Altimetry

Question 1

What is QNH

Answer 1

An atmospheric pressure adjusted to sea level and measured in hPa or millibars so that when QNH is set the altimeter will read elevation AMSL

Question 2

What is Area QNH

Answer 2

An altimeter setting forecast by the BoM and is, within ≥5 hPa, of any actual QNH of any location within a QNH geographical area published in the AIP

Question 3

What is Local QNH

Answer 3

A QNH in an aerodrome TAF, forecast by the BoM or the actual QNH reported by the ATIS, AWIS, CA/GRS, WATIR, AAIS or ATC

Question 4

What is the transition altitude when you are flying within Australian (FIR)

Answer 4

10,000’

Question 5

If you are flying below the transition altitude, set your altimeter using either:

Answer 5

• Set the QNH to the current local QNH of a station along the route within 100 NM of the aircraft
• Current forecast area QNH

Question 6

Specified VFR cruising levels - at or north of 80 degrees south. Even and odd thousands

Answer 6

Even thousands- 180-359
plus 500 to FL 245
Odd thousands- 0- 179
plus 500 to FL 235