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When shall crews report to ATC deviations from the assigned FL, when operating in the NAT HLA?
  • A
    100 ft or more.
  • B
    200 ft or more.
  • C
    300 ft or more.
  • D
    500 ft or more.

NORTH ATLANTIC OPERATIONS AND AIRSPACE MANUAL — CHAPTER 11
Monitoring of Operational Height-keeping Performance

11.3.6 The introduction of RVSM airspace into the NAT region has increased the necessity for consistent and accurate reporting by flight crews and ATC units, of all deviations of 90 m (300 ft) or more from the cleared flight level, whatever the cause.

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