Possible Mis-wiring Prompts Citation AD Proposal

AINalerts » October 11, 2005
February 13, 2007, 4:03 AM

A single report of a mis-wired APU fire-extinguishing bottle on a Citation X (Model 750) has prompted a proposed AD to require placing identification sleeves on the positive and negative terminals of APU and main engine fire-extinguishing bottle wiring and reconnecting the wires to the correct terminal studs on Citation 500s, 550s, S550s, 560s, 560XLs and 750s. The fire-extinguishing bottles on these airplanes have positive and negative studs that are the same size, “so it is possible to cross-connect the wiring of the positive and negative leads,” the FAA said. The agency estimates there are about 2,800 of these model airplanes in the worldwide fleet and proposes compliance with the directive within 100 flight hours or 60 days of the effective date of the AD. Comments on the proposal are due November 14. For more information, contact the FAA’s Robert Adamson in Wichita at (316) 946-4145.

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