Setting QNH on descent
Join Date: Jan 2013
Location: Australia
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From the NZ AIP:
2.2.2 The pilot of an aircraft must:
(a) when climbing above 13,000 ft, set the altimeter to 1013.2 hPa;
and
(b) when descending through FL150, set the altimeter to the
appropriate zone area or aerodrome QNH.
2.2.2 The pilot of an aircraft must:
(a) when climbing above 13,000 ft, set the altimeter to 1013.2 hPa;
and
(b) when descending through FL150, set the altimeter to the
appropriate zone area or aerodrome QNH.
Join Date: Jan 2013
Location: Australia
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To the OP, I withdraw my previous comment about the transition level not changing in Aus. It does with QNH, my bad, you're correct. Been a while since I studied the Aus regs.
Originally Posted by AU AIP ENR 1.7 section 2.1.4
2.1.4 The position to change between QNH and 1013.2HPA shall always be in the Standard Pressure Region on climb after passing 10,000FT and prior to levelling off, or on descent to a level in the Altimeter Setting Region prior to entering the Transition Layer and is shown in Figure 1.
Only half a speed-brake
True mustafagander. Even less, and they do change for QNH less than 1013, and cold temperatures. Some modern ATIS are just METAR announciators and do not have TL info on them. Other places are 7000ish. Elsewhere you could be crusing at FL70 and enter TMA from a side and set QNH for this, as in the TMA TL is FL120. Weird stuff.
Hence the other approach to switch ASAP works the best. To support the risk assesment case, descent to altitude from above, let's say, FL180 is seldom the clearance. Typically last assigned FL is around 120 (whether or not you get to maintain it), mostly because of ATC sector fragmentation which is due to national borders and capacity demands.
Hence the other approach to switch ASAP works the best. To support the risk assesment case, descent to altitude from above, let's say, FL180 is seldom the clearance. Typically last assigned FL is around 120 (whether or not you get to maintain it), mostly because of ATC sector fragmentation which is due to national borders and capacity demands.
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Good airmanship:
Set QNH on SBY Altimeter when received in cruise prior to descent.
When first cleared to an altitude set QNH on main altimeters and crosscheck the value set to be near enough the one set on Stnadby Alreceived during flight to avoid a blunder error.
Set QNH on SBY Altimeter when received in cruise prior to descent.
When first cleared to an altitude set QNH on main altimeters and crosscheck the value set to be near enough the one set on Stnadby Alreceived during flight to avoid a blunder error.
