ENR 1.7  ALTIMETER SETTING PROCEDURES

1.7.1.  Introduction

1.7.1.1 The altimeter setting procedures in use generally conform to those contained in ICAO Doc 8168, Vol. I, Part 6 and are given in full below.
1.7.1.2 Transition altitudes are given in AD 2.17 for each aerodrome. In addition, transition altitudes are given on the Instrument Approach charts of all International Aerodromes.
1.7.1.3 QNH reports and temperature information for use in determining adequate terrain clearance are available on request from the air traffic services units. QNH values are given in HPA.

1.7.2.  Basic altimeter setting procedures

1.7.2.1  General
1.7.2.1.1 A transition altitude is specified for each aerodrome. No transition altitude is less than 450 M (1500 FT) above an aerodrome.
1.7.2.1.2 Vertical positioning of aircraft when at or below the transition level is expressed in terms of altitude. Where such positioning at or above the transition level is expressed in terms of altitude when descending and in terms of flight levels when ascending.
1.7.2.1.3 Flight level zero is located at the atmospheric pressure level of 1 013.2 HPA (29.92 IN). Consecutive flight levels are separated by a pressure interval corresponding to 500 FT (152.4 M) in the standard atmosphere.

Note: Examples of the relationship between flight levels and altimeter indications are given in the following table, the metric equivalents being approximate:

Flight levelAltimeter indication
numberFeetMetres
101000300
151500450
202000600
5050001500
100100003050
150150004550
200200006100
1.7.2.2  Take - off and climb
1.7.2.2.1 A QNH altimeter setting is available prior to taxiing for take-off.
1.7.2.2.2 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.
1.7.2.2.3 A QFE altimeter setting is available on request.
1.7.2.3  Vertical separation - en - route
1.7.2.3.1 Vertical separation of aircraft during en - route flight at and below the transition altitude shall be assessed in terms of altitude.
1.7.2.3.2 Vertical separation of aircraft during en - route flight above the transition altitude shall be assessed in terms of flight levels.
000°-179°180°-359°
IFRVFRIFRVFR
Flight
level
number		10 20 
30354045
50556065
70758085
9095100105
...etc....etc....etc....etc.
270 280 
290 300 
310 320 
330 340 
 ...etc. ...etc. 
 410 430 
 ...etc. ...etc. 
1.7.2.4  Approach and landing
1.7.2.4.1 A QNH altimeter setting is made available in approach clearance and in clearance to enter the traffic circuit.
1.7.2.4.2 QFE altimeter settings are available on request.
1.7.2.4.3 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 to altitudes.
1.7.2.4.4 The transition level is made available in approach clearances.
1.7.2.5  Missed approach

The relevant portions of 1.7.2.2 and 1.7.2.4 shall be applied in the event of a missed approach.

1.7.3.  Description of altimeter setting region(s)

The altimeter setting region is Sal. The area covered by this region is shown on the air traffic services chart ENR 2.

1.7.4.  Procedures applicable to operators (including pilots)

1.7.4.1  Flight Planning

The levels at which a flight is to be conducted shall be specified in a flight plan:

1.7.4.1.1 in terms of flight levels if the flight is to be conducted at or above the transition level; and
1.7.4.1.2 in terms of altitudes if the flight is to be conducted in the vicinity of an aerodrome and at or below the transition altitude.

Note 1: Short flights in the vicinity of an aerodrome may often be conducted only at altitudes below the transition altitude.

Note 2: Flight levels are specified in a plan by number and not in terms of feet or metres as is the case with altitudes.

1.7.5.  Tables of cruising levels

The cruising levels to be observed when so required are as follows:

TRACK
From 000° to 179°From 180° to 359°
IFR FlightsVFR FlightsIFR FlightsVFR Flights
AltitudeAltitudeAltitudeAltitude
FLMetresFeetFLMetresFeetFLMetresFeetFLMetresFeet
-  ---0  ---
103001000---206002000---
309003000351050350040120040004513504500
5015005000551700550060185060006520006500
7021507000752300750080245080008526008500
90275090009529009500100305010000105320010500
110335011000115350011500120365012000125380012500
130395013000135410013500140425014000145440014500
150455015000155470015500160490016000165505016500
170520017000175535017500180550018000185565018500
190580019000195595019500200610020000   
210640021000   220670022000   
230700023000   240730024000   
250760025000   260790026000   
270825027000   280855028000   
290885029000   300915030000   
310945031000   320975032000   
3301005033000   3401035034000   
35010650353000   3601095036000   
3701130037000   3801160038000   
3901190039000   4001220040000   
4101250041000   4301310043000   
4501370045000   4701435047000   
49014 95049000   5101555051000   
etc.etc.etc.   etc. etc.etc.   

 

Note: 1. Some of the lower levels in the above table may not be usable due to terrain clearance requirements.

Note: 2. No VFR flight is permitted above FL 195.

Note: 3. A flight conducted above FL 200 shall be flown in compliance with IFR.

Note: 4. In areas where, on the basis of regional air navigation agreement and in accordance with conditions specified therein, a vertical separation minimum (VSM) of 300 M (1000 FT) is applied between FL 290 and FL 410 inclusive.