AD/B747/193 Amdt 1 - Fuel Leaks

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Boeing 747 Series Aeroplanes

 

AIRWORTHINESS DIRECTIVE


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.

 

(b) If a valve having P/N 60B92406-161 (ITT P/N 125334-1), P/N 60B92406-81 (ITT P/N 125120-1), or P/N 60B92406-201 (ITT P/N 107970-1) is installed,

accomplish either paragraph 6. or 7. of this AD, as applicable.

 

 

 

(c) If a valve having P/N S343T003-40 (ITT P/N 125334D-1), P/N 60B92406- 161 (ITT P/N 125334-1), P/N 60B92406-81 (ITT P/N 125120-1), or P/N

60B92406-201 (ITT P/N 107970-1) is not installed, accomplish either paragraph 5.(c)(i) or 5.(c)(ii), and either paragraph 6. or 7. of this AD, as applicable.

 

(i)       Replace the valve with a new valve in accordance with the requirements of the service bulletin, or

 

(ii)     Modify the valve body assembly of the fuel system in accordance with the service bulletin.

 

6.    Except as provided in paragraph 7. of this AD, 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 Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8, 1999. If any leak is detected, replace the part with a serviceable part.

 

7.    For aeroplanes having maintenance records that positively demonstrate that the inboard engines have never been located in the outboard positions; perform a one- time general visual inspection to detect fuel leaks of the components between the fuel shutoff spar valve on the outboard engines only, in accordance with Boeing Service Bulletin 747-28A2199, Revision 2, dated July 8, 1999. If any leak is detected, replace the part with a serviceable part.

 

Note 1: For the purposes of this AD, a general visual inspection is defined as : “ A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hanger lighting, flashlight, or droplight, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”

 

Note2: Accomplishment of the actions specified in AMM 71-00-00/501, Test No.2, “ Fuel and Oil Leak Check, “ for Rolls Royce RB211 series engines, and AMM 71-00- 00/501, Test No. 3 “Ground Test - Idle Leak Check (or Idle Power)”, for General Electric CF6-80C and CF6-43/50 series engines, is acceptable for compliance with the actions specified by paragraphs 2 and 3 of this AD.

 

Note3: FAA airworthiness directives AD 98-21-29 amendment 39-10837 and 2000- 14-06 amendment 39-11815 refer.

 

 

Compliance: 1. Within 18 months of 28 January 1999 (unchanged).

 

  1. (b). Before further flight after accomplishment of Requirement 1.

 

2.    Before further flight after accomplishment of requirement 1(b).

 

3.    Before further flight after accomplishment of requirement 1(b).

 

4.    Within 18 months of the effective date of this amended Directive.

 

4.    (b). Before further flight after accomplishment of requirement 4.

 

5.    Within 18 months of the effective date of this amended Directive.

 

5. (b). Before further flight after accomplishment of requirement 5.

 

5.    (c). Before further flight after accomplishment of requirement 5.

 

6.    Before further flight after accomplishment of requirement 5.

 

7.    Before further flight after accomplishment of requirement 5. This amendment becomes effective on 30 November 2000.

Background: Reports indicate that, due to high fuel pressure, certain fuel components of the outboard engines have failed on in-service aircraft. This Directive introduces measures to prevent such high fuel pressure which could lead to the failure of the fuel system components and the possibility of an engine fire.

 

Amendment 1 has been issued to include additional aeroplanes to the AD applicability, the requirements and compliance periods for the additional aeroplanes and to reference FAA airworthiness directive 2000-14-06 amendment 39-11815.

Aeroplanes in compliance with the original issue of the AD are not affected by this AD amendment.

 

The original issue of this airworthiness directive became effective on 28 January 1999.


 

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 24 October 2000

The above AD is notified in the Commonwealth of Australia Gazette on 1 November 2000.

Overview

The Boeing 747 Series Aeroplanes Airworthiness Directive 2000, issued under the Civil Aviation Regulations 1988, was enacted to address the issue of high fuel pressure in certain fuel components of the outboard engines of Boeing 747 series aeroplanes. This problem posed a risk of failure of the fuel system components and the possibility of an engine fire. The Civil Aviation Safety Authority (CASA), through its delegate Eugene Paul Holzapfel, revoked the previous Airworthiness Directive AD/B747/193 and issued this directive to ensure the safety of the affected aircraft. The policy objective of this directive is to mandate specific actions, such as inspections and replacements, to prevent potential fuel leaks and related hazards, ensuring the continued airworthiness of the Boeing 747 series aeroplanes.

Scope and Application

The Airworthiness Directive (AD) issued under subregulation 39.1 (1) of CAR 1998 applies to Boeing 747 series aeroplanes with line numbers ranging from 1 through 1006 inclusive, irrespective of the category in which they are certificated. Specifically, the AD mandates inspections and corrective actions to address potential fuel leaks and related safety issues, particularly concerning the fuel shutoff spar valves and associated components of the outboard engines. The directive applies to aeroplanes powered by General Electric or Rolls Royce engines for line numbers 629 through 1006, and to aeroplanes powered by Pratt and Whitney engines or those with line numbers 1 through 628, where the fuel shutoff spar valves may have been replaced. The AD requires inspections, replacements, or modifications of fuel shutoff spar valves and visual inspections for fuel leaks, with compliance periods set within 18 months from the effective date of the directive and before further flight after the specified actions are taken. This AD does not apply to aeroplanes that have already complied with the original AD issued on 28 January 1999.

Key Provisions

The Airworthiness Directive (AD) AD/B747/193, as amended, addresses specific safety concerns related to fuel leaks in Boeing 747 Series aeroplanes. Specifically, it applies to aeroplanes with line numbers 1 through 1006 inclusive, regardless of their engine type or certification category (s.1). The primary actions mandated by this AD revolve around inspections and, where necessary, replacements or modifications of certain fuel system components to mitigate the risk of fuel leaks and potential engine fires (s.1). The AD requires a one-time inspection to identify the part number of the fuel shutoff spar valves for the outboard engines and, depending on the findings, either no further action, replacement, or modification of these valves (s.1(1)-(2)). It also mandates visual inspections for fuel leaks between the fuel shutoff spar valve and the engine fuel shutoff valve on all four engines or just the outboard engines, depending on the aeroplane's line number and engine type, with any detected leaks to be addressed by replacing the affected parts (s.1(3)-(7)). These actions must be completed in accordance with detailed instructions provided in Boeing Service Bulletins and the Boeing 747 Airplane Maintenance Manual (s.1). The AD imposes specific obligations on the operators and maintainers of affected Boeing 747 Series aeroplanes. These obligations include conducting the prescribed inspections and any necessary replacements or modifications of fuel system components as outlined in the AD (s.1). Operators must ensure that these actions are completed before any further flight of the aeroplane, following the identified requirements (s.1). Additionally, there is a compliance timeline that mandates these actions be undertaken within 18 months from the effective date of the AD or before further flight after specific actions are completed (s.1). Failure to comply with the requirements of this AD can result in serious safety implications, including the potential for fuel leaks leading to engine fires. While the AD itself does not specify penalties for non-compliance, non-compliance with ADs generally can lead to severe consequences under the Civil Aviation Safety Regulations 1998. These can include fines, enforcement notices, or other regulatory actions taken by the Civil Aviation Safety Authority (CASA) to ensure compliance and the maintenance of airworthiness standards. The seriousness of non-compliance underscores the importance of adhering to the AD's stipulations to ensure the safety and airworthiness of the affected aeroplanes.

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Sourced from the Federal Register of Legislation at 26 August 2026. For the latest information on Australian Government law please go to https://www.legislation.gov.au.