Squawk Box

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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Cessna 172S
Stall Warning Horn Failure
During the students first stall practice, the warning horn failed to operate through the full stall and the CFI halted the maneuver. Troubleshooting confirmed the warning horn assembly (p/n 0713348-1) was defective. The failed unit was replaced with a new (assembly), and a maintenance operational check and test flight were completed. A second 172 aircraft (of three) had the identical problem…at 491.5 hours. The part was replaced twice because the first new part failed during testing. A third aircraft has 417….

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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Beechcraft G33
Nose Gear Steering Rod-End
A mechanic describes finding the rod-end (p/n 35-820045) loose on the nose gear steering push-pull tube (p/n 35-825044-6). This connecting terminal slides into the tubes end and is mechanically fastened by two 5/32-inch solid rivets clocked at 90 degrees. (The) rivets were not properly driven due to (compression) inside the hollow portion of the tube, instead of (compressing) at the shop head, allowing the rod-end to come loose. Separation would cause loss of nose steering control. I recommend replacement o…

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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Cessna 150
Lost Rudder Hinge Bolt
The upper rudder pivot bolt backed out of its self-locking nutplate at the upper hinge while in flight. The rudder was ripped from the lower bell crank control, and departed the aircraft. The aircraft landed without incident.The rudder was found and its upper pivot bolt was retained in the rudder cap. The bolt could be inserted in the nutplate with light, finger pressure only, and removed the same way.The nutplate was worn and had lost its locking ability. At installation of a factory new rudder assembly, a drilled…

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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American General AG-5B
Seatbelt Doubler Installation
While replacing the rear passenger seatbelts, it was discovered the p/n 5102330-6 reinforcement plate had been installed on the forward side of the aft seat bulkhead under the seatbelt attach bracket. The -6 plate should have been installed on the aft side of the bulkhead in accordance with AG Drawing 5102299. Furthermore, an MS20364-1032 (thin shear nut) was used to secure the AN3-5A retaining bolts. MS 20365-1032 or MS21042-3 nuts should have been installed as called out on the drawing. This arra…

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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Cessna R182
Nose Gear Extension Failure
The aircraft sustained nose damage due to the nose gears failure to extend for landing. The propeller linkage runs down the outside of the nose landing gear tunnel, and is attached in two places with Adel clamps, stand-offs and AN-3 bolts. The aft attach hole is directly in line with the nose door actuator arm, p/n 2213022-14. This aircraft had the aft AN-3 bolt installed with the threads and nut protruding into the wheelwell. The hollow actuator arm impacted the protruding bolt, loosening it with each gear cy…

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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Aeronca 7 AC
Cracked Wing Ribs
The submitter describes finding a crack in both the left and right wings number one rib located inboard of the ailerons. These ribs were …cracked along the radius of the attach tab where the rib is secured to the aft spar. This aircraft was subjected to years of prevailing winds quartering against the trailing edge of the left aileron. No gust locks were utilized. The ribs were repaired and wings recovered. The owner has erected a more suitable shelter.Part Total Time: unknown.

Aeronca;11 CC
Cracked Rear…