Plain English Meaning
Extra pages added to the aircraft's handbook that cover any optional or added-on equipment fitted to that specific aircraft. They tell the pilot how to operate that equipment safely and what rules apply to it.
Full Definition
A section of an aircraft's Pilot's Operating Handbook (POH) or Airplane Flight Manual (AFM) that contains additional operating information, limitations, procedures, and performance data specific to optional equipment, modifications, or systems installed on that particular aircraft. Supplements have the same regulatory weight as the rest of the POH/AFM and must be carried and complied with when the related equipment is installed.
Context Anchor
Seen in the or , especially when the aircraft has added or optional equipment.