1AD/B747/193 Amdt 1 - Fuel Leaks

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Boeing 747 Series Aeroplanes

AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/193 and issues the following AD under subregulation 39.1 (1) of CAR 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.

AD/B747/193

Amdt 1

Fuel Leaks 12/2000

Applicability: Model 747 series aeroplanes, with line number 1 through 1006 inclusive and certificated in any category.

Requirement: 1. For aeroplanes with line number 629 through 1006 inclusive and powered by General Electric or Rolls Royce engines; perform a one-time inspection to determine the part number of the fuel shutoff spar valve installed for the left- and right-hand outboard engines in accordance with Boeing Alert Service Bulletin 747-28A2199 dated August 1, 1996; Boeing Service Bulletin 747-28A2199, Revision 1, dated October 1, 1998; or Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8, 1999.

(a) If a valve having part number (P/N) S343T003-40 (ITT P/N 125334D-1) is installed, no further action is required by this AD.

(b) If a valve P/N S343T003-40 (ITT P/N 125334D-1) is not installed then either:

(i) replace the valve in accordance with the requirements of the service bulletin, or

(ii) modify the valve in accordance with the requirements of the service bulletin.

2. For aeroplanes with line number 629 through 1006 inclusive and powered by General Electric or Rolls Royce engines: Except as provided for in requirement 3, below, perform a one-time general visual inspection to detect fuel leaks of the components between the fuel shutoff spar valve and the engine fuel shutoff valve on all four engines, in accordance with the applicable section of Chapter 71 of the Boeing 747 Airplane Maintenance Manual (AMM) that pertains to the engines fitted to the aeroplane, or Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8, 1999. If any leak is detected, replace the part with a serviceable part. No further action is required by this AD.

3. For aeroplanes with line number 629 through 1006 inclusive and powered by General Electric or Rolls Royce engines, and having maintenance records that positively demonstrate that the inboard engines have never been located in the outboard position, perform a one-time general visual inspection to detect fuel leaks of the components between the fuel shutoff spar valve and the engine fuel shutoff valve on the outboard engines only, in accordance with the applicable section of Chapter 71 of the Boeing 747 Airplane Maintenance Manual (AMM) that pertains to the engines fitted to the aeroplane, or Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8 1999. If any leak is detected, replace the part with a serviceable part. No further action is required by this AD.

4. For aeroplanes with line number 1 through 628 inclusive, irrespective of engine type fitted; perform a one-time inspection of the maintenance records of the aeroplane to determine if the fuel shutoff spar valve for the left- and right-hand outboard engines has ever been replaced, in accordance with Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8, 1999.

(a) If the maintenance record inspection establishes that neither valve has been replaced, no further action is required by this AD.

(b) If either valve has been replaced, or if the maintenance record inspection does not clearly establish that neither valve has been replaced, accomplish paragraph 5(a), 5(b), or 5(c), as applicable.

5. For aeroplanes with line number 629 through 1006 inclusive and powered by Pratt and Whitney engines, or for aeroplanes having line number 1 through 628 inclusive on which a fuel shutoff spar valve has been, or may have been, replaced; perform a one-time inspection to determine the part number of the fuel shutoff spar valve for the left-and right-hand outboard engines, as applicable, in accordance with Boeing Alert Service Bulletin 747-28A2199, dated August 1, 1996; Boeing Service Bulletin 747-28A2199, Revision 1, dated October 1, 1998; or Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8, 1999.

(a) If a valve having P/N S343T003-40 (ITT P/N 125334D-1) is installed, no further action is required by this AD.