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Slovak Republic

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ENR 1.7  ALTIMETER SETTING PROCEDURES

1.7.1  Introduction

Altimeter setting procedures used in Slovak Republic conform to those contained in ICAO Doc 4444 and Doc 8168.

Transition altitudes are given on Standard Arrival Chart - Instrument (STAR) - ICAO, Standard Departure Chart - Instrument (SID) and Instrument Approach Chart (IAC) - ICAO. QNH values are given in hectopascals. QFE is available on request only. QNH or QFE values when given in hectopascals, are rounded off to the next lower entire hectopascals whilst the term of ”hectopascal” is left out. The term is not left out when broadcasted in other units e.g. milimetres.

1.7.2  Basic altimeter setting procedures

1.7.2.1 General
1.7.2.1.1 Transition altitude is established at 10 000 ft AMSL for entire BRATISLAVA FIR (including TMA).
1.7.2.1.2 Common transition level is established for entire BRATISLAVA FIR (including TMA), based on regional QNH, according to the following table:

Closed QNH interval (hPa)

Transition Level

From

To

943

977

130

978

1013

120

1014

1050

110

1051

1088

100

Transition level is located at least 1 000 ft above the transition altitude to permit the transition altitude and the transition level to be used concurrently in cruising flight, with vertical separation ensured.

1.7.2.1.3 Vertical positioning of aircraft is expressed in terms of:
  1. altitude (ALT) when flying at or below the transition altitude by altimeter setting to QNH,

  2. flight level (FL) when flying at or above the transition level by altimeter setting to 1 013,25 hPa,

  3. height above ground level (AGL)during the en-route flights below 1 000 ft above ground level,

  4. altitude (ALT) when flying in class G airspace above 1 000 ft AGL by altimeter setting to QNH,

  5. height above aerodrome elevation (AAL), by altimeter setting to QFE when required so, on military aerodromes for example.

Note: When flying in uncontrolled airspace of class G bellow TMA vertical positioning of aircraft is expressed in terms of altitude (ALT) by altimeter setting to aerodrome QNH (see para. ENR 1.7.3.2).

While passing through the transition layer vertical positioning is expressed in terms of altitude (ALT) when descending and in terms of flight levels (FL) when ascending.

1.7.2.1.4 Minimum flight altitudes in description of Standard Instrument Departures (SID) ensuring minimum obstacle clearance are indicated in terms of altitude (ft AMSL) even if above transition altitude.
1.7.2.1.5 Flight level zero is located at the atmospheric pressure level of 1 013,2 hPa (29,92 in Hg). Consecutive flight levels are separated by a pressure interval corresponding to 500 ft in the standard atmosphere.
1.7.2.2 Take-off and climb
1.7.2.2.1 QNH altimeter setting is made available to aircraft in taxi clearance prior to 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.
1.7.2.3 Vertical separation - en-route
1.7.2.3.1  Vertical separation during en-route flights is ensured by allocation of different levels for aircraft which shall use prescribed altimeter setting procedures to maintain these levels. Levels of flight are expressed in terms of flight level, altitude or height above ground level.
1.7.2.4 Approach and landing
1.7.2.4.1 QNH setting is made available in approach clearance and in clearance to enter the traffic circuit except when this information has already been received by the aircraft. A transition level will be provided in approach clearance.
1.7.2.4.2 QFE altimeter setting is also made available on request in approach clearance and in take-off clearance.
1.7.2.4.3 Vertical positioning of aircraft during approach is expressed in terms of flight levels until reaching the transition level, below transition level the vertical positioning is expressed in terms of altitudes.

After approach clearance had been issued and the descent to land was started the vertical position of an aircraft can be expressed in altitudes (QNH) provided that level flight above the transition altitude is not indicated or expected.

1.7.2.5 Missed approach
1.7.2.5.1 In case of missed approach the relevant para. ENR 1.7.2.1.3, ENR 1.7.2.2 and ENR 1.7.2.4 will be applied.

1.7.3  Description of altimeter setting region

1.7.3.1 Regional QNH represents the lowest QNH pressure forecasted for entire BRATISLAVA FIR for a period of validity. Regular period of validity is 3 hours from the time of issue. The first regular time of issue is 0000 UTC. In case of unforeseen pressure changes outside of a tolerable range an amended regional QNH is issued. The period of validity of an amendment expires, at the latest, by the next regular time of issue.
1.7.3.2 In cases when altimeter is required to be set to QNH as per ENR 1.7.2.1.3 a), d) the following setting shall be used:
  1. aerodrome QNH within entire area of horizontal boundaries of TMA of controlled aerodrome (including uncontrolled airspace of class G below TMA),

Note: Lower limits of TMAs given by altitude refer to aerodrome (not regional) QNH.

  1. regional QNH in entire BRATISLAVA FIR outside horizontal boundaries of TMA of controlled aerodromes.

1.7.4  Tables of cruising levels

TRACK

From 000 degrees to 179 degrees

From 180 degrees to 359 degrees

IFR Flights

VFR Flights

IFR Flights

VFR Flights

Altitudes

Altitudes

Altitudes

Altitudes

FL

Metres

Feet

FL

Metres

Feet

FL

Metres

Feet

FL

Metres

Feet

-90  ---0   ---
103001 000---206002 000---
309003 000351 0503 500401 2004 000 451 3504 500
501 5005 000551 7005 500601 8506 000652 0006 500
702 1507 000752 3007 500802 4508 000852 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 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 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.