What four pieces of equipment must be installed and operational in the aircraft prior to entering RVSM?

Regulatory Requirements
  • Two independent altitude measurement systems;
  • An altitude alerting system;
  • An automatic altitude control system; and.
  • A secondary surveillance radar (SSR) transponder with altitude reporting system that can be connected to the altitude measurement system in use for altitude keeping. (IR-OPS SPA.




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Operating in RVSM airspace requires a working autopilot at all times. An autopilot failure leads to the loss of RVSM capability.

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A few pieces of equipment are crucial for flying in this airspace. For example, a two-way radio is the most significant requirement without which no entry is permitted to the airspace. Furthermore, an altitude-reporting transponder with ADS-B Out is required for two purposes: To provide separation within the class.

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§ 91.205 Powered civil aircraft with standard category U.S. airworthiness certificates: Instrument and equipment requirements.
  • (1) Airspeed indicator.
  • (2) Altimeter.
  • (3) Magnetic direction indicator.
  • (4) Tachometer for each engine.
  • (5) Oil pressure gauge for each engine using pressure system.


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