Who is allowed to reduce the diameter of a type certificated propeller?

Who is allowed to reduce the diameter of a type certificated propeller?

• A. An FAA-certificated propeller repair station with approval for the particular propeller.
• B. The aircraft owner.
• C. The propeller manufacturer.
• D. Any certificated mechanic.

Answer: (A)

Reducing the diameter of a type certificated propeller is an alteration that must be done only under approved data by a facility equipped and authorized to work on that propeller. In this case, the entity that can perform the modification is an FAA-certificated propeller repair station that has current approval for the specific propeller in question. They have access to the necessary repair data, procedures, and capability to ensure the change is within the propeller’s certification, properly documented, and does not introduce unsafe conditions. An aircraft owner cannot legally perform this modification because it requires specific approved data and an authorized repair facility. A blanket authorization for a general certificated mechanic is not sufficient, since making a diameter change on a type certificated propeller is a major alteration with significant impact on balance, structural limits, and performance. The propeller manufacturer could perform the work if they have the appropriate data and authorization, but the most direct and correct answer describes the entity that is expressly authorized to perform this kind of repair work: an FAA-certificated propeller repair station with approval for that particular propeller.

Reducing the diameter of a type certificated propeller is an alteration that must be done only under approved data by a facility equipped and authorized to work on that propeller. In this case, the entity that can perform the modification is an FAA-certificated propeller repair station that has current approval for the specific propeller in question. They have access to the necessary repair data, procedures, and capability to ensure the change is within the propeller’s certification, properly documented, and does not introduce unsafe conditions.

An aircraft owner cannot legally perform this modification because it requires specific approved data and an authorized repair facility. A blanket authorization for a general certificated mechanic is not sufficient, since making a diameter change on a type certificated propeller is a major alteration with significant impact on balance, structural limits, and performance. The propeller manufacturer could perform the work if they have the appropriate data and authorization, but the most direct and correct answer describes the entity that is expressly authorized to perform this kind of repair work: an FAA-certificated propeller repair station with approval for that particular propeller.