CAP 413
Radiotelephony Manual
Chapter 7 Page 4
1.7
Reduced Vertical Separation Minimum (RVSM) Phraseology
1.7.1
The following phraseology is applicable for RVSM operations:
NOTE:
Should there be reason to believe that an aircraft's declared RVSM status is
in doubt, then the controller shall ask the RVSM status in accordance with in
the table above.
Table 1
Message
Phraseology
(italics indicates a pilot transmission)
To ascertain the RVSM approval status of a
flight
CONFIRM RVSM APPROVED
Pilot indication of RVSM Approved status
Pilot indication of non RVSM approval status
AFFIRM RVSM
NEGATIVE RVSM (supplementary
information e.g. State aircraft)
To deny ATC clearance into RVSM airspace
UNABLE ISSUE CLEARANCE INTO RVSM
AIRSPACE, MAINTAIN [or DESCEND or
CLIMB] (level)
For the case of an individual aircraft reporting
severe turbulence or other severe weather
related phenomenon
UNABLE RVSM DUE TURBULENCE
The phraseology required for a pilot to
communicate those circumstances which
would cause an aircraft's equipment to
degrade to below altimetry Minimum Aircraft
Systems Performance Specification (MASPS)
compliance levels
Note: The phrase is to be used to convey
both the initial indication of the non-altimetry
MASPS compliance and, henceforth, on
initial contact on all frequencies within the
lateral limits of the RVSM airspace until such
time as the problem ceases to exist
UNABLE RVSM DUE EQUIPMENT
To request an aircraft provide information as
soon as RVSM approved status has been
regained or the pilot is ready to resume
RVSM operations
REPORT WHEN ABLE TO RESUME
RVSM
To request confirmation that an aircraft has
regained RVSM approved status or the pilot
is ready to resume RVSM operations
CONFIRM ABLE TO RESUME RVSM
The pilot shall communicate his/her ability to
resume operation within the RVSM airspace
after an equipment related contingency, or
his/her ability to resume RVSM operations
after a weather related contingency
READY TO RESUME RVSM
31 March 2011
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