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Guidance concerning Air Navigation in and above the NAT MNPSA

CHAPTER 6

6.1.21

On first contact with the initial aeradio stations crews of participating aircraft should expect

to receive the instruction “VOICE POSITION REPORTS NOT REQUIRED”.

6.2

INTER-PILOT AIR-TO-AIR VHF FACILITY 123.45 MHz and EMERGENCY FREQUENCY 121.5 MHz

6.2.1

The frequency 121.5 MHz should be continuously monitored by all aircraft operating in the

NAT Region so as to be prepared to offer assistance to any other aircraft advising an emergency situation.

6.2.2

An air-to-air VHF frequency has been established for world-wide use when aircraft are out

of range of VHF ground stations which utilise the same or adjacent frequencies. This frequency, 123.45 MHz, is intended for pilot-to-pilot exchanges of operationally significant information (N.B. It is not to be

used as a “chat” frequency).

6.2.3

123.45 MHz may be used to relay position reports via another aircraft in the event of an air-

ground communications failure.

6.2.4

This frequency (123.45 MHz) may also be used by pilots to contact other aircraft when

needing to coordinate offsets required in the application of the Strategic Lateral Offset Procedures (SLOP).

6.2.5

If necessary initial contact for relays or offset coordination can be established on 121.5 MHz,

although great care must be exercised should this be necessary, in case this frequency is being used by aircraft experiencing or assisting with an ongoing emergency.

6.2.6

Therefore in order to minimise unnecessary use of 121.5 MHz, it is recommended that

aircraft additionally monitor 123.45 MHz when flying through NAT airspace.

6.3

POSITION REPORTING

Time and Place of Position Reports

6.3.1

Unless otherwise requested by Air Traffic Control, position reports from flights on routes

which are not defined by designated reporting points should be made at the significant points listed in the

flight plan.

6.3.2

Air Traffic Control may require any flight operating in a North/South direction to report its

position at any intermediate parallel of latitude when deemed necessary.

6.3.3

In requiring aircraft to report their position at intermediate points, ATC is guided by the

requirement to have positional information at approximately hourly intervals and also by the need to accommodate varying types of aircraft and varying traffic and MET conditions.

6.3.4

If the estimated time for the ‘next position’, as last reported to ATC, has changed by three

minutes or more, a revised estimate must be transmitted to the ATS unit concerned as soon as possible.

6.3.5

Pilots must always report to ATC as soon as possible on reaching any new cruising level.

Contents of Position Reports

6.3.6

For flights outside domestic ATS route networks, position should be expressed in terms of

latitude and longitude except when flying over named reporting points.

For flights whose tracks are

NAT Doc 007

33

Edition 2010

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