ATM Lesson 3 Flashcards
(35 cards)
In altimetry, how is height defined
The vertical distance of a level, point or object measured from a specified datum
In altimetry, how is altitude defined
The vertical distance of a level, point or object measured from mean sea level (MSL)
In altimetry, how is flight level defined
A surface of constant pressure related to ISA (international standard atmosphere) separated at intervals
In altimetry, how is level defined
A generic term relating to the vertical position of aircraft in flight; height, altitude, flight level
In altimetry, how is elevation defined
The vertical distance of a point or level affixed to the earths surface from the mean sea level (MSL)
In altimetry, how is aerodrome elevation defined
The elevation of the highest point of an aerodrome landing area
What two elevations of a runway are always published
Aerodrome elevation (highest point of the landing area)
Threshold elevation (highest point of first part of runway available to land on)
Published when a greater than 7ft difference between the two
In altimetry, what is QFE
Atmospheric pressure corrected for a specified elevation, typically aerodrome/threshold elevation
In altimetry, what is QNH
Atmospheric pressure corrected to mean sea level, assuming international standard atmosphere (ISA) conditions)
In altimetry, how many ft would need to be climbed in order for 1 hPa to drop
30ft
What must be entered into an altimeter in order for it to display the correct flight level
A pressure setting for it to reference from
What is the ISA standard pressure setting
1013 hPa
In altimetry, what can be understood by the term aircraft height
The vertical distance between an aircraft and the ground or aerodrome
If an aircraft is flying circuits what pressure setting reference will it likely use
QFE, it measures the height from the aerodrome which is much more useful than QNH measuring above MSL
In altimetry, what can be understood by the term aircraft altitude
The vertical distance of the aircraft above mean sea level (MSL). QNH
If an aircraft has the QNH set for its altimeter and it is on the ground at an aerodrome what will it show
The height of the aerodrome compared to mean sea level
In altimetry, how does height and altitude differ
Height is the vertical distance between a level, object or point and a datum like an airfield.
Altitude is the vertical distance between a point, object or level and MSL
At what point does a pilot change from using altitude to flight levels for measuring vertical distance
The transition altitude
When a pilot is using flight levels, what pressure setting is used
1013hPa, the international standard atmosphere (ISA)
What is the big advantage of using FL
It ensures flights are guaranteed vertical separation irrespective of local pressure variation
For a typical flight from one aerodrome to another, what pressure setting may a pilot use
QNH at departure, updated by ATSU information until at transition layer when swap to flight levels hence 1013 hPa. Reverting to QNH as given the the pilot for descent and landing when again passing through the transition layer
In altimetry, how are transition level, transition altitude and transition layer defined and what is their relationship
Transition altitude is the altitude at or below where vertical position is controlled by altitudes
Transition level is the lowest flight level available above the transition altitude
Transition layer is the airspace between transition altitude and transition level
What is the standard transition altitude in the UK, and what is an example where it differes
3000ft, a most large aerodrome it is 5000ft-6000ft
Where can the transition altitude above an airport be found
Approach and departure charts
