Beech Model 58 Baron Main Landing Gear Actuator 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, 288 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. Part Total Time: 0.0 hours Cessna 172P Bent Carburetor Accelerator Tube The crew made a precautionary landing after they were unable to retard the engine throttle below 2100 rpm. In order to land, the mixture was moved to the idle cutoff position prior to the landing flare. Upon inspection, the accelerator pump discharge tube was found detached from the boss, becoming lodged between the throttle plate and the carburetor throat and inhibiting throttle movement. This carburetor was shipped with an overhauled engine, directly from the manufacturer. Part Total Time: 1203.0 hours Cessna 172S Frayed Aileron Control Cables During a scheduled inspection, the right aileron control cables (p/n 0510105-362 and p/n 0510105-365) were found frayed against the fairlead assembly (p/n 0522647-10) forward of autopilot aileron servo. Part Total Time: 3915.0 hours TCM TSIO-520-R Worn Camshaft Lobes A worn camshaft (p/n 655384) was discovered while changing a cylinder due to low compression. Affected were intake lobes for cylinders #3 and #4. New valve lifters were installed with the new camshaft. Submitter states this is a recurring problem stemming from the manufacturing process. Part Total Time: 402.0 hours TCM IO-550-B Failed A/C Pulley Driveshaft After landing, the pilot noticed oil dripping from the A36 Bonanzas belly. Inspection revealed the air conditioning drive pulley mounted at aft side of starter adapter housing was loose when moved side to side. During removal of the starter adapter, the a/c pulley driveshaft was found sheared inside of the starter adapter housing. When the shaft failed it damaged the shaft oil seal and allowed oil to exit the engine. Only some five quarts of oil remained in the 12-quart engine. The pilot reported oil pressure and temps were in the normal range prior to landing. Part Total Time: 852.0 hours
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:
- Maintenance errors or incomplete documentation, such as a missing washer due to an omitted step in a maintenance manual, can lead to immediate operational issues with critical systems like landing gear actuators.
- Component failures, even on overhauled or relatively new parts, can lead to severe operational problems, including a detached carburetor accelerator tube preventing throttle control or manufacturing defects causing premature engine camshaft wear.
- Wear and tear on control cables and engine accessory drives can result in critical safety hazards, exemplified by frayed aileron cables or a sheared A/C pulley driveshaft causing significant engine oil loss.
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