What document would you use to find the part number for a landing light bulb for an airplane?

• A. The illustrated parts catalog.
• B. The weight and balance manual.
• C. The maintenance manual.
• D. The structural repair manual.

Answer: (A)

Locating a specific replacement part number is handled by the illustrated parts catalog, which provides exploded views and a bill of materials for each aircraft system. In the IPC, you’ll find the lighting section with the landing light or lamp assembly shown in a diagram, and the exact part number listed for the bulb or assembly that matches your aircraft model. It may also show interchangeable numbers and cross-references, so you can order the correct item with confidence.

The other manuals serve different purposes and don’t focus on identifying replacement parts. The weight and balance manual deals with aircraft weight and center of gravity, not part numbers. The maintenance manual covers procedures, parameters, and inspection criteria. The structural repair manual provides repair methods and limits for the airframe. None of those are intended to catalog parts or their numbers.