Airworthiness Directive · Amendment 39-16138 · Electrical power
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 applies to the following airplanes, certificated in any category, as identified in the applicable Boeing service bulletin specified in Table 1 of this AD:
| Model— | Boeing— |
|---|---|
| 737-600, -700, -700C, -800, -900 series airplanes | Special Attention Service Bulletin 737-24-1165, Revision 1, dated October 20, 2005. |
| 737-300, -400, -500 series airplanes | Alert Service Bulletin 737-24A1166, Revision 4, dated May 21, 2009. |
| 747-400, -400D, -400F series airplanes | Service Bulletin 747-24-2254, Revision 1, dated March 5, 2007. |
| 757-200, -200CB, -200PF series airplanes | Special Attention Service Bulletin 757-24-0110, Revision 1, dated August 6, 2009. |
| 757-300 series airplanes | Special Attention Service Bulletin 757-24-0111, Revision 1, dated August 6, 2009. |
| 767-200, -300, -300F series airplanes | Special Attention Service Bulletin 767-24-0160, dated June 30, 2005. |
| 767-400ER series airplanes | Special Attention Service Bulletin 767-24-0161, dated June 30, 2005. |
| 777-200, -300, -300ER series airplanes | Service Bulletin 777-24-0095, Revision 1, dated January 3, 2007. |
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.
At the time specified in paragraph (f)(1) or (f)(2) of this AD, as applicable: Modify the static inverter by removing resistor R170 from the logic control card assembly and replacing it with a new resistor, and relocating the new resistor to the solder side of the printed circuit board, in accordance with the Accomplishment Instructions of the applicable service bulletin specified in Table 1 of this AD, except as provided by paragraph (g) of this AD.
(1) For Model 737, 757, and 767 airplanes: Within 42 months after the effective date of this AD.
(2) For Model 747 and 777 airplanes: Within 60 months after the effective date of this AD.
(g) For Group 2 airplanes identified Boeing Special Attention Service Bulletin 767-24-0160, dated June 30, 2005: Airplanes having a static inverter with part number S282T004-2, S282T004-3, or S282T004-4, are not required to do the modification specified in paragraph (f) of this AD.
(h) Actions accomplished before the effective date of this AD in accordance with the applicable Boeing service bulletin specified in Table 2 of this AD, are considered acceptable for compliance with the corresponding actions specified in this AD.
| Boeing — | Revision— | Dated— |
|---|---|---|
| Alert Service Bulletin 737-24A1166 | 3 | July 25, 2007. |
| Special Attention Service Bulletin 757-24-0110 | Original | April 28, 2005. |
| Special Attention Service Bulletin 757-24-0111 | Original | April 28, 2005. |
Note 1: The Boeing service bulletins specified in Table 1 of this AD refer to Avionic Instruments Inc. Service Bulletins 1-002-0102-1000-24-28, Revision A, dated June 22, 2005; and Revision B, dated July 24, 2006; as additional sources of guidance for accomplishing the modification required by paragraph (f) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
