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ATC > Altimetry 1 > Flashcards

Altimetry 1 Flashcards

1
Q

What is the definition of a Dyne?

A

A Dyne is the force required to produce an acceleration of 1cm per second to a mass of 1gm.

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2
Q

What is the definition of a Hectopascal?

A

A Hectopascal is 1000 dynes per square cm.

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3
Q

What is the ISA?

A

The International Standard Atmosphere

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4
Q

What is the atmospheric pressure at MSL for ISA?

A

1013.25 hPa

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5
Q

What is the temperature at MSL for ISA?

A

Temperature is 15 degrees Celsius at MSL

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6
Q

What is the lapse rate for ISA?

A

Lapse rate is a decrease of 1.98c per 1000ft increase in altitude.
From 15c at MSL to -56.5 at 36,090ft.
Above this attitude it remains constant at -56.5c.

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7
Q

How does pressure change with change in vertical position?

A

For every 30ft up pressure drops 1 hPa

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8
Q

What is the definition of height?

A

The vertical distance of a level, a point or an object considered as a point, measured from a specified datum.(defined altitude)

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9
Q

What is the definition of Altitude?

A

The vertical distance of a level, a point or an object considered as a point, measured from mean sea level (MSL).

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10
Q

What is the definition of elevation?

A

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

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11
Q

What is the definition of QFE?

A

QFE is the atmospheric pressure connected to a specific elevation e.g. the official aerodrome elevation or the runway threshold elevation.

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12
Q

What is the definition of QNH?

A

QNH is the atmospheric pressure corrected to mean sea level, assuming International Standard Atmosphere conditions across the height difference.

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13
Q

What is the definition of Aerodrome elevation?

A

It is the elevation of the highest point of the landing area. Visual manoeuvring is based on it.

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14
Q

When is QFE threshold used instead of QFE aerodrome?

A

When the threshold elevation is 7ft or more below aerodrome elevation.

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15
Q

What is an Regional Pressure Setting?

A

The lowest forecast QNH value for an Altimeter Setting Region (ASR)

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16
Q

What is the definition of Level?

A

A generic term relating to the vertical position of an aircraft in flight and meaning variously Height, Altitude or Flight Level.

17
Q

What is the definition of Flight Level?

A

A surface of constant atmospheric pressure, which is related to a specific pressure datum, 1013.2 hPa, and is separated from other such surfaced by specific pressure intervals. (ICAO 4444)

ATC (1 decks)

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