Who performs trial installations of parts?

• A. The quality assurance office
• B. The base supply office
• C. The Prime unit of the aircraft
• D. The designated maintenance supervisor

Answer: (C)

Trial installations are handled by the Prime unit of the aircraft because they are the team with direct, hands-on responsibility for the airframe and systems and the authority to verify how a part fits and works in real conditions. This unit can assess fit, alignment, clearances, and interfaces with other components, and determine whether the part will operate safely within the aircraft’s environment. They perform the trial to catch any interference, binding, or functional issues before a permanent installation, and they document the results to guide the final decision.

The quality assurance office focuses on verifying that maintenance work meets standards after the fact, not on performing the initial fit tests. The base supply office handles parts provisioning and documentation rather than on-aircraft installation testing. The designated maintenance supervisor may oversee the work but typically does not perform the hands-on trial installation themselves.