The following information is derived from the FAAs Service Difficulty Re-ports and Aviation Maintenance Alerts. Cessna 172RG Cracked Landing Gear Actuator The l/h main landing gear failed to extend, but trailed. The pilot was able to rock it into the down and locked position and make a safe landing. Inspection revealed the (p/n 1281001-3) actuator body had cracked clear through the forward attach hole and half-way through the aft attach hole. This damage is unrelated to the condition addressed in service bulletin SEB01-2. The submitters suspect failure of the actuator body may have resulted from shear stress on (its) attach bolt holes due to the high number of gear cycles over the life of the aircraft. Part Total Time: 7005.9 hours. Superior Air Parts Blown Cylinder Heads Both cylinders (p/n SA52000-A20P) installed on an IO-520 in a Cessna 206 failed at takeoff power settings within two hours of each other. In both instances, the 288
Cracks, Jugs And Mags
The l/h main landing gear failed to extend, but trailed. The pilot was able to rock it into the down and locked position and make a safe landing. Inspection revealed the (p/n 1281001-3) actuator body had cracked clear through the forward attach hole and half-way through the aft attach hole.
Key Takeaways:
- A Cessna 172RG experienced a cracked main landing gear actuator body, suspected to be due to shear stress from high gear cycling over the aircraft's life.
- An IO-520 engine in a Cessna 206 suffered complete separation of both Superior Air Parts cylinder heads from the barrel at takeoff power settings.
- Multiple magneto failures were reported, including a melted plastic cam follower at very low hours and broken distributor gear teeth, potentially exacerbated by rotorcraft harmonics.
- A Niagara Air Parts starter clutch failed due to insufficient braising attaching the drive gear to the shaft, highlighting a manufacturing inadequacy for high-torque applications.
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