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1. Air Law > 4) Altimeter-setting Procedures > Flashcards

4) Altimeter-setting Procedures Flashcards

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1
Q

What does QNH mean?

A

The mean sea level pressure at that time causeing the altimeter to indicate altitude

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2
Q

Does the QNH change?

A

Yes the mean sea level changes from place to place and as pressure systems move across the face of the earth

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3
Q

What is altitude?

A

Your height above sea level

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4
Q

What does QFE mean?

A

The pressure level at aerodrome elevation i.e. the highest level on the landing area causing the altimeter to indicate height

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5
Q

When might QFE be used?

A

QFE shows height at an aerodrome elevation so might be used for take offs, curcuits and landings

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6
Q

What does height mean?

A

The vertical distance above a specified point

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7
Q

Can QFE vary over time?

A

Yes the changes will be passed to the pilot by ATC

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8
Q

What affects the QFE?

A

QFE is the highest point on a landing area and might change as aerodromes are at different elevations and different pressures

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9
Q

What is PA?

A

Pressure altitude or Standard Pressure. This is when you set the subscale to 1013.2

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10
Q

When should you set your sub scale to 1013 and above?

A

This is standard procedure at cruising levels where terrain is no longer visible

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11
Q

Does PA change?

A

No. PA is standard pressure

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12
Q

What is the difference between altitude and pressure altitude?

A

Pressure altitude is the altitude divided by 1000 to the nearest 1decimal place 1013.2hPa (which is also refereed to as flight level)
Altitude is your height above mean sea level

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13
Q

If your PA is 3,500 what is your FL?

A

Pressure altitude is 3,500 so your flight flight level is 3.5
PA=3,500 then FA=3.5

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14
Q

Millibar was the old for of hectopascal . So 1mb = __ hPa

A

1mb = 1hPa

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15
Q

What is an ASR?

A

Altimeter setting region

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16
Q

If aircraft are flying in the same ASR will their QNH be the same?

A

Yes. If aircraft are in the same altimeter setting region then their mean sea level pressure should be the same

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17
Q

Do you need to know what altimeter setting region you are in?

A

Yes and you should also know when you are moving from one region to another

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18
Q

What is the RPS?

A

The regional pressure setting is the lowest forecast QNH (height amsl) value for each hour. This ensures a pilot is at or slightly higher than the altitude indicated

19
Q

How often is RPS updated?

A

It is updated every hour by the ATS (air traffic service)

20
Q

When flying below transition level, what is set on the altimeter subscale?

A

QNH (sea level pressure) as it is useful for both seperation from the terrain and seperation from other aircraft

21
Q

What is the transition altitude?

A

The altitude below below which the vertical position of the aircraft is controlled by reference to altitude (QNH) (3,000 ft over most of the UK)

22
Q

When flying well above the terrain and seperation between aircraft is the primary concern, what is the pressure setting?

A

1013.2 hPa (standard pressure)

23
Q

When the term flight level is used, what should be the setting on the altimeter subscale?

A

1013.2 hPa (standard pressure)

This ensures safe vertical seperation between IFR traffic (Instrument Flight Rules)

24
Q

What are transition level, layer and altitude?

A

Transition level - cruise on 1013.2hPa, usually above 3000 ft

Transition layer - between level and altitude
=================================
Transition altitude - use QNH (1030hPa) usually below 3000 ft

25
Q

What is aerodrome QFE?

A

The altimeter indicates height above aerodrome level

26
Q

What is aerodrome QNH?

A

The altimeter indicates the height above mean sea level

27
Q

When is using the height above aerodrome level (with QFE set) useful?

A

Flying in the circuit (i.e. when a 1000 ft circuit is being flown the altimeter displays 1000 ft)

28
Q

When is the altitide (with QNH set) useful?

A

It is useful for terrain and obstacle clearance (ie other aircraft at transition level)

29
Q

When flying in a controlled airspace (aerodrome), what should you use?

A

QNH or QFE for take off and QNH during climb

30
Q

What is QNH?

A

Height above sea level

31
Q

What is QFE?

A

Height above a specific point

32
Q

What is altitude?

A

Height above sea level

33
Q

What hPa is flight level?

A

1013.2 hPa

34
Q

After clearance has been given to climb and you are not below 2000ft of transition level, the altimeter should be set to

A

1013.2hPa (standard pressure) and vertical position should be expressed as flight level i.e. 3500 hPa = 3.5FL

35
Q

What should vertical position be expressed as when outside a controlled airspace?

A

Altitude (QNH) in hPa unless under IFR (instrument flight rules) when vertical position MUST be expressed as flight level

36
Q

What happens if you enter a new regional pressure setting of lower pressure and you dont alter your origional RPS?

A

You will gradually descend

37
Q

What happens if you fly from a RPS where the air is warm to one where the air is cold and dont change your origional rps?

A

You will gradually descend

38
Q

What is the difference between altitude and pressure altitude?

A

Pressure altitude is your height above standard pressure (1013hPa) and Altitude is your QNH (height above sea level)

39
Q

What is a MATZ?

A

Military Air Traffic Zone

40
Q

What is a regional pressure setting?

A

The lowest forecast QNH within an Altimeter Setting Region for each hour

41
Q

What is the purpose of using QNH?

A

For terrain and obstacle clearance

42
Q

What is the purpose of using QFE?

A

For knowing the height above aerodrome level

43
Q

What is the semicircular rule?

A

It is a means of seperating air traffic using magnetic track rather than heading. It is required for IFR and strongly recommended for VFR

1. Air Law (14 decks)

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