Summary
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900, and 747-400 series airplanes; and Model 757, 767, and 777 airplanes. This AD requires modifying the static inverter by replacing resistor R170 with a new resistor and relocating the new resistor. This AD results from evaluation of the carbon resistor, which revealed a failure mode that can cause the resistor to ignite, involving adjacent capacitors as well. We are issuing this AD to prevent a standby static inverter from overheating, which could result in smoke in the flight deck and cabin and loss of the electrical standby power system.
Directive Details
AD Number
FAA-2009-0911
Document Number
E9-29963
Type
Rule
Publication Date
December 28, 2009
Effective Date
February 1, 2010
Affected Manufacturer
Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900, and 747-400 Series
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2009-0911
Topics
Official Documents
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