CIRCUMSTANCE	PHRASEOLOGY
ATC denial of clearance into RVSM airspace	Unable clearance into RVSM airspace maintain (or desc./cl to) FL
Pilot reporting equipment degraded below RVSM requirement.	Unable RVSM due to equipment
Pilot reporting severe turbulence / weather affecting ability to maintain height keeping req.	Unable RVSM due to turbulence
ATC requesting pilot to report when able to resume RVSM	Report able to resume RVSM
Pilot ready to resume RVSM	Ready to resume RVSM