{"id":"F2006B03075","name":"AD/B747/173 Amdt 1 - Fuel Boost and Override/Jettison Pumps","slug":"ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42434,"registerId":"commonwealth-F2006B03075-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/173 Amdt 1 - Fuel Boost and Override/Jettison Pumps","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/173 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.\n\n![](image.001.png)\n\nBoeing 747 Series Aeroplanes\n\nAD/B747/173\n\nAmdt 1\n\n  \nFuel Boost and Override/Jettison Pumps 8/2002\n\nApplicability: All model 747 aeroplanes.\n\nRequirement: 1. Perform an initial visual inspection of the fuel boost and override/jettison pumps wire terminal assembly, electrical connector and wire insulation in accordance with Boeing Service Bulletin (SB) 747-28A2194 Revision 1 dated 18 January 1996 to detect any discrepancies such as fuel leak, heat discolouration and damage, and repetitive inspections unless any of the following conditions are meet:\n\n    For B747-100, -200, -300 and -400 series aeroplanes \\- fuel pumps with ground fault interrupter (GFI) protection installed and Maintenance Planning Data (MPD) documentation is amended to ensure GFI circuits are tested at “C” maintenance check intervals (see Boeing Telex M-7200-02-00852 dated 31 May 2002).\n    For B747-400 series aeroplanes with line number 1294 or greater \\- Hydro-Aire fuel boost pumps part number (P/N) 60B89004-15 and override pumps P/N 60B92603-26 installed (see Boeing Telex M-7200-02-00852 dated 31 May 2002).\n\n    c. For B747-100, \\-200, -300 and -400 series aeroplanes \\- Hydro-Aire fuel boost and override/jettison pumps installed in accordance with Boeing Service Bulletin 747-28A2241 dated 11 June 2002 (see Boeing Telex M7200-02-00939 dated 20 June 2002.\n    2. If a discrepancy is not detected during the Requirement 1 visual inspection, perform an insulation resistance test of each fuel pump’s wiring in accordance with the Accomplishment Instructions of SB 747-28A2194 Rev 1.\n\nNote 1. Each insulation resistance test of the fuel pump wiring includes a continuity check of the fuel pump ground wire, as specifically indicated in the Accomplishment Instructions of the Boeing service bulletin.\n\n    3. If, as a result of the Requirement 2 test, any resistance measurement is found to be less than or equal to one megohm (1 M) replace the fuel pump with a new or serviceable fuel pump in accordance SB 747-28A2194 Rev 1 and repeat the insulation resistance test.\n    4. If, as a result of the Requirement 2 test, all resistance measurements are found to be greater than one megohm (1 M), but one or more resistance measurements are less than five megohms (5 M) either:\n\n    repeat the Requirement 1 visual inspection, or\n\n    b. replace the fuel pump with a new or serviceable fuel pump in accordance SB 747-28A2194 Rev 1 and repeat the insulation resistance test.\n\n    5. If any discrepancy is noted during the Requirement 1 visual inspection, replace the fuel pump with a new or serviceable fuel pump in accordance SB 747- 28A2194 Rev 1 and perform the Requirement 2 insulation resistance test.\n\nNote 2: FAA AD 97-03-17 Amdt 39-9922 together with FAA AMOC Letters 140S-02- 156, 130S-02-253 and 140S-02-191 refer.\n\nCompliance: For Requirement 1 \\- Remains unchanged as “Prior to 14 July 1997 and thereafter at intervals not exceeding 5000 hours time in service (TIS) or 18 months, whichever occurs first”.\n\nRepetitive visual inspections may be terminated if any of the conditions specified in Requirement 1.a., 1.b. or 1.c. are met.\n\nFor Requirement 2 \\- Prior to further flight immediately following the Requirement 1 visual inspection.\n\nFor Requirement 3 \\- Prior to further flight immediately following the Requirement 2 insulation resistance test.\n\nFor Requirement 4.a \\- Within 500 hours TIS after the Requirement 2 insulation resistance test.\n\nFor Requirement 4.b \\- Prior to further flight immediately following the Requirement 2 insulation resistance test.\n\nFor Requirement 5 \\- Prior to further flight immediately following the Requirement 1 visual inspection.\n\nThis Amendment becomes effective on 8 August 2002.\n\nBackground: The original issue of this Directive followed advice from Boeing that operators have reported fuel leaks at the boost and override/jettison fuel pumps. The actions mandated by the initial issue of the Directive were designed to provide early detection of fuel leaks preventing the likelihood of fire in the vicinity of the affected pump.\n\nThis Amendment introduces optional terminating actions for the Requirement 1 repetitive inspections.\n\nThe original issue of this Airworthiness Directive became effective on 27 March 1997.\n\n![Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 28 June 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 17 July 2002.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This amendment adds optional terminating actions for the Requirement 1 repetitive visual inspections (Background). Other requirements (inspections, insulation-resistance tests, replacement criteria and timing) remain in force; applicability continues to cover all model 747 aeroplanes (Applicability; Requirement; Compliance)."},"complexity_factors":["Multiple conditional paths depending on inspection and test outcomes (Requirements 1–5).","Different model/line-number exceptions and terminating actions (Requirement 1.a–1.c and Compliance).","Numeric test thresholds that trigger different remedies (≤1 MΩ; between 1 MΩ and <5 MΩ) (Requirement 3–4).","Varied compliance timing rules (prior to further flight; within 500 hours TIS; recurring every 5000 hours or 18 months) (Compliance).","Mandated replacements and repeat testing when discrepancies or marginal readings occur (Requirements 3–5).","Dependence on external manufacturer documents and service communications (Boeing SB 747-28A2194 Rev 1; SB 747-28A2241; Boeing Telexes cited in Requirement 1 and Notes).","Cross-reference to FAA AD and AMOC letters that may affect acceptable alternatives (Note 2).","Decision points for terminating repetitive inspections introduce operator discretion and recordkeeping demands (Requirement 1 and Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of all Boeing 747 models to inspect fuel boost and override/jettison pump wiring and connectors, carry out insulation-resistance tests, and replace pumps that fail specified resistance thresholds. It affects aircraft operators and maintenance organisations who must follow the inspection, testing, replacement and scheduled-repeat rules; it matters because the directive’s stated purpose is to detect and fix pump fuel leaks that could lead to fire (Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of addressing fuel pump fire risks on Boeing 747 aircraft. It introduces optional terminating actions for repetitive inspections but does not expand the applicability to new aircraft types or introduce unrelated safety requirements. The core safety objective (detecting fuel leaks and electrical faults) remains unchanged from the original 1997 directive."},"complexity_factors":["Multiple nested conditional pathways: Requirements 1-5 create a decision tree with branching outcomes based on test results (visual inspection → insulation test → replacement or re-inspection)","Three separate terminating conditions for repetitive inspections in Requirement 1 (1.a, 1.b, 1.c) with different applicability criteria (aircraft series, line numbers, part numbers)","Cross-references to external documents: Boeing Service Bulletins (747-28A2194 Rev 1, 747-28A2241), Boeing Telexes (M-7200-02-00852, M7200-02-00939), and FAA AD 97-03-17 with associated AMOC letters","Technical measurement thresholds requiring precise interpretation: 'less than or equal to one megohm' vs 'greater than one megohm but less than five megohms'","Multiple compliance timeframes with different triggers: 'prior to further flight', 'within 500 hours TIS', and calendar/flight hour intervals (5000 hours/18 months)","Mixed amendment structure: revokes previous AD but retains original compliance dates and requirements while adding new terminating actions"],"plain_english_summary":"This CASA airworthiness directive targets all Boeing 747s to eliminate a fire hazard from fuel leaks around boost/override/jettison pumps where electrical wiring could ignite spilled fuel. It requires operators to inspect, test and, if necessary, replace affected pumps to ensure safe electrical insulation and no leaks.\n\nAmendment 1 lets operators stop repetitive inspections if they fit approved mitigation—ground-fault interrupters or specified upgraded/newer pump installations—giving airlines the option of ongoing checks or a one-time equipment fix."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps","history":"/api/acts/ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps/history","analysis":"/api/acts/ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps/analysis","conflicts":"/api/acts/ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps/conflicts","importantCases":"/api/acts/ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps/important-cases","documents":"/api/acts/ad-b747-173-amdt-1-fuel-boost-and-override-jettison-pumps/documents"}}