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TRANSITION LAYER, ALTITUDEANDLEVEL (AIPENR1.7)
Thesystemof altimetryused inAustraliamakesuseof a transition layer between
the transitionaltitudewhich isalways10000 ft and the transition level of FL110
toseparateaircraft usingQNH from thoseusing1013.2HPaasadatum.
For all operationsatorbelow the transitionaltitude, thealtimeter referencewill be:
• the current local QNH of a station along the routewithin 100nm of the
aircraft; or
• the current Area Forecast QNH if the current Local QNH is not known.
For cruising at and above the transition level, theStandardPressure altimeter
settingof 1013.2HPamust be used.
The positions to change betweenQNH and 1013.2HPa are shown in the
diagram below.
QNH is available from a reporting station, theATIS, TAF, AFOR, AERIS or from
ATS. Cruisingwithin the transition layer is not permitted.
3 – general i nformat i on
altimeter setting rules
TRANSITION LAYER
10000
8000
6000
4000
2000
FL110
TRANSITION
LEVEL
TRANSITION
ALTITUDE
Set 1013.2
Prior to transition layer, set Local QNHor, if not available, AreaQNH
Set Local QNH (if available)
Set AreaQNH just prior to topof climb
ALTITUDES - All operations on Local QNHor Area Forecast QNH
NOTE: local QNHof a station along the routewithin 100nmof theaircraft
Set Local QNH if known, otherwiseaerodromeelevation
MSL
FL125
NOTAVAILABLEWHENAREAQNH ISBELOW963HPA
FL120
NOTAVAILABLEWHENAREAQNH ISBELOW980HPA
FL115
NOTAVAILABLEWHENAREAQNH ISBELOW997HPA
FL110
NOTAVAILABLEWHENAREAQNH ISBELOW1013HPA
ALTIMETRY