Document ID: chunk:federal_register_of_legislation:F2006B03089:body:0:p1
Version: federal_register_of_legislation:F2006B03089
Segment Type: other
Provision Reference: 
Character Range: 20–2929

AIRWORTHINESS DIRECTIVE

 For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/188 Amdt 2 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

 Boeing 747 Series Aeroplanes

 AD/B747/188
 Amdt 3

              Centre Wing Fuel Tank Override/Jettison Inlet Check Valves

 4/2004

            Applicability: All Model 747 series aeroplanes, line numbers 1 to 1251 inclusive, NOT fitted with centre wing fuel tank override/jettison fuel pumps that have been modified in accordance with Boeing Alert Service Bulletin 747-28A2212, Revision 3, dated 3 August, 2000.

              Requirement: 1. Carry out a detailed inspection for wear or damage of the inlet check valve of the left and right override/jettison pumps of the centre wing fuel tank in accordance with Boeing Alert Service Bulletin (SB) 747-28A2212 Revision 3 and forward results to Boeing as indicated in the same SB page 17(3 F) and page 33 appendix A.

2.         Carry out a detailed inspection for wear or damage of the inlet adapter of the left and right override/jettison pumps of the centre wing fuel tank in accordance with Boeing Alert Service Bulletin 747-28A2212 Revision 3 and forward results to Boeing as required by the same SB page 17(3 F) and page 33 appendix A.

3.         Repeat the inspection requirements of 1 and 2 above; or

4.         For aeroplanes that had accumulated 20,000 total flight hours time-in-service or more as of the effective date of amendment 1 of this Directive, amend the Limitations section of the FAA approved Aircraft Flight Manual (AFM) to include the following procedures:

                 "If the centre tank override/jettison fuel pumps are to be used, there must be at least 17,000 pounds (7,720 kilograms) of fuel in the centre tank prior to engine start. Do not operate the centre tank override/jettison fuel pumps with less than 7,000 pounds (3,200 kilograms) of fuel in the centre tank. For aeroplanes with an inoperative centre tank scavenge system, this 7,000 pounds of centre tank fuel must be considered unusable. If the centre tank override/jettison fuel pumps circuit breakers are tripped, do not reset"; or

5.         Rework the existing pump housing and impeller motor assembly, including replacing the existing inlet check valve and inlet adapter in the centre wing fuel tank with new, improved parts; in accordance