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Guidance concerning Air Navigation in and above the NAT MNPSA

CHAPTER 5

CHAPTER 5:

OCEANIC ATC CLEARANCES

5.1 GENERAL

5.1.1

Oceanic Clearances are required for all flights within NAT controlled Airspace (at or above

FL55). Pilots should request Oceanic Clearances from the ATC unit responsible for the first OCA within which they wish to operate, following the procedures and the time-frame laid down in appropriate AIPs. Such clearances, although in most cases obtained some time before reaching the Oceanic entry point, are applicable only from that entry point. It is recommended that pilots should request their Oceanic Clearance at least 40 minutes prior to the Oceanic entry point ETA except when entering the Reykjavik area from the Scottish or Stavanger areas, then the clearance should be requested 20 minutes before the Oceanic entry

point ETA.

5.1.2

To assist the OAC in pre-planning optimum airspace utilisation, when requesting an oceanic

clearance the pilot should notify the OAC of the maximum acceptable flight level possible at the boundary, taking into account that a climb to the assigned oceanic flight level must be achieved prior to entering oceanic airspace and normally whilst the aircraft is within radar coverage. The pilot should also notify the OAC of any required change to the oceanic flight planned level, track or Mach Number as early as

practicable after departure. preferred alternative track.

If requesting an OTS track, the clearance request should include the next

5.1.3

Specific information on how to obtain oceanic clearance from each NAT OAC is published

in State AIPs. Various methods of obtaining Oceanic Clearances include:

a) b)

use of published VHF clearance delivery frequencies;

by HF communications to the OAC through the appropriate aeradio station (in accordance with the timeframes detailed in paragraph 5.1.1 above);

c) d)

a request via domestic or other ATC agencies;

by data link, when arrangements have been made with designated airlines to request and

receive clearances using on-board equipment (ACARS).

Detailed procedures

operation

may

vary.

Gander,

Shanwick,

Santa

Maria

and

Reykjavik

OACs

provide

for its such a

facility and the relevant operational procedures are published in NAT OPS Bulletins which are available for download from the

national AIS and also as ICAO Paris website (see

http://www.paris.icao.int/). New York OAC uses oceanic clearances to all aircraft utilising CPDLC.

the

FANS

1/A

CPDLC

function

to

uplink

5.1.4

At some airports situated close to oceanic boundaries or within the NAT Region, it may

be necessary to obtain the Oceanic Clearance before departure. These procedures are detailed in relevant State AIPs, which should be consulted prior to departure. On the east side of the NAT, this will apply to departures from all Irish airfields, all UK airfields west of 2° 30'W and all French Airfields west of zero degree longitude. Oceanic Clearances for controlled flights leaving airports within the region are issued by the relevant ATS unit prior to departure.

5.1.5

If an aircraft, which would normally be RVSM and/or MNPS approved, encounters, whilst

en route to the NAT Oceanic Airspace, a critical in-flight equipment failure, or at dispatch is unable to meet the MEL requirements for RVSM or MNPS approval on the flight, then the pilot must advise ATC at initial

contact when requesting Oceanic Clearance.

NAT Doc 007

25

Edition 2010

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