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, suspected to be due to shear stress from high gear cycles, leading to a trailed but eventually locked landing gear.
- Significant engine component failures included two Superior Air Parts cylinder heads completely separating from an IO-520 engine during takeoff, and a Niagara Air Parts starter clutch failing due to a braised drive gear separating from its shaft.
- Multiple magneto issues were reported, including a TCM S6LSC-25 magneto's plastic cam follower melting at only 9.3 hours, and a TCM S6LSC-204T magneto's nylon distributor gear losing teeth, possibly exacerbated by rotorcraft harmonics.
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