Which regulation provides the requirements for placarding inoperative equipment and ensuring compliance before flight?

• A. 14 CFR 39.1
• B. 14 CFR 21.5
• C. 14 CFR 91.213
• D. 14 CFR 23.205

Answer: (C)

When equipment on an aircraft is inoperative, you must treat it as not available for flight and address it before flying. This is governed by a regulation that specifically covers inoperative instruments and equipment. It requires you to either remove the item from service and place a visible placard stating it is inoperative, or, if the item isn’t required for the specific operation, to fly to a place of repair under approved limitations and with the inoperative item properly placarded. This rule ensures that the crew and maintenance know exactly what’s not working and that the aircraft isn’t relied on that item during flight. The other regulations reference different topics (airworthiness directives, definitions, or general equipment requirements) and don’t provide the same placarding and preflight compliance guidance.