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AD/B747/272 Amdt 1 - Thrust Reverser Directional Pilot Valve
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/272 Amdt 1 | Thrust Reverser Directional Pilot Valve | 3/2008 DM |
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| Applicability: | Model 747 series aeroplanes with General Electric CF6-80C2 series engines. |
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| Requirement: | 1. (a) For aeroplanes not modified in accordance with Boeing Service Bulletin (SB) 747-78-2151 or production equivalent, carry out and successfully accomplish a functional test of the Directional Pilot Valve (DPV) of the thrust reversers to detect pneumatic leakage, in accordance with Boeing Alert SB747-78A2170 dated 21 October 1999.(b) For aeroplanes modified in accordance with Boeing SB 747-78-2151 or production equivalent, carry out and successfully accomplish a functional test of the DPV of the thrust reversers to detect pneumatic leakage, in accordance with Boeing Alert SB 747-78A2170 dated 21 October 1999.2. Repeat and successfully accomplish a functional test of Requirement 1(a).3. Repeat and successfully accomplish a functional test of Requirement 1(b).4. If any functional test required by Requirement 1, 2 or 3 of this Directive cannot be successfully carried out in accordance with the reference service bulletin, or if any discrepancy is detected during any functional test, repair in accordance with the Aircraft Maintenance Manual.5. Repeat Requirement 1 functional tests if any discrepancies have been corrected under Requirement 4 during compliance with Requirement 1, 2 or 3.Production Equivalent Functional tests accomplished in accordance with a production equivalent for aeroplanes modified during production are acceptable as equivalent to the initial functional test required by Requirement 1(b) of this Directive. Therefore, in this case, compliance with Requirement 1(b) is not necessary.Later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2000-17-06 are considered acceptable for compliance with the equivalent Requirements of this Directive.Note: FAA AD 2000-17-06 Amdt 39-11880 refers. |
| Compliance: | For Requirement 1:(a) Remains unchanged as detailed in the original issue of this Directive as: Within 30 days after 5 June 2002 (the effective date of the original issue of this Directive) unless previously accomplished.(b) Remains unchanged as detailed in the original issue of this Directive as: With the exception of aeroplanes modified and functionally tested in accordance with a production equivalent, within 60 days after 5 June 2002, unless previously accomplished.For Requirement 2: At intervals not exceeding 1,000 flight hours.For Requirement 3: At intervals not exceeding 6,000 flight hours.For Requirement 4: Prior to further flight after the effective date of this Directive.For Requirement 5: Prior to further flight after the effective date of this Directive |
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