What must be reported if any RVSM required equipment is unserviceable?

• A. Negative RVSM
• B. Positive RVSM
• C. RVSM maintenance required
• D. Request ATC assistance

Answer: (A)

The key idea is that RVSM capability is a specific requirement for operating in RVSM airspace, and when any RVSM-required equipment is not serviceable, you must clearly communicate that you are not RVSM capable. The standard way to do this is to report Negative RVSM to ATC. This tells controllers that the aircraft cannot maintain the required 1000-foot vertical separation in RVSM airspace, so you should be assigned non-RVSM flight levels or routed to avoid RVSM airspace until repairs are completed.

Why the other options don’t fit: saying Positive RVSM would imply you are RVSM-capable, which is opposite of the situation. RVSM maintenance required is a maintenance-status phrase, not the formal ATC-supplied report you broadcast in flight. Request ATC assistance isn’t the specific report indicating unserviceability, and while you can discuss deviations or routing with ATC, the precise reporting phrase in this context is Negative RVSM.