{"id":"F2006B08271","name":"AD/CESSNA 340/26 Amdt 2 - Crossfeed Fuel Line","slug":"ad-cessna-340-26-amdt-2-crossfeed-fuel-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115581,"registerId":"commonwealth-F2006B08271-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 340/26 Amdt 2 - Crossfeed Fuel Line","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 340 Series Aeroplanes\n\nAD/CESSNA 340/26\n\nAmdt 2\n\n  \nCrossfeed Fuel Line 1/91\n\nApplicability: Models 340 and 340A with Serial Nos 340-0001 through 340A 1817. Requirement: Action in accordance with Cessna Service Bulletin No MEB 87-7 Revision 1.\n\nNote 1: Aircraft certified as being modified in accordance with Rex Aviation Tech. Memo No TM-26/A meet the requirement of this Directive. Cancelled AD/CESSNA 340/22 refers.\n\nNote 2: FAA AD 88-03-07 Amdt 39-5841 refers.\n\nCompliance: Effective 24 January 1991 \\- prior to the issue of the next Maintenance Release. Background: This Directive has been amended to reflect the cancellation of CAO 105\n\nAD/CESSNA 340/22. This directive was issued following advice that the FAA had\n\nreceived reports of fuel leaks caused by chafing of the crossfeed fuel lines. The requirements of this AD will ensure proper clearance between the crossfeed fuel lines and firewall stiffener and eliminate the potential fire hazard due to fuel leakage. This requirement duplicated the requirement of AD/CESSNA 340/22, therefore AD/CESSNA 340/22 has been cancelled.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment only records the cancellation of AD/CESSNA 340/22 and retains the same requirement to fix crossfeed-line clearance; the directive duplicated the prior AD and the substantive scope, applicability, and compliance timing were not changed (\"This Directive has been amended to reflect the cancellation of CAO 105 AD/CESSNA 340/22\"; \"This requirement duplicated the requirement of AD/CESSNA 340/22\")."},"complexity_factors":["Narrow applicability by serial number range (Applicability).","Mandates action by reference to an external manufacturer service bulletin rather than spelling technical steps in the directive itself (Requirement: Cessna Service Bulletin No MEB 87-7 Revision 1).","Offers an alternative compliance proof: aircraft modified per Rex Aviation Tech. Memo TM-26/A meet the requirement (Note 1), requiring record checks.","Tight compliance timing tied to operational maintenance cycles: \"prior to the issue of the next Maintenance Release\" (Compliance), which can compress scheduling for operators.","Administrative cross-references: cancellation of a prior AD and reference to FAA AD (Background and Note 2) require regulators/operators to reconcile multiple documents.","Implementation burden (borne by owners/operators): physical inspection/modification, parts/labour, and maintenance records updates (implied by Requirement and Compliance).","Low regulatory discretion: directive prescribes compliance path by bulletin; limited room for alternative solutions except as noted (Requirement and Note 1).","Safety justification and risk source are specific and technical — fuel-line chafing and leaks — which focuses remedial work but requires technical competence to assess and fix (Background)."],"plain_english_summary":"Requires owners/operators of Cessna 340 and 340A (serial nos 340-0001 to 340A1817) to inspect/modify the crossfeed fuel line per Cessna Service Bulletin MEB 87-7 Rev 1 so the line clears the firewall stiffener and cannot chafe. Compliance must occur before the next Maintenance Release. The directive aims to remove a fuel-leak/fire hazard and duplicates an earlier AD now cancelled."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment (Amdt 2) is purely administrative — it updates the directive to reflect the cancellation of a duplicate directive (AD/CESSNA 340/22). The substantive safety requirement (fixing the fuel line chafing issue) remains unchanged from the original 1991 directive. The scope has not expanded beyond the original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined applicability criteria (model numbers and serial number range)","Single technical requirement referencing an external standard (Cessna Service Bulletin)","Minimal conditional logic — essentially 'if you own this plane, do this fix'","Two straightforward notes providing alternative compliance paths and cross-references","No nested exceptions or complex procedural steps within the directive itself"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and corrective action on crossfeed fuel lines of certain Cessna 340/340A aeroplanes (specified serial range) to stop chafing against a firewall stiffener that can cause fuel leaks and fires. Owners, operators and maintenance organisations must follow Cessna Service Bulletin MEB 87‑7 Rev 1; aircraft modified per Rex Aviation TM‑26/A are already compliant. It replaces the earlier AD/CESSNA 340/22."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-340-26-amdt-2-crossfeed-fuel-line","history":"/api/acts/ad-cessna-340-26-amdt-2-crossfeed-fuel-line/history","analysis":"/api/acts/ad-cessna-340-26-amdt-2-crossfeed-fuel-line/analysis","conflicts":"/api/acts/ad-cessna-340-26-amdt-2-crossfeed-fuel-line/conflicts","importantCases":"/api/acts/ad-cessna-340-26-amdt-2-crossfeed-fuel-line/important-cases","documents":"/api/acts/ad-cessna-340-26-amdt-2-crossfeed-fuel-line/documents"}}