ENR 1.7 ALTIMETER SETTINGS PROCEDURES

 

ENR 1.7.1 Introduction

The altimeter settings procedures in use conform to those contained in ICAO Doc 8168-OPS/611 and are detailed below. For terrain clearance purposes during en-route flight a forecast Regional QNH value is made available. This Regional QNH is calculated as the lowest possible value on the ground anywhere in Iceland. QNH values are given in whole hectopascals.

ENR 1.7.2 Basic Procedures

ENR 1.7.2.1 General

ENR 1.7.2.1.1 .

The transition altitude for Iceland is 7000 feet.

ENR 1.7.2.1.2 .

Vertical positioning of aircraft when at or below the transition altitudes is expressed in terms of altitude whereas such positioning at or above the transition level is expressed in terms of flight levels. 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 positioning of aircraft during descent is expressed in terms of flight level until reaching the transition level below which vertical positioning is expressed in terms of altitudes.

ENR 1.7.2.1.3 .

Flight level zero is located at the atmospheric pressure level of 1013.2 hPa (29.92 INS). Consecutive flight levels are separated by pressure interval corresponding to 500 feet (152,4 meters) in the Standard Atmosphere.

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

Flight Level Number Altimeter Indication
Feet Metres
101000300
151500450
202000600
5050001500
100100003050
150150004550
200200006100

ENR 1.7.2.2 Takeoff and climb

A QNH altimeter setting is made available to aircraft prior to
takeoff.
 

ENR 1.7.2.3 Vertical Separation – En-Route

Vertical separation during en-route flight shall be expressed in terms of flight levels during an IFR flight, when operating at or above the transition level, but altitudes if operated at or below the transition altitude.

When complying with the table of cruising levels an aircraft shall be flown at altitudes or flight levels corresponding to its magnetic track in accordance with the following table:

  TRACK
From 000 degrees to 179 degrees From 180 degrees to 359 degrees
IFR flights VFR flights IFR flights VFR flights
Altitude Altitude
Flughæð/Altitude1 000 2 000   
 3 0003 5004 0004 500
 5 0005 5006 0006 500
 etc.etc.etc.etc.

ENR 1.7.2.4 Approach and Landing

ENR 1.7.2.4.1 .

A QNH altimeter setting is made available in approach clearances and in clearances to enter the traffic circuit.

ENR 1.7.2.4.2 .

Vertical positioning of aircraft during approach is expressed by reference to flight levels until reaching the transition level below which vertical positioning is expressed by reference to altitudes.

ENR 1.7.2.5 Missed approach

ENR 1.7.2.5.1 .

The relevant portions of ENR 1.7.2.1.2 , ENR 1.7.2.2 and ENR 1.7.2.4 shall be applied in the event of a missed approach.

ENR 1.7.3 Description of altimeter setting region

QNH setting areas have not been established in BIRD area. Aircraft flying below transition altitude (7000 feet) shall use local QNH received from the appropriate ATS Unit and change midway to the QNH of the destination aerodrome.

ENR 1.7.4 Procedures applicable for operators (Including Pilots)

ENR 1.7.4.1 Flight Planning

ENR 1.7.4.1.1 .

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

  1. in terms of flight levels if the flight is to be conducted above the transition altitude, and
  2. in terms of altitudes if the flight is to be conducted at or below the transition altitude.

Note: Flight levels are specified in flight plans by numbers, and not in terms of feet or meters as in the case with altitudes.

ENR 1.7.5 Tables of cruising levels

The cruising levels to be observed are as follows:

  1. Within BIRD CTA, a vertical separation minimum of 1000 ft (300 m) is applied at or below FL 410.

TRACK**
From 000 degrees to 179 degrees*** From 180 degrees to 359 degrees***


IFR flights


Altitude


VFR flights


Altitude


IFR flights


Altitude


VFR flights


Altitude
FL Metres Feet FL Metres Feet FL Metres Feet FL Metres Feet
 3001 00 -- 6002 000 --
 9003 000 1 0503 500 1 2004 000 1 3504 500
 1 5005 00 1 7005 500 1 8506 000 2 0006 500
 2 1507 000752 3007 500802 4508 00852 6008 500
902 7509 000952 9009 5001003 05010 0001053 20010 500
1103 35011 0001153 50011 5001203 65012 0001253 80012 500
1303 95013 0001354 10013 5001404 25014 0001454 40014 500
1504 55015 0001554 70015 5001604 90016 0001655 05016 500
1705 20017 0001755 25017 5001805 50018 0001855 65018 500
1905 80019 0001955 95019 5002006 10020 000   
2106 40021 000   2206 70022 000   
2307 00023 000   2407 300 23 24 000   
2507 60025 000   2607 90026 000   
2708 25027 000   2808 55028 000   
2908 85028 000   3009 15030 000   
3109 45031 000   3209 75032 000   
33010 05033 000   34010 35034 000   
35010 65035 000   36010 95036 000   
37011 30037 000   38011 60038 000   
39011 90039 000   40012 20040 000   
41012 50041 000   43013 10043 000   
45013 70045 000   47014 35047 000   
49014 95049 000   51015 55051 000   
etc.etc.etc.   etc.etc.etc.