For tolerance limits of dimensions of critical structural members, which document should be consulted?

• A. Pilot operating handbook
• B. Aircraft structural repair manual
• C. General safety manual
• D. Structural repair manuals for the specific aircraft model

Answer: (D)

When you’re dealing with tolerance limits for dimensions of critical structural members, you need the exact specifications that apply to the specific aircraft you’re working on. Those tolerances are tied to the aircraft’s design, manufacturing revisions, and any service bulletins, so the document that provides the precise limits and repair procedures for that exact model is the one you must consult. This ensures any measurement or repair keeps the airframe within its certified limits and maintains safety.

A pilot operating handbook covers how the aircraft should be operated, including performance and operating limits, but not the detailed dimensional tolerances for structural members. A general safety manual is too broad and doesn’t include model-specific dimensional tolerances. A generic aircraft structural repair manual can be useful, but it may not reflect the particular geometry, revisions, or modifications of your exact aircraft model. Therefore, the model-specific structural repair manual is the authoritative source for these tolerances.