AIM 4-6-8

TBL 4-6-1 shows standard phraseology that pilots and controllers will use to communicate in DRVSM operations.

TBL 4-6-8 Pilot/Controller Phraseology Message

Phraseology

For a controller to ascertain the RVSM approval status of an aircraft:

(call sign) confirm RVSM approved

Pilot indication that flight is RVSM approved

Affirm RVSM

Pilot report of lack of RVSM approval (non-RVSM status). Pilot will report non-RVSM status, as follows:

Negative RVSM, (supplementary information, e.g., “Certification flight”).

On the initial call on any frequency in the RVSM airspace and . . ..

(FL 290 - 410).

NOTE-

Pilot report of one of the following after entry into RVSM airspace: all primary altimeters, automatic altitude control systems or altitude alerters have failed.

(See paragraph 4-6-9 , Contingency Actions: Weather Encounters and Aircraft System Failures that Occur After Entry into RVSM Airspace.)

This phrase is to be used to convey both the initial indication of RVSM aircraft system failure and on initial contact on all frequencies in RVSM airspace until the problem ceases to exist or the aircraft has exited RVSM airspace.

Unable RVSM Due Equipment

ATC denial of clearance into RVSM airspace

Unable issue clearance into RVSM airspace, maintain FL

*Pilot reporting inability to maintain cleared flight level due to weather encounter.

(See paragraph 4-6-9 , Contingency Actions: Weather Encounters and Aircraft System Failures that Occur After Entry into RVSM Airspace.).

*Unable RVSM due (state reason) (e.g., turbulence, mountain wave)

ATC requesting pilot to confirm that an aircraft has regained RVSM-approved status or a pilot is ready to resume RVSM

Confirm able to resume RVSM

Pilot ready to resume RVSM after aircraft system or weather contingency

Ready to resume RVSM