Bent, Worn, Missing

The landing gear actuator (p/n 95-810017-23) and motor assembly was removed and replaced with an overhauled unit. While rigging and when gear was extended, the actuator and motor made a slow, deep, grinding noise. Upon inspection, a washer (p/n 105090cr032-4e) was missing. Further investigation revealed the washer was misplaced between the gear actuator housing and spur and pinion gear. The maintenance manual narrative omits installing the washer, though the illustrated parts catalog depicts the washers installation correctly.

Key Takeaways:

• Multiple incidents reported manufacturing or assembly defects in critical engine components, including a bent carburetor accelerator tube and recurring worn camshaft lobes.
• Maintenance documentation discrepancies can lead to significant assembly errors, as seen with a missing washer in a landing gear actuator assembly.
• Component wear and unexpected failures, such as frayed aileron control cables and a sheared A/C pulley driveshaft causing severe oil loss, highlight the need for thorough inspections and robust component design.

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