Getting The Shaft

The following information is derived from the FAA's Service Difficulty Reports and Aviation Maintenance Alerts.


Cessna U206E Stationair

Broken Fuel Selector Shaft

The fuel selector shaft’s top u-joint (p/n 1216608200) was twisted and a tab broke as the pilot was selecting different tank going through the off position, due to stiff fuel selector valve caused by ice buildup on valve.

Part total time: Unknown

Cessna 310K

Cracked Landing Gear Shafts

Installed new shafts (p/n 0894000-12) on both main landing gear at 3520.9 and 100 hours later at 3620.9.  Both shafts were cracked on right side. The new-style shafts have a larger diameter roll pin and this hole is from where the cracks are starting. The new-style shafts are made weaker by having a bigger hole in them.

Part total time: 100.0 hours

Columbia LC41-550FG Columbia 400

Failed Turbocharger Driveshaft

Aircraft was climbing through FL190 when the engine lost power. An emergency descent and unscheduled landing were performed. At lower altitudes, some power was restored. On landing, inspection revealed the shaft between the turbocharger compressor and exhaust wheels had broken in two.

Part total time: 243.0 hours

Diamond DA42-NG

Turbocharger Wastegate Shaft

During a power-on stall, the pilots noticed a partial power loss. When power was added, the left engine went to 45 percent while the right engine was at 100 percent. Cycling the left engine resulted in only 35 percent power out it. The airpl;ane was landed safely. Inspection revealed the waste gate actuator shaft had sheared.

Part total time: 447.0 hours

Partenavia P.68C-TC

Loose Magneto Gear Shaft

Crew encountered no rpm drop during left engine/left magneto check. When the magneto was removed, the plastic gear shaft was found loose, allowing vibration in the fore and aft axis. Magneto replaced.

Part total time: Unknown

Piper PA-28-161 Warrior II/II

Broken Magneto Cam Follower

The aircraft was written up for a power loss. Both magnetos were pulled. Inspection revealed the left magneto’s cam follower shaft had broken. Both mags had oil getting past the oil seal and, as a result, the points were pitted. Magnetos were replaced.

Part total time: 933.5 hours

Piper PA-42 Cheyenne

Sheared Fuel Pump Drive

Just before descent, the left engine lost torque and rpm along with oil pressure. After verifying the failure, the left engine was then feathered and secured. Landed at nearest suitable airport. Left engine fuel pump drive shaft sheared. Fuel pump on the left engine was replaced. 

Part total time: 5259.0 hours


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