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AD/B747/391 - Refuel Valve Control Unit
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/391 | Refuel Valve Control Unit | 5/2009 |
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| Applicability: | 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 aeroplanes, as identified in Boeing Alert Service Bulletin 747-28A2291 Revision 1, dated12 March 2009. |
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| Requirement: | 1. Modify the refuel valve control unit for the reserve fuel tanks, by accomplishing all of the applicable actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 747-28A2291 Revision 1.2. Revise the approved maintenance program by incorporating the information specified in Requirement 2(a) or 2(b) of this AD, as applicable.(a) For Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C,747-200F, 747-300, 747SR, and 747SP series aeroplanes: Incorporate AWL No. 28-AWL-20 of Section D of the Boeing 747-100/200/300/SP Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D6-13747-CMR, Revision January 2007, into the approved maintenance program.(b) For Model 747-400, 747-400D, and 747-400F series aeroplanes: Incorporate AWL No. 28-AWL-25 of Subsection D of the Boeing 747-400 Maintenance Planning Data (MPD) Document, D621U400-9, Section 9, Revision 24, dated June 2006, into the approved maintenance program.Accomplishing the revision in accordance with a later revision of the MPD is an acceptable method of compliance if the revision is approved by the Manager, Seattle Aircraft Certification Office (ACO) of the United States Federal Aviation Administration (FAA).3. No alternative CDCCLs may be used unless the CDCCLs are approved as an AMOC.Terminating Action for Maintenance Program Revision(a) For Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C,747-200F, 747-300, 747SR, and 747SP series aeroplanes: Incorporating AWL No. 28-AWL-20 into the FAA-approved maintenance program in accordance with Requirement 1(a) of AD/B747/379, terminates the action required by Requirement 2(a) of this AD. |
| (b) For Model 747-400, 747-400D, and 747-400F series aeroplanes: Incorporating AWL No. 28-AWL-25 into the approved maintenance program in accordance with Requirement 1(c) of AD/B747/378 terminates the action required by Requirement 2(b) of this AD.Note: FAA AD 2008-18-09 Amdt 39-15666 dated 25 August 2008 refers. | |
| Compliance: | For Requirement 1 - Before 17 October 2013, unless previously accomplished.For Requirement 2 - Concurrently with accomplishing the modification required by Requirement 1 of this AD.For Requirement 3 - After accomplishing the applicable action specified in Requirement 2 of this AD. |