1. Introduction
The altimeter setting procedures in use conform to those contained in ICAO DOC 8168 - OPS/61.
Transition altitudes are given in Manual VFR AD 2 for each aerodrome.
QNH reports, temperature information, for use in determining adequate terrain clearance, is provided in MET broadcasts, and is available, on request, from air traffic service units. QNH values are given in hectopascals.
2. Basic altimeter setting procedures
General
No transition altitude is less than 900 M (3000 FT) above an aerodrome.
Vertical positioning of aircraft when at or below the transition altitude is expressed in terms of altitudes, where such positioning at or above the transition level is expressed in terms of flight levels. While passing through the transition layer, vertical positioning is expressed in terms of altitude when descending, and in terms of flight level when ascending
Flight level zero is located at the atmospheric pressure level of 1013.2 HPA (29.92 inHg). Consecutive flight levels are separated by a pressure interval corresponding to 500 FT (152.4 M) in the standard atmosphere
| Location | Transition Altitude (FT) | QNH |
|---|
| <942.2 | 942.2
to
959.4 | 959.5
to
977.1 | 977.2
to
995.0 | 995.1
to
1013.2 | 1013.3
to
1031.6 | 1031.7
to
1050.3 | >1050.3 |
|---|
| Transition Level |
|---|
| S. Jorge AD | 5000 | 85 | 80 | 75 | 70 | 65 | 60 | 55 | 50 |
Take-off and climb
QNH altimeter setting is made available to aircraft prior to take-off.
QFE altimeter setting shall be passed to aircraft on request.
Vertical positioning of aircraft during climb is expressed in terms of altitudes until reaching the transition altitude above which vertical positioning is expressed in terms of flight levels.
Vertical separation en-route
Vertical separation during en-route flight shall be expressed in terms of flight levels at all times.
Approach and landing
A QNH altimeter setting is made available in approach clearances and in clearances to enter the traffic circuit.
A QFE altimeter setting shall be passed to aircraft on request.
The transition level is made available in approach clearances.
Vertical positioning of aircraft during approach is controlled by reference to flight levels until reaching the transition level below which vertical positioning is controlled by reference altitudes.
Missed approach
The relevant portions of paragraphs described above shall be applied to the case of a missed approach.