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During a flight to Europe, planned in MNPS airspace, you expect to cross the 30°W meridian at 1100 UTC. You will then normally be…

  • A
    within the organized night-time flight track system.
  • B
    within the organized daytime flight track system.
  • C
    within the polar track system.
  • D
    out of the validity period of organised flight track system.

NORTH ATLANTIC OPERATIONS AND AIRSPACE MANUAL
CHAPTER 2 THE ORGANISED TRACK SYSTEM (OTS)
2.1 GENERAL

2.1.2 The flight levels normally associated with the OTS are FL310 to FL400 inclusive. These flight levels, and their use have been negotiated and agreed by the NATS ATS providers and are published as the Flight Level Allocation Scheme (FLAS). (See Attachment 5). The FLAS also determines flight levels available for traffic routing partly or wholly outside of the OTS as well as flights operating outside of the valid time periods of the OTS; often referred to as “transition times’.

2.1.3 The hours of validity of the two Organised Track Systems (OTS) are as follows:

(Westbound) Day-time OTS 1130 UTC to 1900 UTC at 30°W
(Eastbound) Night-time OTS 0100 UTC to 0800 UTC at 30°W


A flight to Europe is a eastbound flight. According to the regulation above, 30°W should be crossed between 0100 UTC and 0800 UTC => Therefore, at 1100 UTC, it is out of the validity period of organised flight track system.

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