Cessna 172S Skyhawk SP
Improper Manufacturing
Cylinder #4 rocker shaft bushings (p/n 66610) displayed improper interference fit with rocker shaft. Defect found during disassembly phase of overhaul while attempting to remove rocker shaft from cylinder. Probable cause is improper manufacturing.
Part total time: Unknown
Cessna 182Q Skylane
Defective Magneto Drive Bushing
While troubleshooting a failed vacuum pump, removal revealed the drive shaft had melted/burned away, the accessory drive shaft/gear had overheated, the thrust bearing/bushing was galled and the top of housing under the thrust bearing was belled out from excess heat. Magnetos were unaffected. The engine oil and filter were replaced. No metals were noted in the filter material. The manufacturer was notified and supplied replacement parts.
Part total time: 23.0 hours
Cessna 207A
Worn Crankshaft Bushing
The engine had experienced frequent problems throwing alternator belts. No fix was found. The decision was made to have the engine inspected for defects. Found excessively worn crankshaft counterweight bushings. This is believed to be the reason the alternator belt would not operate properly.
Part total time: 561.0 hours
Cessna T210N Turbo Centurion
Loose Fuel Injector Bushings
Fuel injector bushings did not remain in place when fuel injectors were removed for cleaning. This engine has 185 hours SMOH and five out of the six bushings loosened with the injector. Probable cause is that Loctite 620 does not reliably hold the bushings in place.
Part total time: 185.0 hours
Diamond DA20C1
Missing Bushings
Found damage on shock absorber assembly. Damage caused from the top boss contacting the shaft shock absorber shaft. The bushing was discovered missing on three aircraft at the same flight school. The manufacturer was notified of damage, affected parts replaced and the aircraft was returned to service. The quality/airworthiness department is currently reviewing work orders in an effort to isolate aircraft affected by this missing bushing. All three aircraft with missing bushings had between 1300 and 1400 hours total time.
Part total time: 1300-1400 hours.
Diamond DA42
Debonded Bushing
Landing gear cross link joints that were bonded in to the landing gear trailing arm per MSB 42-088/3 and AD 2011-11-07 shifted during normal operation. This resulted in metal-on-metal contact between the landing gear cross links and the trailing arms. Bushing p/n D6032172500.
Part total time: 1844.0 hours
