Plain English Meaning
A fire that breaks out in or on the airplane while it is flying. It must be dealt with right away, and the pilot needs to get the airplane on the ground quickly.
Full Definition
A fire that occurs aboard an aircraft while it is airborne, originating from sources such as the engine, electrical system, cabin or cockpit equipment, or onboard cargo. It is treated as a time-critical emergency requiring immediate identification of the source, application of the appropriate emergency procedure, and a prompt decision to land as soon as possible.
Context Anchor
Seen in emergency procedure training, ground training, and discussions of how a should respond to , flames, , or a smell during .