Podcast
Questions and Answers
During a flight over the sea from Marseille to Palma de Mallorca at FL 100, the true altitude is constantly increasing. What could be the reason for this?
During a flight over the sea from Marseille to Palma de Mallorca at FL 100, the true altitude is constantly increasing. What could be the reason for this?
- There is a discrepancy in the QNH values
- The plane is drifting to the right
- The altimeter is malfunctioning
- The air around Palma is warmer than the air around Marseille (correct)
What is the recommended minimum flight altitude when overflying a mountain range with an air mass that is 15° C warmer than the standard atmosphere?
What is the recommended minimum flight altitude when overflying a mountain range with an air mass that is 15° C warmer than the standard atmosphere?
- 14100 FT (correct)
- 13830 FT
- 14370 FT
- 15900 FT
What is the difference between QNH and QFE at an airport dependent on?
What is the difference between QNH and QFE at an airport dependent on?
- The air pressure as well as the air temperature of the airport
- Always the same
- The (ambient) air temperature of the airport
- The air pressure at the airport (correct)
If you change the pressure reference on your altimeter from QNH = 1023 hPa to standard setting (1013hPa) after landing at an airport, what will your altimeter indicate?
If you change the pressure reference on your altimeter from QNH = 1023 hPa to standard setting (1013hPa) after landing at an airport, what will your altimeter indicate?
What should be taken into account when determining the recommended flight altitude to overfly a mountain range?
What should be taken into account when determining the recommended flight altitude to overfly a mountain range?
What can cause variations in altimeter readings during a flight?
What can cause variations in altimeter readings during a flight?
If the air mass you are flying through is 10° C warmer than ISA, what will be the altitude shown on your altimeter when you have reached the recommended minimum altitude of 12000 feet?
If the air mass you are flying through is 10° C warmer than ISA, what will be the altitude shown on your altimeter when you have reached the recommended minimum altitude of 12000 feet?
An aircraft flying at an indicated altitude of 2500 ft enters an area of lower pressure without adjusting the subscale setting. What will happen to the aircraft?
An aircraft flying at an indicated altitude of 2500 ft enters an area of lower pressure without adjusting the subscale setting. What will happen to the aircraft?
An aircraft is flying at FL 90 (9000 ft pressure altitude) over the sea, with a true altitude of 9100 ft. What assumption can be made about the air mass in which the aircraft is flying?
An aircraft is flying at FL 90 (9000 ft pressure altitude) over the sea, with a true altitude of 9100 ft. What assumption can be made about the air mass in which the aircraft is flying?
When an aircraft passes the Transition Altitude and the pilot adjusts the subscale accordingly, what will happen to the indicated altitude?
When an aircraft passes the Transition Altitude and the pilot adjusts the subscale accordingly, what will happen to the indicated altitude?
When flying over mountainous terrain, what is the recommended minimum altitude to ensure terrain clearance?
When flying over mountainous terrain, what is the recommended minimum altitude to ensure terrain clearance?
If the air mass through which you are flying is colder than ISA, what will be the altitude shown on your altimeter when you have reached the recommended minimum altitude of 12000 feet?
If the air mass through which you are flying is colder than ISA, what will be the altitude shown on your altimeter when you have reached the recommended minimum altitude of 12000 feet?
What is the pressure altitude when the barometric pressure scale is set to 29.92 inHg?
What is the pressure altitude when the barometric pressure scale is set to 29.92 inHg?
An aircraft descends and lands at an airfield with a QNH of 1013mb set. If the airfield has an elevation of 540ft, what will its altimeter read on landing?
An aircraft descends and lands at an airfield with a QNH of 1013mb set. If the airfield has an elevation of 540ft, what will its altimeter read on landing?
An aircraft is to fly at an indicated altitude of 5000 ft from X (elevation 850 ft, QNH 984 hPa) to Y (elevation 2300 ft, QNH 1024 hPa). What is the true height of the aircraft over X and Y?
An aircraft is to fly at an indicated altitude of 5000 ft from X (elevation 850 ft, QNH 984 hPa) to Y (elevation 2300 ft, QNH 1024 hPa). What is the true height of the aircraft over X and Y?
If the QNH at an airfield is 1009 hPa and the air temperature is 10°C lower than standard, what is the QFF?
If the QNH at an airfield is 1009 hPa and the air temperature is 10°C lower than standard, what is the QFF?
Flying at FL135, the radio altimeter indicates a true altitude of 13,500 ft and the local QNH is 1019 hPa. What is the average temperature deviation of the crossed air mass?
Flying at FL135, the radio altimeter indicates a true altitude of 13,500 ft and the local QNH is 1019 hPa. What is the average temperature deviation of the crossed air mass?
What is the recommended flight altitude for VFR flights based on terrain clearance?
What is the recommended flight altitude for VFR flights based on terrain clearance?
Flashcards
What explains the increase in true altitude during a flight from Marseille to Palma de Mallorca at FL100?
What explains the increase in true altitude during a flight from Marseille to Palma de Mallorca at FL100?
The air around Palma is warmer than the air around Marseille.
Recommended minimum flight altitude over mountains with 15°C warmer air than standard?
Recommended minimum flight altitude over mountains with 15°C warmer air than standard?
14100 FT
What determines the difference between QNH and QFE at an airport?
What determines the difference between QNH and QFE at an airport?
The air pressure at the airport.
What will your altimeter indicate after changing the pressure setting from QNH 1023 hPa to standard (1013 hPa) after landing?
What will your altimeter indicate after changing the pressure setting from QNH 1023 hPa to standard (1013 hPa) after landing?
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What factors should be considered for recommended flight altitude over a mountain range?
What factors should be considered for recommended flight altitude over a mountain range?
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What can cause variations in altimeter readings during a flight?
What can cause variations in altimeter readings during a flight?
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What altitude will be shown on your altimeter if the air mass is 10°C warmer than ISA and you reach 12000 feet?
What altitude will be shown on your altimeter if the air mass is 10°C warmer than ISA and you reach 12000 feet?
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What happens to an aircraft flying at 2500ft indicated altitude when entering an area of lower pressure without adjusting the subscale?
What happens to an aircraft flying at 2500ft indicated altitude when entering an area of lower pressure without adjusting the subscale?
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What can we conclude about the air mass when an aircraft at FL90 has a true altitude of 9100 ft?
What can we conclude about the air mass when an aircraft at FL90 has a true altitude of 9100 ft?
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What happens to the indicated altitude when an aircraft passes Transition Altitude and the pilot adjusts the subscale accordingly?
What happens to the indicated altitude when an aircraft passes Transition Altitude and the pilot adjusts the subscale accordingly?
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What is the recommended minimum altitude to ensure terrain clearance over mountainous terrain?
What is the recommended minimum altitude to ensure terrain clearance over mountainous terrain?
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If the air mass you're flying through is colder than ISA, what altitude will be shown on your altimeter when you reach the recommended minimum altitude of 12000 feet?
If the air mass you're flying through is colder than ISA, what altitude will be shown on your altimeter when you reach the recommended minimum altitude of 12000 feet?
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What is the pressure altitude when the barometric pressure scale is set to 29.92 inHg?
What is the pressure altitude when the barometric pressure scale is set to 29.92 inHg?
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An aircraft lands at an airfield with QNH 1013mb and an elevation of 540ft. What will the altimeter read?
An aircraft lands at an airfield with QNH 1013mb and an elevation of 540ft. What will the altimeter read?
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An aircraft flies at 5000ft indicated altitude from X (850ft, 984hPa) to Y (2300ft, 1024hPa). What is the true altitude over both locations?
An aircraft flies at 5000ft indicated altitude from X (850ft, 984hPa) to Y (2300ft, 1024hPa). What is the true altitude over both locations?
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What is the QFF if the QNH is 1009 hPa and the air temperature is 10°C lower than standard?
What is the QFF if the QNH is 1009 hPa and the air temperature is 10°C lower than standard?
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What is the average temperature deviation of the air mass flown through when at FL135, the radio altimeter indicates a true altitude of 13,500 ft and the local QNH is 1019 hPa?
What is the average temperature deviation of the air mass flown through when at FL135, the radio altimeter indicates a true altitude of 13,500 ft and the local QNH is 1019 hPa?
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What is the recommended flight altitude for VFR flights based on terrain clearance?
What is the recommended flight altitude for VFR flights based on terrain clearance?
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Study Notes
Altimeter and QNH Settings
- When flying over a mountain range, the recommended minimum flight altitude is 15000 FT/AMSL, and the air mass is 15°C warmer than the standard atmosphere, with an altimeter set to QNH (1023 hPa), the altimeter reading would be approximately 13830 FT.
Flight Planning and Navigation
- When flying over the sea from Marseille to Palma de Mallorca, the true altitude increases due to warmer air around Palma de Mallorca.
Altimeter Readings and QNH
- The difference between QNH and QFE is dependent on the air pressure at the airport.
- When landing at an airport, setting QNH = 1023 hPa as reference pressure on the altimeter, and the altimeter indicates 1200 ft, changing the pressure reference to standard setting (1013hPa) would show a different reading.
Mountain Flight Planning
- When flying over a mountain range, the chart recommends a minimum altitude of 12000 feet above mean sea level, with an air mass 10°C warmer than ISA, and an altimeter set to 1023 hPa (QNH), the altimeter would show approximately 11520 feet.
Air Mass Temperature
- When flying over the sea at FL 90, the true altitude is 9100 feet, and the local QNH is unknown, it can be assumed that the air mass is colder than ISA.
Altimeter Settings and Indications
- When an aircraft is flying towards an area of lower pressure and fails to revise the subscale setting, it will gradually climb.
- When an aircraft descends and lands at an airfield with a different QNH setting, the altimeter reading will be affected.
- On takeoff, setting the altimeter to the local QNH of 1023 hPa, and adjusting the subscale accordingly, the indicated altitude may increase or decrease depending on the air mass temperature.
Pressure Altitude and QFF
- Pressure altitude is the indicated altitude corrected for non-standard temperature and pressure.
- QFF is the altimeter setting that makes the altimeter read zero at sea level.
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Description
Test your knowledge on calculating altimeter reading based on altitude recommendations, air temperature deviation from ISA, and QNH setting. Determine the altitude shown on the altimeter when reaching the recommended minimum altitude for mountain flying.
