Altimetry Flashcards

1
Q

Altimetry based threats

A

False indication due incorrect pressure reference
False indication due to icing / weather conditions
Risk of impact with terrain or obstacles
Risk of loss of separation with other aircraft

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2
Q

Define height:

A

Height: The vertical distance of an aircraft, level or point with respect to a specified fixed datum

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3
Q

Define altitude:

A

Altitude: The vertical distance of an aircraft, level or point, with respect to the datum of mean sea level (MSL)

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4
Q

Define elevation:

A

Elevation: The vertical distance of a point or a level, on or affixed to the surface of the earth measured from mean sea level

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5
Q

Define Indicated altitude

A

Indicated Altitude: It is the reading on the altimeter when it is set to the local barometric pressure at mean sea level

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6
Q

Define true altitude

A

True Altitude: it is the actual vertical distance above mean sea level (MSL)

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7
Q

What type of instrument is an altimeter?

A

Altimeters (instruments in flight decks showing elevation / altitude), are aneroid barometers

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8
Q

Define SPS

A

Standard pressure setting
1013.25

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9
Q

Define pressure altitude

A

Pressure Altitude: is the height above a standard datum plane (SDP), which is a theoretical level where the weight of the atmosphere is 1013.2 hPa (29.92 “Hg ) as measured by a barometer

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10
Q

Define the transition altitude

A

The Transition Altitude is the altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (ICAO definition)

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11
Q

When is an aircraft’s position described in altitude (ft)

A

when an aircraft is at or below the transition altitude, its vertical position is expressed in terms of altitude, which is determined from an altimeter set to sea level pressure (QNH)

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12
Q

VFR flight levels (above 3000ft)
What headings and what levels?

A

Aircraft track between:

000° - 179° ->
FL ODD number (thousand) + 500

180° - 359° ->
FL EVEN number (thousand) + 500

FL35
FL45
FL55
FL65

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13
Q

IFR Flight Levels
What headings and what levels?

A

Aircraft track between:

000° - 179° -> FL ODD number (thousand)

180° - 359° -> FL EVEN number (thousand)

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14
Q

Describe the Semi-circular rule

A

VFR and IFR
FL are offset depending on MAGNETIC headings

East Odd
West Even

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15
Q

When is the vertical position of an aircraft expressed in terms of flight level?

A

In flight above the transition altitude, the vertical position of an aircraft is expressed in terms of flight levels, which are surfaces of constant atmospheric pressure based on an altimeter setting of 1 013.2 hPa

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16
Q

Define transition level

A

Transition level is the lowest flight level available for use above the transition altitude (ICAO definition)

17
Q

Define transition layer

A

Transition layer is the airspace between the transition altitude and the transition level

18
Q

What size is transition level?

A

The transition level is not fixed and is determined by ATS depending on the daily atmospheric pressure

19
Q

High to low

A

lookout below
(temperature and pressure)

20
Q

Flying from a colder area to a warmer area does what to True altitude

A

Flying from a colder area to a warmer area => True altitude increases for the same indicated Altitude

21
Q

Flying from a warmer area to a colder area what happens to True altitude?

A

Flying from a warmer area to a colder area => True altitude decreases for the same indicated Altitude

22
Q

TEC = ?

A

TEC = Height/1000 x 4 x ISA deviation.

23
Q

ISA deviation = ?

A

ISA Deviation = 15 - (2 x (altitude/1000))

24
Q

TEC - when ISA deviation is warmer

A

Add the TEC to the Indicated Altitude to get the True Altitude

Subtract the TEC from the True Altitude to get the Indicated Altitude

25
Q

TEC - when ISA deviation is cooler

A

Subtract the TEC from the Indicated Altitude to get the True Altitude

Add the TEC to the True Altitude to get the Indicated Altitude

26
Q

Temperature error correction from where to where?

A

Block of air beneath the aircraft

27
Q
A