Which form or documentation is applicable to support a major alteration sign-off?

Which form or documentation is applicable to support a major alteration sign-off?

• A. Form 337 or FAA documentation as applicable to support major alteration sign-offs.
• B. A standard purchase receipt.
• C. Pilot’s log entry only.
• D. Maintenance schedule.

Answer: (B)

The key idea is that a major alteration must be documented with an official record that proves the work was designed, approved, and inspected for airworthiness. For major alterations, the proper documentation is FAA Form 337 (or other FAA-approved documentation applicable to the alteration). This form captures what was changed, how it complies with regulatory and design standards, inspection results, and the signatures of the technician and the owner or operator. It becomes part of the aircraft's permanent records and supports the airworthiness sign-off. A standard purchase receipt only shows that a part was bought; it doesn’t indicate that the alteration was designed, approved, or installed in compliance with the rules. A pilot’s log entry records flight time and checks, not the approval of a structural or systems modification. A maintenance schedule is a planning and timing tool, not a record of actual compliance with a major alteration. Therefore, Form 337 or the applicable FAA documentation is the correct choice for supporting a major alteration sign-off.

The key idea is that a major alteration must be documented with an official record that proves the work was designed, approved, and inspected for airworthiness. For major alterations, the proper documentation is FAA Form 337 (or other FAA-approved documentation applicable to the alteration). This form captures what was changed, how it complies with regulatory and design standards, inspection results, and the signatures of the technician and the owner or operator. It becomes part of the aircraft's permanent records and supports the airworthiness sign-off.

A standard purchase receipt only shows that a part was bought; it doesn’t indicate that the alteration was designed, approved, or installed in compliance with the rules. A pilot’s log entry records flight time and checks, not the approval of a structural or systems modification. A maintenance schedule is a planning and timing tool, not a record of actual compliance with a major alteration. Therefore, Form 337 or the applicable FAA documentation is the correct choice for supporting a major alteration sign-off.