Document ID: chunk:federal_register_of_legislation:F2008L00152:body:0:p1
Version: federal_register_of_legislation:F2008L00152
Segment Type: other
Provision Reference: 
Character Range: 0–3262

AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/272 and issues the following AD under subregulation 39.001(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/B747/272 Amdt 1  Thrust Reverser Directional Pilot Valve  3/2008 DM

Applicability:  Model 747 series aeroplanes with General Electric CF6-80C2 series engines.
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