read on landing?
1080ft
When is pressure altitude equal to true altitude?
In standard conditions
What is the relationship between QFE and QNH at an airport 50ft below MSL?
QFE > QNH
You are flying at FL160 with an OAT of -27°C. QNH is 1003 hPa. What is your true altitude?
b) 15,090 ft
Up to FL 180 ISA Deviation is ISA +10°C. What is the actual depth of the layer between FL 60 and FL 120?
b. 6240 ft
Up to FL 180 ISA Deviation is ISA -10°C. What is the actual depth of the layer between FL 60 and FL 120?
C. 5760 ft
What condition would cause your indicated altitude to be lower than that being actually flown?
temperature higher than standard
You fly over the sea at FL 90, your true altitude is 9100 ft and QNH is unknown. What can be said about the atmosphere temperature?
Nothing, insufficient information.
You are flying at FL 100 in an airmass that is 15°C colder than ISA. Local QNH is 983 hPa. What would the true altitude be?
8590 ft
Which statement is true?
QNH can be equal to QFE
You fly from east to west at the 500 hPa level in the Northern Hemisphere;
if the wind is from the north there will be a gain in altitude
You have landed on an airport elevation 1240 ft and QNH 1008 hPa. Your altimeter subscale is erroneously set to 1013 hPa. The indication on the altimeter will be:
1375 ft
You are cruising at FL 200, OAT is -40°C, sea level pressure is 1033 hPa. Calculate the true altitude.
19340 ft
