The Aircraft Flight Manual (AFM) and Pilot's Operating Handbook (POH) are the manufacturer's official documents for a specific aircraft. They contain the performance data, limitations, and procedures a pilot needs to operate that aircraft safely and legally.
How It Works#
The FAA requires most certificated aircraft to carry an approved AFM or POH on board during flight. The two terms are often used interchangeably, but they have a technical distinction. An AFM is a formal FAA-approved document required for aircraft certificated after March 1, 1979. A POH is the manufacturer's handbook format that predates or supplements that requirement, though modern POHs are typically FAA-approved and carry the same legal weight.
Both documents follow a standardized nine-section format established by the General Aviation Manufacturers Association (GAMA). The sections cover general information, limitations, emergency procedures, normal procedures, performance, weight and balance, systems descriptions, handling and servicing, and supplements.
Performance charts are a core feature. They show takeoff distance, climb rate, cruise speed, and fuel burn under specific conditions. These charts are indexed by density altitude, which is the pressure altitude corrected for non-standard temperature. Higher density altitude means thinner air, and thinner air degrades aircraft performance significantly.
Example in Aviation#
A student pilot prepares for a solo cross-country on a hot summer afternoon. The departure airport sits at 3,500 feet MSL (mean sea level), and the temperature is 35°C. She opens the POH to Section 5 and pulls up the takeoff distance chart. After calculating density altitude at roughly 6,200 feet, she finds that her ground roll will be nearly 40% longer than on a standard day. She adjusts her go or no-go decision based on the available runway length. The POH gave her the hard numbers to make that call.
Why It Matters#
The AFM/POH is not optional reading. It is a legal document, and operating outside its stated limitations can void the aircraft's airworthiness certificate. Pilots who skip the POH and rely on memory or general knowledge put themselves at serious risk, especially during high-density-altitude operations or abnormal situations.
For student pilots, building the habit of referencing the POH early pays off throughout a career. Every aircraft type has different limitations, speeds, and quirks. The POH is the one source that accounts for all of them for that specific airframe.
Key Takeaways#
- The AFM/POH is a legal document required on board most certificated aircraft.
- AFMs are FAA-approved; modern POHs typically carry the same legal authority.
- Both follow a standardized nine-section GAMA format.
- Performance charts are indexed by density altitude, not just altitude or temperature alone.
- Always consult the POH before flight, especially in non-standard weather conditions.