Airworthiness Directive · Amendment 39-15231 · Boeing Model 747 and 767 Airplanes
Boeing Model 747 and 767 Airplanes
This AD applies to the Boeing airplane models identified in Table 1 of this AD, certificated in any category.
| Model— | As identified in Boeing special attention service bulletin— |
|---|---|
| 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes | 747-28-2259, Revision 2, dated July 5, 2007. |
| 767-200, -300, and -300F series airplanes | 767-57-0092, Revision 1, dated February 15, 2007. |
| 767-400ER series airplanes | 767-57-0093, Revision 1, dated February 15, 2007. |
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747 and 767 airplanes. This AD requires reworking the electrical bonding between the airplane structure and the pump housing of the outboard boost pumps in the main fuel tank of certain Boeing Model 747 airplanes, and between the airplane structure and the pump housing of the override/jettison pumps in the left and right wing center auxiliary fuel tanks of certain Boeing Model 767 airplanes. This AD also requires related investigative actions and corrective actions if necessary. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent insufficient electrical bonding, which could result in a potential of ignition sources inside the fuel tanks, and which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane.
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 60 months after the effective date of this AD: Do the actions specified in paragraph (f)(1) or (f)(2) of this AD, as applicable, by accomplishing all the actions specified in the Accomplishment Instructions of the applicable service bulletin specified in Table 1 of this AD. Do any related investigative and corrective actions before further flight.
(1) For Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes: Rework the electrical bonding between the airplane structure and the pump housing of the outboard boost pumps in the main fuel tank, and do related investigative and applicable corrective actions. If any crack, corrosion, or damage is found during the open-hole high-frequency eddy current (HFEC) inspection specified in Boeing Special Attention Service Bulletin 747-28-2259, Revision 2, dated July 5, 2007, and the special attention service bulletin specifies contacting Boeing for repair instructions: Before further flight, repair using a method approved in accordance with the procedures specified in paragraph (h) of this AD.
(2) For Boeing Model 767-200, -300, -300F, and -400ER series airplanes: Rework the electrical bonding between the airplane structure and the pump housing of the override/jettison pumps in the left and right wing center auxiliary fuel tanks, and do the related investigative and applicable corrective actions.
Actions done before the effective date of this AD in accordance with the applicable special attention service bulletins listed in Table 2 of this AD are acceptable for compliance with the corresponding requirements of paragraph (f) of this AD.
| Boeing special attention service bulletin | Revision level | Date |
|---|---|---|
| 747-28-2259 | Original | November 4, 2004. |
| 747-28-2259 | 1 | October 5, 2006. |
| 767-57-0092 | Original | November 4, 2004. |
| 767-57-0093 | Original | November 4, 2004. |
