When reviewing major alterations, which document should be consulted to confirm the alteration's installation limitations and design data?

When reviewing major alterations, which document should be consulted to confirm the alteration's installation limitations and design data?

• A. STC
• B. Form 337
• C. Type Certificate Data Sheet
• D. Manufacturer's Manual

Answer: (C)

When you review a major alteration, you must verify that its installation complies with the official data that governs the aircraft’s design. The Type Certificate Data Sheet is the primary source for that information. It defines the approved configuration, performance, and, crucially, the installation limitations and design data that apply to the model. Any modification’s feasibility and methods should be checked against the data referenced or incorporated by the TCDS, including any STC that may exist for the modification. The Form 337 is the FAA’s record of the change itself, documenting what was done, but it does not provide the design data or the installation limits. The Manufacturer’s Manual offers general guidance, but it does not replace the approved data that actually governs the alteration’s proper installation.

When you review a major alteration, you must verify that its installation complies with the official data that governs the aircraft’s design. The Type Certificate Data Sheet is the primary source for that information. It defines the approved configuration, performance, and, crucially, the installation limitations and design data that apply to the model. Any modification’s feasibility and methods should be checked against the data referenced or incorporated by the TCDS, including any STC that may exist for the modification. The Form 337 is the FAA’s record of the change itself, documenting what was done, but it does not provide the design data or the installation limits. The Manufacturer’s Manual offers general guidance, but it does not replace the approved data that actually governs the alteration’s proper installation.