AIP for Kingdom of Bahrain and State of Qatar (section ENR-1.7) valid from 09 SEP 2021

ENR 1.7 Altimeter setting procedures

1.7.1 INTRODUCTION

The Altimeter setting procedures in use generally conform to those contained in ICAO Doc 8168 - OPS, / 611 Volume 1 and DOC 7030, and are given in full below. QNH reports and temperature information for use in determining adequate terrain clearance are provided in MET broadcasts, and are available on request from Air Traffic Services Units. QNH values are given in whole hectopascals.

1.7.2 BASIC ALTIMETER SETTING PROCEDURES

1.7.2.1 General

1.7.2.1.1 The Transition Altitude is fixed at 13000 FT AMSL for the entire BAHRAIN FIR. The Transition level is fixed at FL 150 for the entire BAHRAIN FIR / BAHRAIN UIR.

1.7.2.1.2 Vertical displacement of aircraft at or below the Transition Altitude is expressed in terms of altitude. Vertical displacement of aircraft at or above the Transition Level is expressed in terms of Flight Levels. While an aircraft is passing through the Transition Layer, vertical displacement is expressed as altitude when descending, and as Flight Levels when climbing.

1.7.2.1.3 Flight Level Zero is located at the atmospheric pressure level of 1013.2 HPA (29.92"). Consecutive Flights are separated by a pressure interval corresponding to 500 FT in the Standard Atmosphere below FL 290, and by a pressure interval corresponding to 1000 FT above FL 290. Simultaneous flight at both the Transitional Altitude and the Transition Level is permissible as a minimum of 1000 FT separation exists between the two layers, however, level flight within the Transition Layer is not permitted.

1.7.2.2 Take - off and climb

1.7.2.2.1 A QNH altimeter setting is made available to aircraft in the routine take - off and climb instructions.

1.7.2.2.2 Vertical displacement of aircraft during the climb is controlled by reference to altitudes until reaching the Transition Altitude, above which vertical displacement is controlled by reference to Flight Levels. In this context, the word "controlled" is used in a composite sense in that a pilot will wish to fly his aircraft at predetermined Flight Levels or altitudes, and Air Traffic Services will wish to advise the pilot of the availability of Flight Levels and altitudes. Both are concerned with the vertical position of aircraft.

1.7.2.3 En - route at and below the transition altitude - altimeter pressure setting

BAHRAIN INTERNATIONAL airport QNH

1.7.2.4 Vertical separation - En-route

1.7.2.4.1 Aircraft shall be flown En-route at Flight Levels at all times when above 13000 FT AMSL.

1.7.2.4.2 When complying with the semi-circular system of cruising levels of Annex 2, an aircraft shall be flown at Flight Levels or Flight Altitudes corresponding to the magnetic track as shown in the following table:

Magnetic Track	000° - 179°		180° - 359°
Flight Rules	IFR	VFR	IFR	VFR
Flight Altitudes		1500	2000	2500
	3000	3500	4000	4500
	5000	5500	6000	6500
	Up to 13000	Up to 11500	Up to 12000	Up to 12500
Flight Levels	150		160
	170		180
	190		200
	Up to 290		Up to 280
	310		300
	330		320
	350		340
	370		360
	390		380
	etc		etc

1.7.2.5 Approach and landing

1.7.2.5.1 A QNH altimeter setting is made available in the routine approach and landing instructions.

1.7.2.5.2 Vertical displacement of aircraft during approach is controlled by reference to Flight Levels until reaching the Transition Level, below which vertical displacement is controlled by reference to altitudes.

Note: This does not preclude a pilot from using a QFE setting to terrain clearance purposes during the final approach of the runway.

1.7.2.6 Missed approach

The relevant portions of ENR 1.7.2.1, ENR 1.7.2.2 and ENR 1.7.2.5 shall be applied to the case of a missed approach..

1.7.3 DESCRIPTION OF ALTIMETER SETTING REGION

There is a single altimeter pressure setting region which covers the entire BAHRAIN FIR / BAHRAIN UIR, however see ENR 1.7.2.2.2.

1.7.4 PROCEDURES APPLICABLE TO OPERATORS, INCLUDING PILOTS

The levels at which flight is to be conducted shall be specified in a Flight Plan;

in terms of Flight Levels, if the flight is to be conducted at or above the Transition Level, and
in terms of altitudes of the flight is to be conducted in the vicinity of an aerodrome, and at or below the Transition Altitude.

Note: Short flights in the vicinity of an aerodrome may often be conducted only at altitudes below the Transition Altitude.

Note: Flight Levels are specified in a plan by number; and not in terms of feet as is the case with altitudes.

1.7.5 TABLE OF CRUISING LEVELS

TRACK
From 000° to 179°						From 180° to 359°
IFR Flights			VFR Flights			IFR Flights			VFR Flights
FL	Altitude		FL	Altitude		FL	Altitude		FL	Altitude
	Metres	Feet		Metres	Feet		Metres	Feet		Metres	Feet
	900	3000		450	1500		600	2000		750	2500
	1500	5000		1050	3500		1200	4000		1350	4500
	2150	7000		1700	5500		1850	6000		2000	6500
	2750	9000		2300	7500		2450	8000		2600	8500
	3350	11000		2900	9500		3050	10000		3200	10500
	3950	13000		3500	11500		3650	12000		3800	12500
150			Class A airspace			160			Class A airspace
170						180
190						200
210						220
230						240
250						260
270						280
290						300
310						320
330						340
350			Class A airspace RVSM applied (See ENR 1.10)			360		Class A airspace RVSM applied (See ENR 1.10)
370						380
390						400
410
450			Class A airspace			430			Class A airspace
490						470
etc.						etc.