{"id":"F2006B11279","name":"AD/ML-M4/10 - Fuel Return Lines - Inspection and Modification","slug":"ad-ml-m4-10-fuel-return-lines-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57086,"registerId":"commonwealth-F2006B11279-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ML-M4/10 - Fuel Return Lines - Inspection and 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)  Maule M-4 Series Aeroplanes\n\n \n\nAD/ML-M4/10 Fuel Return Lines - Inspection and Modification\n\n\n11/75\n\n \n\nApplicability: Model M-4-210 with S/Nos. 1001 to 1045. Model M-4-210C with S/Nos. 1001C to 1117C.\n\n \n\nRequirement: 1. Inspect line P/No. 5182X-21 for leakage and cracking in accordance with Maule SL No. 31.\n\n \n\n2. Replace line P/No. 5182X-20 in accordance with Maule SL No. 31 or in accordance with a scheme approved by the Secretary; or\n\n \n\n3. FAA AD 75-11-02.\n\n \n\nCompliance: Within 100 hours time in service after 28 November 1975.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to the specified Maule M-4-210 and M-4-210C serial numbers and mandates inspection and/or replacement of identified fuel return lines within a defined compliance window. The text does not expand or contract that stated applicability or requirements beyond what is set out in the AD (Applicability; Requirement 1; Requirement 2; Compliance)."},"complexity_factors":["Targeted applicability limited to specific models and serial numbers adds precision but requires owners to check serial numbers.","Multiple part numbers referenced (P/No. 5182X-21 for inspection; P/No. 5182X-20 for replacement) requiring correct parts identification.","Cross-reference to an external technical document (Maule Service Letter No. 31) for the required procedures.","Alternative compliance routes (Secretary-approved scheme or FAA AD 75-11-02) introduce decision points and administrative interaction.","Fixed compliance deadline measured in hours-in-service after a calendar date, requiring tracking of aircraft flight hours."],"plain_english_summary":"Owners/operators of specific Maule M‑4‑210 and M‑4‑210C aeroplanes must inspect fuel return line P/N 5182X‑21 for leakage/cracking and, where required, replace P/N 5182X‑20 per Maule Service Letter No. 31 within 100 hours’ time-in-service of 28 Nov 1975. Costs and downtime fall to owners; compliance may alternatively follow a Secretary‑approved replacement scheme or FAA AD 75‑11‑02."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of addressing fuel line integrity in early-model Maule M-4 aircraft."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined aircraft models with specific serial number ranges","Simple three-option compliance structure (inspect, replace using one of three methods)","Single, clear deadline (100 hours time in service after a fixed date)","No nested exceptions or conditional logic","Only one cross-reference (to FAA AD 75-11-02) and one internal reference (Maule SL No. 31)","No interpretation section or defined terms"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific **Maule M-4 series aeroplanes**.\n\n**What it does:**\n- Requires owners/operators of certain Maule aircraft to inspect and potentially replace fuel return lines due to safety concerns about leaks and cracks.\n\n**Who it affects:**\n- Owners of **Model M-4-210** aircraft with serial numbers 1001 to 1045\n- Owners of **Model M-4-210C** aircraft with serial numbers 1001C to 1117C\n\n**What must be done:**\n1. **Inspect** fuel line part number 5182X-21 for leaks and cracks, following Maule Service Letter No. 31\n2. **Replace** fuel line part number 5182X-20, either:\n   - Using Maule Service Letter No. 31, OR\n   - Using an alternative scheme approved by the Secretary (a government aviation official), OR\n   - Following the equivalent US Federal Aviation Administration directive (FAA AD 75-11-02)\n\n**When:**\n- Within **100 hours of flight time** after 28 November 1975\n\n**Why it matters:**\nFuel leaks in aircraft are serious safety hazards that can cause engine failure or fire. This directive ensures potentially defective fuel lines are identified and fixed before they cause accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ml-m4-10-fuel-return-lines-inspection-and-modification","history":"/api/acts/ad-ml-m4-10-fuel-return-lines-inspection-and-modification/history","analysis":"/api/acts/ad-ml-m4-10-fuel-return-lines-inspection-and-modification/analysis","conflicts":"/api/acts/ad-ml-m4-10-fuel-return-lines-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-ml-m4-10-fuel-return-lines-inspection-and-modification/important-cases","documents":"/api/acts/ad-ml-m4-10-fuel-return-lines-inspection-and-modification/documents"}}