Which publication should the Captain consult to determine if the aircraft is authorized to depart with a missing or nonfunctional safety equipment item?

Which publication should the Captain consult to determine if the aircraft is authorized to depart with a missing or nonfunctional safety equipment item?

• A. Aircraft Maintenance Manual
• B. MEL 4.2.5
• C. Pub 123 3.6.1
• D. Flight Operations Manual

Answer: (B)

The ability to depart with a missing or nonfunctional safety item is governed by the Minimum Equipment List. The MEL specifies exactly which items may be inoperative and the conditions under which a flight can still operate, including any required procedures or placards. In this scenario, the Captain checks the MEL, specifically the section that covers inoperative safety equipment (like 4.2.5), to determine if the airplane is legally and safely cleared to fly and what actions must be taken. The Aircraft Maintenance Manual is about how to repair or replace equipment, not about dispatch authorization. The Flight Operations Manual provides general procedures but relies on the MEL for the specific inoperative-equipment decision. The other publication isn’t the standard source for this determination.

The ability to depart with a missing or nonfunctional safety item is governed by the Minimum Equipment List. The MEL specifies exactly which items may be inoperative and the conditions under which a flight can still operate, including any required procedures or placards. In this scenario, the Captain checks the MEL, specifically the section that covers inoperative safety equipment (like 4.2.5), to determine if the airplane is legally and safely cleared to fly and what actions must be taken. The Aircraft Maintenance Manual is about how to repair or replace equipment, not about dispatch authorization. The Flight Operations Manual provides general procedures but relies on the MEL for the specific inoperative-equipment decision. The other publication isn’t the standard source for this determination.