Squawk Box

May 2009 Issue

Cracked, Loose, Failed

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

New deice boots were installed on all three blades of this Hartzell propeller, which later was mounted by the owner’s mechanic. One of the three boots came off after approximately seven hours of flying, resulting in a dent on the aircraft fuselage. When installing a new boot on the propeller, we observed the adhesive did not separate from the blade. The boots on this propeller are long strap boots. If properly positioned during spinner installation, it remains contained within the spinner. Since the two remaining boots remained attached, it is likely the boot strap was not positioned properly during spinner installation, resulting in the boot separating from the blade. Goodrich p/n 4E1188-3.

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