ICAO Controller/Pilot Procedures for Non-RVSM Approved Aircraft during Operations in or Vertical Transit through RVSM Airspace

[Reference: ICAO "Procedures for Air Navigation Services - Air Traffic Management" (Doc 4444)]

1. During operations in or vertical transit through RVSM airspace with aircraft not approved for RVSM operations, pilots shall report non-approved status using the phraseology NEGATIVE RVSM [with supplementary information if applicable, e.g. State Aircraft] as follows:

a) at initial call on any channel within RVSM airspace;

b) in all requests for level changes; and

c) in all read-backs of level clearances.

2. Air traffic controllers shall explicitly acknowledge receipt of messages from aircraft reporting RVSM non-approved status.

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