Altimeter setting procedures

ENR 1.7 Altimeter setting procedures

1. Introduction

The altimeter setting procedures in use generally conform to those contained in ICAO Doc 8168.

Transition altitudes are given on the instrument approach charts and under AD 2.17.

QNH reports and temperature information for use are provided by automatic terminal information service (ATIS) and are available on request from the air traffic services units. QNH values are given in hectopascals.

2. Basic altimeter setting procedures

2.1 The pilot shall maintain the cruising altitude or flight level of the aircraft, as the case may be, by reference to an altimeter that is set in accordance with the following:

when operating at or above the established transition altitude for that aerodrome, set altimeter to 1013.25hPa (760mmHg);
when operating at or below the established transition level for that aerodrome, set altimeter to the aerodrome QNH and QFE altimeter setting;
when operating between transition altitude and transition level, maintain altitude or flight level as authorised by ATC.

2.2 The pilot shall maintain altimeter setting and flight level as advised by an ATC unit, when flight level is below the departure aerodrome transition altitude and shall set the altimeter to 1013.25hPa (760mmHg) after exits from the controlled area.

2.3 Unless otherwise authorised by ATC unit, pilot-in-command of an aircraft operating within the airspace of Mongolia under VFR and IFR shall not maintain level cruising flight in the transition layer.

3. Description of altimeter setting region

Not applicable.

4. Procedures applicable to operators (including pilots)

4.1 Flight planning

The levels at which a 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;
in terms of altitudes if the flight is to be conducted in the vicinity of an aerodrome and at or below the transition altitude.

5. Table of cruising levels

DIAGRAM OF FLIGHT LEVEL ALLOCATIONS

Note: ATC will issue the Flight Level clearance in meters. Pilot shall use the Mongolia RVSM FLAS Diagram to determine the corresponding flight level in feet. The aircraft shall be flown using the flight level in FEET. Pilots should be aware that due to the rounding differences, the metric readout of the onboard avionics will not necessarily correspond to the cleared Flight Level in meters however the difference will never be more than 30 meters.

180°-359°MAG		000°-179°MAG
Flight Levels		Flight Levels
M	FT	M	FT
15500	50900	14900	48900
14300	46900	13700	44900
13100	43000
		12500	41100
12200	40100	11900	39100
11600	38100	11300	37100
11000	36100	10700	35100
10400	34100	10100	33100
9800	32100	9500	31100
9200	30100	8900	29100

8400	27600	8100	26600
7800	25600	7500	24600
7200	23600	6900	22600
6600	21700	6300	20700
6000	19700	5700	18700
5400	17700	5100	16700
4800	15700	4500	14800
4200	13800	3900	12800
3600	11800	3300	10800
3000	9800	2700	8900
2400	7900	2100	6900
1800	5900	1500	4900
1200	3900	900	3000
M	FT	M	FT

Note: The following vertical separation is required between all flights conducted in the airspace of Mongolia:

300m up to the flight level of 8400m.
500m between the flight levels 8400m and 8900m;
300m between the flight levels 8900m and 12500m;
600m above the flight level 12500m.