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You are flying FL330 and about to enter NAT airspace. You receive the following NAT route clearance from the ATC:

"Speedbird 69 cleared to London Heathrow via Track WHISKEY, cross PILLU FL350, Mach .83, request FL350". Regarding climb from FL330 to FL350 the correct answer is:

  • A
    You can start climb after passing PILLU.
  • B
    You can commence climb freely anytime before PILLU.
  • C
    You must obtain separate clearance from ATC to commence climb.
  • D
    You must immediately commence climb.

NORTH ATLANTIC OPERATIONS AND AIRSPACE MANUAL
CHAPTER 5: OCEANIC ATC CLEARANCES

5.1.9 Furthermore it must be recognised that if the entry point of the oceanic route on which the flight is cleared differs from that originally requested and/or the oceanic flight level differs from the current flight level, the pilot is responsible for requesting and obtaining the necessary domestic re-clearance to ensure that the flight is in compliance with its Oceanic Clearance when entering oceanic airspace.

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