Squawk Box

April 2011 Issue

Cracks, Adjustments

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

A 1.5-inch long crack was discovered in the forward firewall doubler (p/n 0753600-24). The crack was located on the lower left quadrant of the doubler, and was centered around the top rivet attaching the parking brake control bracket to the firewall and firewall doubler. When the parking brake handle is pulled, this area of the firewall and doubler flex. The submitter suggests it is very probable that this flexing action has caused this crack.

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