{"id":"F2006B08380","name":"AD/CESSNA 400/96 - Auxiliary Fuel Pump Wiring Modification","slug":"ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115807,"registerId":"commonwealth-F2006B08380-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/96 - Auxiliary Fuel Pump Wiring Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 400 Series Aeroplanes\n\nAD/CESSNA 400/96 Auxiliary Fuel Pump Wiring Modification 12/89\n\nApplicability: All models 401, 402, 404, 411, 414, and 421 which have been modified in accordance with Cessna Service Bulletin MEB 88-3.\n\nRequirement: Unless already accomplished, action in accordance with Cessna Service Bulletin MEB 88-3 Revision 1.\n\nNote: This Requirement does not apply to aeroplanes that have not incorporated SB MEB 88-3.\n\nCompliance: Prior to the issue of the next maintenance release after 31 December 1989.\n\nBackground: Compliance with the original issue of SB MEB 88-3 was not considered to warrant the issue of an Airworthiness Directive. This AD is raised to ensure that necessary features of revision 1 are incorporated into modified aeroplanes.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Before this AD, the regulator considered compliance with the original issue of SB MEB 88-3 insufficient to require an AD (Background). This instrument changes scope by legally requiring that aircraft which had previously incorporated the original SB must now incorporate the additional features of Revision 1 (Requirement). Aircraft that never incorporated the original SB remain outside the AD’s scope (Note)."},"complexity_factors":["Narrow applicability limited to aircraft previously modified under Cessna SB MEB 88-3 (Applicability; Note)","Mandatory reference to an external technical document (Cessna Service Bulletin MEB 88-3 Revision 1) rather than setting technical detail in the AD itself (Requirement)","A fixed compliance timing tied to the operator’s next maintenance release after a calendar date (Compliance)","Regulatory form is an Airworthiness Directive under Part 39, so it creates a legal obligation to comply (Header)","Technical work (wiring modification) requires qualified maintenance resources and downtime, which are implementation-level complexities (Requirement)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Cessna 401/402/404/411/414/421 aeroplanes that were previously modified under the original Cessna Service Bulletin MEB 88-3 to incorporate the auxiliary fuel pump wiring changes specified in Revision 1 of SB MEB 88-3. Work must be completed before the next maintenance release after 31 December 1989. CASA issues the AD; owners/operators pay for parts, labour and downtime to achieve compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive with a narrow, well-defined scope. It addresses one specific wiring modification for a limited fleet of aircraft and does not represent scope creep from any original intent."},"complexity_factors":["Single, specific requirement referencing an external technical document (Cessna Service Bulletin)","Narrow applicability limited to 6 specific aircraft models with a prior modification","Simple conditional logic: applies only if SB MEB 88-3 was previously incorporated","No defined terms section, no cross-references to other legislation beyond the enabling regulations","Clear, fixed compliance deadline","Total length: approximately 150 words"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nIt requires owners and operators of specific Cessna twin-engine aircraft (models 401, 402, 404, 411, 414, and 421) to modify the wiring for their auxiliary fuel pumps. The modification must follow Cessna Service Bulletin MEB 88-3, Revision 1.\n\n**Who it affects:**\n- Only applies to aircraft that were **already modified** under the original Cessna Service Bulletin MEB 88-3\n- Does **not** apply to aircraft that never had that original modification done\n\n**Why it matters:**\nThe original service bulletin didn't trigger a mandatory directive because CASA didn't think it was critical enough. However, after reviewing Revision 1 of that bulletin, CASA decided the updated wiring changes were important enough for flight safety to make them legally compulsory. If you don't comply, you can't get your next maintenance release (the official paperwork that says your plane is safe to fly) after 31 December 1989.\n\n**The bottom line:** If you own one of these Cessna twins and had the original fuel pump wiring mod done, you must update it to the revised standard before your next scheduled maintenance check after the end of 1989."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification","history":"/api/acts/ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification/history","analysis":"/api/acts/ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification/analysis","conflicts":"/api/acts/ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification/conflicts","importantCases":"/api/acts/ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification/important-cases","documents":"/api/acts/ad-cessna-400-96-auxiliary-fuel-pump-wiring-modification/documents"}}