{"id":"F2006B08299","name":"AD/CESSNA 400/112 Amdt 1 - Fuel Boost Pump Wiring","slug":"ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115631,"registerId":"commonwealth-F2006B08299-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/112 Amdt 1 - Fuel Boost Pump Wiring","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CESSNA 400/112 and issues the following AD under subregulation 39.1 (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.\n\n![](image.001.png)  \n\nCessna 400 Series Aeroplanes\n\nAD/CESSNA 400/112\n\nAmdt 1\n\n  \n\nFuel Boost Pump Wiring 11/2003 DM\n\nApplicability: Model 441 aeroplanes, serial numbers 0001 through 0362 and 0698.\n\nRequirement: 1. Inspect part number (P/N) 5718106-1 wire harnesses and fuel boost pump lead wires for chafing or damage in accordance with Cessna Conquest Service Bulletin (SB) CQB02-1 Revision 2, dated 7 October 2002.\n\nNote 1: Prior accomplishment of the first or initial Requirement 1 inspection in accordance with SB CQB02-1R1 Revision 1 dated 22 April 2002, as specified in the original issue of AD/CESSNA 400/111, is considered acceptable for the first or initial inspection required by this Directive.\n\n    2. If any wire harness P/N 5718106-1 is found chafed or damaged during the Requirement 1 inspections, replace the wire harness with wire harness P/N 5718106-6 in accordance with SB CQB02-1, Revision 2.\n\n    3. If any fuel boost pump lead wires are found chafed or damaged during the Requirement 1 inspections either repair and protect the fuel pump leads or replace the fuel boost pump in accordance with SB CQB02-1, Revision 2.\n\n    4. Install an improved design fuel boost pump (P/N 1C12-17 or an equivalent FAA approved P/N) or protect the fuel boost pump leads in accordance with SB CQB02-1, Revision 2 and install improved design wire harness P/N 5718106-6 in accordance with SB CQB02-1, Revision 2.\n\nNote 2: The FAA defines an improved design fuel boost pump as one that has the pump lead wires protected in accordance with SB CQB02-1, Revision 2.\n\nNote 3: Installing an improved design fuel pump and P/N 5718106-6 wire harness in both wing tanks terminates the Requirement 1 repetitive inspections of this Directive.\n\n    5. Only fuel boost pumps that have been inspected to ensure that the pump leads have been protected in accordance with SB CQB02-1, Revision 2 and improved design wire harnesses P/N 5718106-6 may be installed on any aeroplane as a replacement part.\n\nNote 4: FAA AD 2003-09-09 Amdt 39-13138 and FAA Alternate Method of Compliance Letter (FAA Small Airplane Directorate) dated 13 May 2003 refer.\n\nCompliance: For Requirement 1:\n\n    If not previously accomplished in accordance with AD/CESSNA 400/111 requirement 1 or AD/CESSNA 400/112 Requirement 1 \\- Within the next 25 hours time in service (TIS) after the effective date of this Directive and thereafter at intervals not exceeding 200 hours TIS until Requirement 3 is accomplished.\n\n    b. If previously accomplished in accordance with AD/CESSNA 400/111 Requirement 1 or AD/CESSNA 400/112 Requirement 1 \\- Within the next 200 hours TIS after compliance with AD/CESSNA 400/111 Requirement 1 or AD/CESSNA 400/112 Requirement 1 and thereafter at intervals not exceeding 200 hours TIS until Requirement 3 is accomplished.\n\nFor Requirements 2 and 3 \\- Before further flight after completing the Requirement 1 inspection.\n\nFor Requirement 4 \\- Within the next 400 hours TIS after the effective date of this Directive.\n\nFor Requirement 5 \\- As of the effective date of this Directive. This Amendment becomes effective on 10 September 2003.\n\nBackground The United States Federal Aviation Administration (FAA) has received evidence of chafing and/or arcing of the electrical wiring leading to the fuel boost pump reservoir. Further investigation confirmed reports of chafing and/or arcing of the fuel boost pump wiring inside the fuel pump reservoir that supplies fuel to each engine.\n\nAD/CESSNA 400/111 required a one-time inspection of the fuel boost pump wiring inside and outside the boost pump reservoir, and the repair or replacement of the wiring as necessary. The original issue of this Directive, which superseded AD/CESSNA 400/111, required repetitive inspections until the new design wiring harness are installed and the boost pumps either modified or replaced. These actions were intended to detect and correct chafing and/or arcing of boost pump wiring, which could result in ignition of explosive vapour within the fuel storage system.\n\nThis amendment clarifies what an improved design fuel pump is and requires pumps to be inspected before installation.\n\nThis original issue of this Airworthiness Directive became effective on 10 July 2003.\n\n![](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 3 September 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 10 September 2003.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This amendment clarifies the meaning of an “improved design” fuel pump and adds a requirement that pumps be inspected/protected before installation (Notes 2–4; Requirement 5). It therefore tightens installation rules and specifies the condition that terminates repetitive inspections, modestly expanding operational constraints compared with the prior AD (Requirements; Compliance; Background)."},"complexity_factors":["Narrow applicability: specific model (441) and serial numbers 0001–0362 and 0698 (Applicability).","Multiple interdependent requirements: initial and repetitive inspections, conditional repairs/replacements, retrofit with improved harness and pumps (Requirements 1–4).","Staggered compliance timelines depending on prior compliance with earlier ADs and which actions have already been done (Compliance paragraphs a–b; Notes).","Termination condition: repetitive inspections cease only when improved pump and P/N 5718106-6 harness installed in both wing tanks (Note 3).","Installation prohibition: only pumps inspected/protected and P/N 5718106-6 harnesses may be installed after effective date (Requirement 5).","Cross-references to external documents and authorities: Cessna SB CQB02-1 Rev 2, FAA AD 2003-09-09 and FAA AMOC letter (Requirement text; Notes; Background).","Technical judgement required: inspection for chafing/arcing inside pump reservoirs and assessment whether pump lead wires are adequately protected (Requirement 1; Note 2).","Regulatory basis and enforcement: issued under CASR 1998 subregulation 39.1(1), so delegate discretion and formal AD process apply (preamble)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Cessna 441 aircraft to inspect fuel boost pump wiring for chafing or damage, and to repair or replace wiring or pumps per Cessna Service Bulletin CQB02-1 Rev 2. Inspections repeat until improved-design harnesses and protected pumps are installed. Aircraft owners/operators pay for inspections, repairs and parts; CASA (the delegate) enforces compliance and sets timing. The stated aim is to prevent wiring chafing/arcing that could ignite fuel vapour."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original safety purpose — addressing fuel boost pump wiring hazards in Cessna 441 aircraft. The changes from the original AD are minor clarifications: defining what constitutes an 'improved design fuel pump' and adding a requirement that replacement pumps be inspected before installation. These are refinements to implementation, not an expansion of scope."},"complexity_factors":["Multiple cross-references to previous ADs (AD/CESSNA 400/111 and AD/CESSNA 400/112) and their requirements","Conditional compliance timelines based on whether prior inspections were completed under earlier directives","Five distinct requirements with different compliance triggers and deadlines","References to external technical documents (Cessna Service Bulletin CQB02-1 Revision 2) that contain the actual implementation details","Nested conditions in Requirement 1 compliance (different deadlines depending on prior action under superseded ADs)","Part number specificity (P/N 5718106-1 vs P/N 5718106-6) requiring technical familiarity","Reference to FAA AD and Alternate Method of Compliance Letter (Note 4) creating dual regulatory context"],"plain_english_summary":"This AD requires owners/operators of specified Cessna 441 Conquest aeroplanes to inspect and remediate wiring to the fuel boost pumps because chafing or arcing could ignite fuel vapours. It mandates inspecting, repairing or replacing damaged wiring and installing improved pumps or protected wiring to eliminate the hazard and meet the clarified “improved” standard.\n\nInitial inspection is due within 25 flight hours (or 200 if previously inspected) with full upgrade required within 400 flight hours."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring","history":"/api/acts/ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring/history","analysis":"/api/acts/ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring/analysis","conflicts":"/api/acts/ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring/conflicts","importantCases":"/api/acts/ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring/important-cases","documents":"/api/acts/ad-cessna-400-112-amdt-1-fuel-boost-pump-wiring/documents"}}