Squawk Box

December 2005 Issue

Squawk Box: 12/05

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

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Cessna 172S
Stall Warning Horn Failure

During the student’s 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....

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