ENR 1.7  ALTIMETER SETTING PROCEDURES

1  INTRODUCTION

1.1 The altimeter setting procedures in use generally conform to those contained in ICAO Doc 8168, Vol III, Section 2 and are given in full below.
1.2 Transition altitudes for all aerodromes are given on the instrument approach charts.
1.3 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 service units.
1.4 QNH values are given in hectopascal (hPa)

2  BASIC ALTIMETER SETTING PROCEDURES

2.1  General
2.1.1 The vertical positioning of aircraft when at or below the transition altitude is expressed in terms of altitude, whereas 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 flight levels when ascending and in terms of altitude when descending.
2.1.2 The change in reference from altitude to flight levels, and vice – versa, is made, when climbing at transition altitude and, when descending at the transition level.
2.1.3 Flight level zero is located at the atmospheric pressure level of 1 013.2 hPa. 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 level

Altimeter indication

Feet

Metres

0101 000300
0151 500450
0202 000600
0505 0001 500
10010 0003 050
15015 0004 550
20020 0006 100
25025 0007 600
30030 0009 150
35035 00010 650
40040 00012 200
45045 00013 700
50050 00015 250
2.2  Take-off and climb
2.2.1 A QNH altimeter setting is made available to aircraft in taxi clearance prior to take-off.
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.
2.3  Vertical separation — En-route
2.3.1 Vertical separation of aircraft during en-route flight at and below the transition altitude is expressed in terms of altitude.
2.3.2 Vertical separation of aircraft during en-route flight above the transition altitude is expressed in terms of flight levels.
2.3.3 QNH altimeter setting reports are provided from ATC units to permit determination of terrain clearance with an acceptable degree of accuracy.
2.3.4 At all times, ATC units have available of transmission to aircraft in flight, on request, the information required to determine the lowest flight level which will ensure adequate terrain clearance for routes or segments of routes on which this information is required.
2.4  Approach and landing
2.4.1 A QNH altimeter setting is made available in approach clearances and in clearances to enter the traffic circuit.
2.4.2 A QFE altimeter setting, clearly identified as such will be provided in approach and landing clearances on request.
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.

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

2.5  Missed approach

The relevant portions of 2.1.2, 2.2 and 2.4 shall be applied in the event of a missed approach.

3  DESCRIPTION OF ALTIMETER SETTING REGION

The altimeter setting regions are Noi Bai, Da Nang and Tan Son Nhat. The areas covered by these regions are shown on the Air Traffic Service Airspace ENR 2.

4  PROCEDURES APPLICABLE TO OPERATORS (INCLUDING PILOTS)

4.1  Flight planning
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 at or above the transition level or the lowest usable flight level, whichever applicable; and

  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.

4.1.2 

The altitudes or flight levels selected for flight:

  1. Shall ensure adequate terrain clearance at all points along the route to be flown;

  2. Shall satisfy air traffic control requirement; and

  3. Shall be compatible with the application of the table of cruising levels as shown in item ENR 1.7.

5  TABLE OF CRUSING LEVELS

5.1  Non-RVSM — FEET
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
0309003 0000351 0503 5000401 2004 0000451 3504 500
0501 5005 0000551 7005 5000601 8506 0000652 0006 500
0702 1507 0000752 3007 5000802 4508 0000852 6008 500
0902 7509 0000952 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 35017 5001805 50018 0001855 65018 500
1905 80019 0001955 95019 5002006 10020 0002056 25020 500
2106 40021 0002156 55021 5002206 70022 0002256 85022 500
2307 00023 0002357 15023 5002407 30024 0002457 45024 500
2507 60025 0002557 75025 5002607 90026 0002658 10026 500
2708 25027 0002758 40027 5002808 55028 0002858 70028 500
2908 85029 0003009 15030 0003109 45031 0003209 75032 000
33010 05033 00034010 35034 00035010 65035 00036010 95036 000
37011 30037 00038011 60038 00039011 90039 00040012 20040 000
41012 50041 00042012 80042 00043013 10043 00044013 40044 000
45013 70045 00046014 00046 00047014 35047 00048014 65048 000
49014 95049 00050015 25050 00051015 55051 00052015 85052 000
etc.etc.etc.etc.etc.etc.etc.etc.etc.etc.etc.etc.

Note 1: For flights operating on airways between North and South, the aircraft will follow the designated flight levels, not depending on the change of the flight heading on each segment. The details are as follows:

  1. For flight from North to South: Even Flight.

  2. For flight from South to North: Odd Flight.

Note 2: The implementation of RVSM FLAS from FL290 up to FL410 is applied in accordance with the provisions of Civil Aviation Authority of Viet Nam.

5.2  RVSM — FEET
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
0103001 000   0206002 000   
0309003 0000351 0503 5000401 2004 0000451 3504 500
0501 5005 0000551 7005 5000601 8506 0000652 0006 500
0702 1507 0000752 3007 5000802 4508 0000852 6008 500
0902 7509 0000952 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 35017 5001805 50018 0001855 65018 500
1905 80019 0001955 95019 5002006 10020 000   
2106 40021 000   2206 70022 000   
2307 00023 000   2407 30024 000   
2507 60025 000   2607 90026 000   
2708 25027 000   2808 55028 000   
2908 85029 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 500    43013 10043 000   
45013 700    47014 35047 000   
49014 950    51015 55051 000   
etc.     etc.     

Note: For flights operating on airways between North - South, the aircraft will follow the designated flight levels, not depending on the change of the flight heading on each segment, the details are as follows:

  1. For flight from North to South: Even flight level.

  1. For flight from South to North: Odd flight level.