Which aircraft are not permitted within RVSM level bands (between FL290 and FL410)?

• A. Civil formation flights
• B. Commercial airliners
• C. Military fighters
• D. General aviation single-engine

Answer: (A)

RVSM requires precise and continuous vertical separation of 1000 feet between aircraft operating from FL290 to FL410. This level of accuracy depends on each airplane being RVSM-certified and equipped with reliable altitude-keeping systems, two independent pressure sources, and a functioning altitude-reporting transponder. Civil formation flights involve multiple aircraft flying in very close proximity, often at the same or nearly the same altitude. That setup makes it practically impossible to guarantee the mandated 1000-foot vertical separation between each aircraft, introducing a safety risk that conflicts with RVSM standards. Because of this, civil formation flights are not allowed in RVSM level bands. Other aircraft types can operate there if they are properly equipped and cleared for RVSM, such as commercial airliners, military fighters, and general aviation aircraft that meet the certification and equipment requirements.