C06 - Altimetry Flashcards
What does QFE measure?
Field Elevation.
QFE is the ‘____’ pressure at the Aerodrome Reference Point?
Barometric.
QFE is the recorded ‘____’ pressure at the Aerodrome?
Surface.
What does the Altimeter indicate when a Pilot sets QFE on the subscale (2)?
- 0 ft at the Aerodrome Reference Point.
- Height above the surface.
What does QNH measure?
Nautical Height.
How is QNH calculated?
Calculated Barometric pressure at Mean Sea Level.
QNH is the Aerodrome’s ‘____’?
Mean Sea Level Pressure.
What does the Altimeter indicate when a Pilot sets QNH on the subscale (3)?
- 0 ft at Mean Sea Level.
- Altitude above Mean Sea Level.
- Elevation of the Aerodrome.
What does QNE measure?
Height when Landing at an Aerodrome when 1013.25 hPa is set on the Altimeter Sub Scale.
True or False. QNE is a Pressure Setting?
False. It’s a Height.
When will a Pilot use QNE?
At High Elevation Aerodromes.
What does Regional QNH measure?
Regional Pressure Setting is the lowest QNH within a specific region.
When will Regional Pressure Setting be most likely used?
During Cross-Country flights at relatively low Altitudes.
What does SPS stand for?
Standard Pressure Setting.
What is the Datum for SPS?
ISA Mean Sea Level Pressure of 1013.25 hPa.
When will SPS be used?
An Aircraft that are flying above the Transition Level.
What does the Altimeter indicate when a Pilot sets SPS on the subscale?
Pressure Altitude of the Aircraft above 1013.25 hPa.
Aircraft which use SPS use what to distinguish their Altitudes?
Flight Levels.
What are the dangers of Horizontal Pressure Variation?
Could lead to false Height/Altitude if the Altimeter is not correctly changed to reflect the ambient pressure.
Flying from a High Pressure Area to a Low Pressure Area, True Altitude ‘____’ while the Indicated Altitude ‘____’. The Altimeter error will ‘____’ True Altitude (3)?
- Reduces.
- Remains the same.
- Over Read.
Flying from a Low Pressure Area to a High Pressure Area, True Altitude ‘____’ while the Indicated Altitude ‘____’. The Altimeter error will ‘____’ True Altitude (3)?
- Increases.
- Remains the same.
- Under Read.
High Pressure is where True Altitude is ‘____’ than Indicated Altitude (QNH)?
Greater.
Low Pressure is where True Altitude is ‘____’ than Indicated Altitude (QNH)?
Less.
What is the common saying, from high to low?
Look down below.
Where is setting Aerodrome QNH vital when entering the vicinity of an Aerodrome (2)?
- Ensure the correct Altitude in the vicinity of the Aerodrome.
- Ensures all Aircraft are using the same pressure datum to maintain separation.
When flying Cross-Country at Low-Altitudes, your Altimeter should be set to what type of pressure settings?
Regional Pressure Settings.
Published Height Above Sea Level at which Pilots climbing to their cruising level change their Barometric Altimeter from RPS to International Standard of 1013.25 hPa. What am I?
Transition Altitude.
The Lowest available Flight Level. It guarantees minimum vertical separation of 500 ft from an Aircraft flying at the highest assignable Altitude on QNH. What am I?
Transition Level.
Above Transition Altitude, the Altimeter should be set to?
Standard Pressure Settings.
Below the Transition Altitude, the Altimeter should be set to?
QNH.
When should QNH be set when descending from Transition Altitude?
At Transition Level.
The Airspace between the Transition Altitude and Transition Level is known as?
Transition Layer.
Which layer is higher, the Transition Altitude of Transition Level?
Transition Level.
True or False. Temperature of Air affects the Pressure Lapse Rate?
True.
In Cool Air, the Pressure ‘____’ more rapidly with Height?
Decreases.
In Warm Air, the Pressure ‘____’ less slowly with Height?
Decreases.
Flying from an area of Warm Air to an area of Cold Air, True Altitude ‘____’ while the Indicated Altitude ‘____’. The Altimeter error will ‘____’ True Altitude (3)?
- Decreases.
- Remains the same.
- Over Read.
Flying from an area of Cold Air to an area of Warm Air, True Altitude ‘____’ while the Indicated Altitude ‘____’. The Altimeter error will ‘____’ True Altitude (3)?
- Increases.
- Remains the same.
- Under Read.
Warm Air is where True Altitude is ‘____’ than Indicated Altitude (QNH)?
Less.
Cold Air is where True Altitude is ‘____’ than Indicated Altitude (QNH)?
Greater.
What is the common saying, from hot to cold?
Don’t be bold.
What is True Altitude?
Vertical Distance of the Aircraft Above Sea Level.
