AD NUMBER: AD 2009-26-03

MANUFACTURER: Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900, and 747-400 Series Airplanes; and Model 757, 767, and 777 Airplanes
SUBJECT: Airworthiness Directive AD 2009-26-03

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.

DATES: This AD becomes effective February 1, 2010. The Director of the Federal Register approved the incorporation by reference of certain publications listed in the AD as of February 1, 2010.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/list/2009-26-03?OpenDocument