When managing inoperative AC packs, which document should be consulted to confirm allowed operations?

• A. AFM
• B. MEL
• C. QRH
• D. FCOM

Answer: (D)

When a system like the air conditioning packs is inoperative, the Flight Crew Operating Manual is the go-to reference for what you are still allowed to do. The FCOM lays out the procedures and limitations for abnormal conditions, including which configurations are permitted, what alternate systems or actions are required, and any flight-phase or performance restrictions that apply. In this context, it tells you how to manage the inoperative packs and what operations remain allowable. While the MEL deals with whether the aircraft can be dispatched with the inoperative equipment, the FCOM specifies the operational envelope and steps once you’re in flight.