{"id":"F2008L00533","name":"AD/B737/303 Amdt 2 - Fuel Boost Pump Wiring","slug":"ad-b737-303-amdt-2-fuel-boost-pump-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119419,"registerId":"commonwealth-F2008L00533-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/303 Amdt 2 | Fuel Boost Pump Wiring | 3/2008 |\n| ------------------ | ---------------------- | ------ |\n\n| Applicability: | Model 737-100, -200, -200C, -300, -400 and -500 series aeroplanes. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Carry out a detailed inspection for damage of the sleeve and electrical wire of the fuel boost pump in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin (ASB) 737-28A1263 Revision 2 dated 10 August 2007. |\n| | 2. Install new, smaller-diameter sleeving on the fuel boost pump wiring, carry out any related investigative and corrective actions, as applicable, in accordance with ASB 737-28A1263, Revision 2. |\n| | 3. Submit a report of the findings (both positive and negative) of any Requirement 1 inspection and send any damaged parts to the manufacturer, as described in ASB 737-28A1263, Revision 1. The report must include the inspection results, a description of any discrepancies found, the aeroplane serial number together with the number of landings and flight hours on the aeroplane. |\n| | Actions accomplished before 31 August 2007 (the effective date of Amendment 1 of this Directive) in accordance ASB 737-28A1263, dated 19 February 2007, or actions accomplished before 13 March 2008 (the effective date of this Amendment) in accordance with ASB 737-28A1263 Revision 1, are considered acceptable for compliance with the corresponding actions specified in this Directive. |\n| | Later revisions of ASB 737-28A1263, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2007-24-02, are considered acceptable for compliance with the equivalent Requirements of this Amendment. |\n| | Note: FAA AD 2007-24-02 Amdt 39-15268 refers. |\n\n```html\n

Compliance:

For Requirement 1 -

a. Model 737-100, -200, -300, -400 and -500 series aeroplanes having line numbers 1 through 3072 inclusive - Within 120 days after the effective date of this Amendment, or within 5,000 hours time in service (TIS) after the last inspection or repair done in accordance with any version of ASB
737-28A1120 listed in Table 1, whichever occurs later and thereafter, at intervals not to exceed 15,000 hours TIS.

b. Model 737-100, -200, -300, -400 and -500 series aeroplanes having line numbers 3073 and subsequent -

(i) For aeroplanes on which the inspection or repair specified in any version of ASB 737-28A1120 listed in Table 1, has been done as of the effective date of this Amendment - Within 120 days after the effective date of this Amendment or 5,000 hours TIS after the last inspection done in accordance any of the revisions of ASB 737-28A1120 listed in Table 1, whichever occurs later and thereafter, at intervals not to exceed 15,000 hours TIS.

(ii) For aeroplanes on which the inspection or repair specified in any version of ASB 737-28A1120 listed in Table 1, has not been done as of the effective date of this Amendment - Before the accumulation of 5,000 total hours TIS, or within 120 days after the effective date of this Amendment, whichever occurs later and thereafter, at intervals not to exceed 15,000 hours TIS.

c. Model 737-200C series aeroplanes - Within 120 days after the effective date of the original issue of this Directive, or within 5,000 hours TIS since the last inspection or repair done in accordance with any version of Boeing ASB 737-28-1120, whichever occurs later and thereafter at intervals not to exceed 15,000 hours TIS.

Table 1

ASB 737-28A1120 Version

Date

As revised by Notice of Status Change (NSC) as applicable

Number

Date

Original Issue


Revision 1
Revision 2
Revision 3

24 April 1998


28 May 1998
26 November 1998
26 April 2001

NSC 01
NSC 02
NSC 03


7 May 1998
8 May 1998
9 May 1998

\n```\n\n| | For Requirement 2 - Before further flight following the Requirement 1 inspection. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | For Requirement 3 - Within 30 days after the Requirement 1 inspection. |\n| | This Amendment becomes effective on 13 March 2008. |\n| Background: | The original issue of this Directive superseded AD/B737/119 Amdt 3, AD/B737/121 Amdt 2 and AD/B737/138 Amdt 1 which have been cancelled. |\n| | The FAA has advised of a report of a fuel tank explosion on a Model 727-200F aeroplane on the ground together with a report of chafed wires and a damaged power cable sleeve of a fuel boost pump discovered during an inspection on a Model737-300 aeroplane. (The fuel boost pump installation on certain Model 737 aeroplanes is almost identical to the installation on Model 727 aeroplanes.) |\n| | The original issue of this Directive was issued to detect and correct chafing of the fuel boost pump electrical wiring, prevent leakage of fuel into the conduit and to prevent electrical arcing between the wiring and the surrounding conduit, which could result in arc-through of the conduit together with consequent fire or explosion of the fuel tank. |\n| | Amendment 1 resulted from the FAA correcting a typographical error in AD2007-11-07. The repetitive inspection interval is now expressed in hours TIS rather than flight cycles and the requirement for retrospective submittal of inspection reports have been deleted as the compliance time has passed. All other aspects remained unchanged. |\n| | This Amendment follows a superseding AD being issued by the FAA. It reduces the inspection threshold for certain aeroplanes and to avoid confusion, bases the threshold on the completion of service bulletin inspections rather than Airworthiness Directives. |\n| | The original issue of this Directive became effective on 5 July 2007. |\n| | Amendment 1 of this Directive became effective on 31 August 2007. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n23 January 2008","sortOrder":0},{"sectionNumber":"AD/B737/303 Amdt 2","sectionType":"part","heading":"AD/B737/303 Amdt 2","content":"## AD/B737/303 Amdt 2","sortOrder":1},{"sectionNumber":"Fuel Boost Pump Wiring","sectionType":"part","heading":"Fuel Boost Pump Wiring","content":"## Fuel Boost Pump Wiring","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":true,"description":"The original directive (July 2007) was issued to address fuel boost pump wiring chafing and prevent fuel tank explosions. Amendment 1 (August 2007) changed the measurement metric from flight cycles to flight hours and removed retrospective reporting requirements. Amendment 2 (this version, March 2008) further expands the scope by reducing inspection thresholds for certain aircraft and changing the basis for compliance timing from Airworthiness Directives to service bulletin inspections. It also incorporates a new revision of the Boeing service bulletin (Revision 2) and establishes equivalence with updated FAA directives, effectively harmonizing with US regulatory changes rather than maintaining the original standalone Australian approach."},"complexity_factors":["Multiple nested compliance timelines based on aircraft model, production line number, and prior maintenance history","Cross-references to four different versions of Boeing Alert Service Bulletin 737-28A1120 (Table 1) and ASB 737-28A1263 Revisions 1 and 2","Conditional logic with 'whichever occurs later' clauses and retrospective acceptance of prior work done under different versions","Reference to foreign regulatory equivalence (FAA AD 2007-24-02 and AMOC approvals)","Three distinct requirements with different compliance triggers and deadlines","Technical aviation terminology requiring domain knowledge (TIS = Time In Service, ASB = Alert Service Bulletin, AMOC = Alternate Method of Compliance)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections, re-sleeving, and repair of fuel boost pump wiring on certain Boeing 737 (-100/200/200C/300/400/500) to stop chafing that could allow fuel-to-wire arcing and risk tank ignition. \n\nOperators must inspect and fix defects per Boeing SB 737-28A1263 Rev 2 (initial within 120 days or 5,000 fh, then every 15,000 fh), complete repairs before flight, and report results within 30 days."},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Amendment 2 narrows compliance timing by reducing inspection thresholds for certain aeroplanes and bases thresholds on completion of service bulletin inspections rather than earlier AD-based triggers. It retains the core requirement to detect and correct chafed wiring but changes when inspections must occur, accepts earlier compliant actions, and allows later FAA‑approved ASB revisions as alternative compliance methods."},"complexity_factors":["Multiple affected models with a line-number split (line numbers 1–3072 vs 3073+), producing different compliance triggers","Different compliance triggers (120 days, 5,000 hours TIS, or before accumulation of 5,000 hours) depending on prior inspections or repairs","Repetitive inspection interval (15,000 hours TIS) creating ongoing maintenance obligations","Cross-references to multiple Boeing Alert Service Bulletin revisions (including acceptance of later FAA‑approved revisions) and to prior ASBs listed in Table 1","A reporting obligation (positive and negative findings) and requirement to send damaged parts to the manufacturer, adding administrative and logistical burden","Grandfathering of actions done under earlier ASB versions or prior amendment effective dates, increasing compliance-path permutations","References to related FAA ADs and prior cancelled ADs, requiring operators to track multiple external regulatory documents"],"plain_english_summary":"This Directive requires operators of Boeing 737-100/200/200C/300/400/500 series aeroplanes to inspect fuel boost pump wiring sleeves and conductors, install smaller-diameter sleeving where specified, repair any damage, and submit inspection reports and damaged parts to the manufacturer. It prescribes specific compliance windows and recurring inspection intervals, and accepts earlier compliant actions and FAA‑approved service bulletin revisions.\n\nIt affects aircraft operators and maintenance organisations who pay for inspections, repairs and reporting. The measure is intended to reduce the risk of fuel leakage and electrical arcing in fuel tanks by detecting and fixing chafed wiring."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-303-amdt-2-fuel-boost-pump-wiring","history":"/api/acts/ad-b737-303-amdt-2-fuel-boost-pump-wiring/history","analysis":"/api/acts/ad-b737-303-amdt-2-fuel-boost-pump-wiring/analysis","conflicts":"/api/acts/ad-b737-303-amdt-2-fuel-boost-pump-wiring/conflicts","importantCases":"/api/acts/ad-b737-303-amdt-2-fuel-boost-pump-wiring/important-cases","documents":"/api/acts/ad-b737-303-amdt-2-fuel-boost-pump-wiring/documents"}}