{"id":"F2006B08242","name":"AD/CESSNA 337/23 - Battery Lid Retaining Channel - Modification","slug":"ad-cessna-337-23-battery-lid-retaining-channel-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115509,"registerId":"commonwealth-F2006B08242-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 337/23 - Battery Lid Retaining Channel - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Cessna 337 Series Aeroplanes\n\n \n\nAD/CESSNA 337/23 Battery Lid Retaining Channel - Modification 8/77\n\nApplicability: Model 337 with S/Nos. prior to 33701463.\n\n \n\nRequirement: 1. Inspect the landing gear hydraulic lines in the vicinity of the battery for damage caused by electric arcing between the battery lid retaining channel and the positive terminal of the battery. Replace any line showing arcing damage.\n\n \n\n2. Insulate the battery lid retaining channel with nylex sheathing or similar material and install protective rubber terminal ends (P/N MS25171-35 or similar) to the battery lead ends.\n\n \n\nNote: Rex Aviation Technical Memo TM-43 also refers to this problem.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 1977.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1643},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is the original 1977 Airworthiness Directive. The word 'Modification' in the title refers to the physical modification required to be made to the aircraft (adding insulation), not a modification to the directive itself. The scope remains tightly limited to the specific safety defect identified in early Cessna 337 aircraft."},"complexity_factors":["Single-page directive with no interpretation section or defined terms","Simple applicability test based solely on aircraft serial number","Two clear, sequential requirements without nested conditions or exceptions","No cross-references to other legislative provisions or regulations"],"plain_english_summary":"This is a **safety rule** for owners of specific Cessna 337 aircraft (twin-engine planes with front and rear propellers). It applies only to planes with serial numbers before 33701463.\n\nThe rule fixes a dangerous design flaw: the metal channel holding the battery lid could touch the battery's positive terminal, causing **electric sparks (arcing)**. These sparks can burn holes in the nearby landing gear hydraulic lines, which could lead to hydraulic system failure.\n\n**What aircraft owners must do:**\n1. **Inspect** the hydraulic lines near the battery for burn marks or damage caused by electric sparks. Replace any damaged lines.\n2. **Protect** the battery lid channel by wrapping it with electrical insulation (such as nylex sheathing).\n3. **Cover** the battery cable ends with protective rubber caps (part number MS25171-35 or similar).\n\nOwners had to complete these steps within 100 flight hours after 30 September 1977."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-337-23-battery-lid-retaining-channel-modification","history":"/api/acts/ad-cessna-337-23-battery-lid-retaining-channel-modification/history","analysis":"/api/acts/ad-cessna-337-23-battery-lid-retaining-channel-modification/analysis","conflicts":"/api/acts/ad-cessna-337-23-battery-lid-retaining-channel-modification/conflicts","importantCases":"/api/acts/ad-cessna-337-23-battery-lid-retaining-channel-modification/important-cases","documents":"/api/acts/ad-cessna-337-23-battery-lid-retaining-channel-modification/documents"}}