Under general certificate privileges, 100 hour inspections may be performed on which component?

• A. Instruments
• B. Engines
• C. Airframes
• D. Propellers

Answer: (A)

The main idea here is that general certificate privileges cover maintenance on certain aircraft components classified as appliances, rather than the major airframe or powerplant systems. A 100-hour inspection is a routine check required for aircraft used for hire, and who can perform it depends on having the appropriate rating for the component being inspected.

Instruments are considered appliances, and under general certificate privileges a mechanic can perform inspections on those components. Airframes, engines, and propellers require specific ratings (airframe, powerplant, or propeller) to be addressed in a 100-hour inspection. Since the question asks about what can be done under general privileges, instruments best fit that scope.