Definition
The highest engine power setting permitted by the airplane's manufacturer for a given phase of flight or condition, as published in the Pilot's Operating Handbook (POH) or Airplane Flight Manual (AFM). For takeoff in most piston-engine airplanes, this typically means full throttle with mixture and propeller controls set as specified for the conditions.
Plain English
The most power the engine is allowed to produce in that situation, according to the airplane's official handbook. Going above it can damage the engine or break operating rules; staying below it may not give the airplane the performance it needs.
Context Anchor
Seen in takeoff and climb discussions, especially when maximum performance is needed while still staying within the airplane’s approved limits.
Why Pilots Care
Exceeding this limit can cause engine damage or failure; staying at or below it delivers the performance needed for safe takeoff while protecting the engine.
Intuition Check
Maximum allowable power does not mean any power the engine can physically produce. It means the highest power the airplane’s approved limits allow you to use.
Example Sentence 1
Before releasing the brakes, the pilot advanced the throttle to maximum allowable power and checked the engine instruments were in the green.
Example Sentence 2
During the climb checklist the crew confirmed the engine remained at or below maximum allowable power.