Describe line maintenance.

• A. Line maintenance is bench-level tasks performed on the engine outside the aircraft
• B. Line maintenance covers cosmetic cleaning only
• C. Line maintenance includes only documentation
• D. Line maintenance encompasses inspections, parts replacement, and repairs that can be performed while the engine is installed in the aircraft

Answer: (D)

Line maintenance is the set of actions done with the engine installed on the aircraft to keep it airworthy between flights. It includes inspections, servicing, troubleshooting, parts replacement, and repairs that can be completed without removing the engine or performing a major teardown. This work is typically done on the flight line or ramp so the aircraft can return to service quickly. Bench-level tasks performed outside the aircraft, cosmetic cleaning, or just compiling documentation do not represent line maintenance, since they either involve removing the engine, aren’t substantive repairs, or don’t directly restore operational readiness.