Squawk Box

January 2008 Issue

Bent, Corroded, Cracked

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

While investigating a soft-brake condition, Skydrol was noted leaking from around the belly beacon—its lens was full of fluid. After removing the interior and center-aisle floor panels, hydraulic fluid was noted dripping from the rigid right brake line (p/n 90E5517010-64 at fuselage station FS248.1). The Cessna-installed Keith Air Conditioning cold-air duct is Ty-wrapped to the brake fluid lines. The belly beacon is directly below the corrosion and the Skydrol leakage. The aircraft is not equipped with belly drains. The submitter speculates water condenses in the belly of the aircraft and the beacon creates heat—(in turn generating) humidity, causing corrosion on component parts in the underfloor area.

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