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Tuesday, November 13, 2007

FAA Maintenance Alerts

Boeing: 737; Cracked Hydraulic Steering Valve Body; ATA 3250. The submitting technician provides sparse descriptions stating, “The body (of this unit) is cracked in the check-valve port, probably caused by overpressure and cyclic stress. (I) recommend redesigning this (component’s) body (housing).” (This steering valve’s manufacturer is listed as Sargent P/N 4129RA9.)

Cessna: 500; Corroded Hydraulic Brake Lines; ATA 3240
A repair station submission observes a corrosion trail that leads to overt brake failure. The writer says, “(We were...) investigating a soft-brake condition when Skydrol was noted leaking from around the belly beacon—its lens was full of fluid. (We) removed the interior and the center aisle floor panels. Hydraulic fluid was noted dripping from the rigid brake line to the right brake (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. This aircraft is not equipped with belly drains. Condensation lies in the belly of the aircraft and the beacon creates heat—(in turn generating) humidity, causing corrosion on component parts in the under-floor area. “Cessna probably should engineer a drainage system of some other method of eliminating the humidity from the under-floor area.”
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