Airworthiness Directive · Amendment 39-14126 · Boeing Model 747-200F and -400 Series Airplanes; Model 767-400ER Series Airplanes; and Model 777 Series Airplanes
Boeing Model 747-200F and -400 Series Airplanes; Model 767-400ER Series Airplanes; and Model 777 Series Airplanes
This AD applies to the airplanes listed in Table 1 of this AD, certificated in any category:
| Boeing model— | As listed in Boeing service bulletin— |
|---|---|
| 747-200F and -400 series airplanes | 747-25-3313, Revision 1, dated May 15, 2003. |
| 767-400ER series airplanes | 767-25-0335, dated November 7, 2002. |
| 777 series airplanes | 777-25-0210, dated October 17, 2002. |
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-200F and -400 series airplanes; Model 767- 400ER series airplanes; and Model 777 series airplanes. This AD requires replacing the frequency converter(s) used to supply electrical power for utility outlets (for the galley, medical equipment, or personal computers) with modified frequency converter(s). This AD also requires any specified action and related concurrent actions, as necessary. This AD is prompted by a report that a hard short condition between the frequency converter's output and its downstream circuit breakers will produce a continuous current that could cause the undersized output wiring to overheat. We are issuing this AD to prevent the overheating of the frequency converter's undersized output wiring, which could lead to the failure of a wire bundle, and consequent adverse effects on other systems sharing the affected wire bundle.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 18 months after the effective date of this AD, replace the frequency converter(s) used to supply electrical power to utility outlets (for the galley, medical equipment, or personal computers) with modified frequency converter(s); and do other applicable specified actions; by doing all of the actions in the Accomplishment Instructions of the applicable service bulletin listed in Table 2 of this AD.
| For model— | Use Boeing service bulletin— |
|---|---|
| 747-200F and -400 series airplanes | 747-25-3313, Revision 1, dated May 15, 2003. |
| 767-400ER series airplanes | 767-25-0335, dated November 7, 2002. |
| 777 series airplanes | 777-25-0210, dated October 17, 2002. |
Note 1: Boeing Service Bulletin 747-25-3313, Revision 1, dated May 15, 2003, refers to JAMCO Service Bulletin CAW74-25-1697, dated June 7, 2002, as an additional source of information for procedures to remove and install certain galley frequency converters.
For airplanes listed as Group 3 in the Effectivity of Boeing Service Bulletin 777-25-0210, dated October 17, 2002: Prior to or concurrently with the actions in Boeing Service Bulletin 777-25-0210, dated October 17, 2002, deactivate the galley frequency converter in accordance with the Accomplishment Instructions of Monogram Systems Service Bulletin 872869-25-2098, dated May 1, 2002.
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.
Aircraft
