What is the minimum certification rating required to perform 100-hour inspections on aircraft instruments?

What is the minimum certification rating required to perform 100-hour inspections on aircraft instruments?

• A. Powerplant rating
• B. Inspection Authorization
• C. Instrument rating
• D. Airframe rating

Answer: (D)

The key is understanding which maintenance tasks a mechanic with a given rating can perform. A 100-hour inspection is a maintenance check that covers the airframe and its systems, including the instruments and related electrical/mechanical components. To perform that work, the technician needs an airframe rating, which authorizes maintenance on the airframe and its systems. A powerplant rating covers the engine and propulsion parts, not the airframe instruments, so it wouldn’t authorize this task. An instrument rating is a pilot certificate, not a maintenance credential, and an Inspection Authorization is an additional endorsement for specific required inspections—not the baseline qualification for a standard 100-hour. So the minimum rating needed is the airframe rating.

The key is understanding which maintenance tasks a mechanic with a given rating can perform. A 100-hour inspection is a maintenance check that covers the airframe and its systems, including the instruments and related electrical/mechanical components. To perform that work, the technician needs an airframe rating, which authorizes maintenance on the airframe and its systems. A powerplant rating covers the engine and propulsion parts, not the airframe instruments, so it wouldn’t authorize this task. An instrument rating is a pilot certificate, not a maintenance credential, and an Inspection Authorization is an additional endorsement for specific required inspections—not the baseline qualification for a standard 100-hour. So the minimum rating needed is the airframe rating.