{"id":"F2009L00466","name":"AD/PA-36/20 Amdt 2 - Engine Mount Attach Brackets - Inspection and Modification","slug":"ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":77022,"registerId":"commonwealth-F2009L00466-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-36 (Pawnee Brave) Series Aeropl","sectionType":"division","heading":"Piper PA-36 (Pawnee Brave) Series Aeroplanes","content":"### Piper PA-36 (Pawnee Brave) Series Aeroplanes\n\n| AD/PA-36/20 Amdt 2 | Engine Mount Attach Brackets - Inspectionand Modification | 3/2009 |\n| ------------------ | --------------------------------------------------------- | ------ |\n\n| Applicability: | Model PA-36-285 with serial numbers 36-736001 to 36-7660135 except aircraft incorporating Piper Engine Mount Attachment Modification Kit No. 763877 or equivalent.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Inspect welds for cracks on the aft side of the gussets on the fuselage where the engine mount is attached, as shown in Piper SB No. 615. Use dye check or fluorescent penetrant inspection procedures or equivalent.If cracks are found, install Piper Engine Mount Attachment Modification Kit No. 763877 or equivalent prior to further flight. During installation of the Kit, inspect the welds for cracks on the forward side of the gussets on the fuselage where the engine mount is attached, as shown in Piper SB No. 615. Use dye check or fluorescent penetrant inspection procedures or equivalent.Note: USA AD 79-12-09 (amdt 39-3494) refers. |\n| Compliance:    | Inspect at each scheduled inspection for issue of a maintenance release.Compliance with Amendment 1 of this AD constitutes compliance with this Amendment.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n|                | This Amendment becomes effective on 12 March 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | The original issue of this AD in 1978 specified the same applicability and requirements as Piper SB No. 615.Amendment 1 in 1983 extended the applicability to all PA-36 in response to reports of cracked engine mount brackets outside the serial number applicability of Piper SB No. 615.                                                                                                                                                                                                                                                                                                                                                                 |\n\n|     | This Amendment excludes aircraft incorporating Piper Kit No. 763877; restricts serial number applicability to the serial number range specified in USA AD 79-12-09; identifies USA AD 79-12-09; and specifies compliance period in terms of issue of a maintenance release. |\n| --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n8 January 2009","sortOrder":0},{"sectionNumber":"AD/PA-36/20 Amdt 2","sectionType":"part","heading":"AD/PA-36/20 Amdt 2","content":"## AD/PA-36/20 Amdt 2","sortOrder":1},{"sectionNumber":"Engine Mount Attach Brackets - Inspectio","sectionType":"part","heading":"Engine Mount Attach Brackets - Inspectionand Modification","content":"## Engine Mount Attach Brackets - Inspection  \nand Modification","sortOrder":2},{"sectionNumber":"3/2009","sectionType":"part","heading":"3/2009","content":"## 3/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Compared with the AD’s original 1978 applicability, this Amendment narrows scope back to the serial number range specified in USA AD 79‑12‑09 and explicitly excludes aircraft already fitted with Piper Kit No. 763877 (Background). It also formalises compliance timing by tying inspections to issue of a maintenance release (Compliance), so scope and procedural framing differ from Amendment 1 which had previously broadened applicability."},"complexity_factors":["Serial‑number‑limited applicability (Applicability): requires checking records to determine if an aircraft falls into the affected range.","Exclusion for aircraft already incorporating Piper Kit No. 763877 or equivalent (Applicability): requires proof of modification.","Prescribed inspection methods (Requirement): dye‑check or fluorescent penetrant inspection or equivalent increases technical standard required of maintenance providers.","Mandatory corrective action prior to further flight if cracks found (Requirement): immediate grounding until kit installation raises operational and cost consequences for owners.","Additional inspection during kit installation (Requirement): forward‑side gusset welds must also be inspected while installing the kit.","Compliance timing tied to issue of a maintenance release (Compliance): links the mandatory inspection to scheduled maintenance processes rather than a calendar deadline.","Cross‑references to external documents (Requirement/Background): reliance on Piper SB No. 615 and USA AD 79‑12‑09 requires access to and interpretation of those instruments.","Ambiguity introduced by the term 'equivalent' for kits and inspection procedures (Requirement): gives technical discretion to accept substitutes, creating potential for inconsistent application."],"plain_english_summary":"This airworthiness directive requires owners/operators of certain Piper PA‑36‑285 aeroplanes (serials 36‑736001 to 36‑7660135), unless already fitted with Piper Kit No. 763877 or an equivalent, to inspect the engine‑mount gusset welds at each maintenance release and to install the Piper Engine Mount Attachment Modification Kit before further flight if cracks are found. Owners pay for inspections and any kit installation; the Civil Aviation Safety Authority enforces compliance. Inspection methods and a referenced Piper service bulletin and USA AD supply the technical detail."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original 1978 AD applied only to aircraft covered by Piper Service Bulletin No. 615. Amendment 1 in 1983 significantly expanded scope to cover ALL PA-36 aircraft after cracks were found outside the original serial number range. This 2009 Amendment 2 narrows the scope back down, restricting it to the specific serial number range matching the US airworthiness directive and excluding aircraft with the modification kit already installed. The scope has oscillated — first expanded for safety, then refined to match international standards and avoid redundant inspections on already-modified aircraft."},"complexity_factors":["Short, single-purpose document (approximately 300 words)","Only 4 defined elements: specific aircraft model, serial number range, modification kit number, and referenced service bulletin","Simple conditional logic: inspect → if cracks found → install kit","Single cross-reference to USA AD 79-12-09 and Piper SB No. 615","Clear applicability section with explicit exemptions","No nested exceptions or complex temporal provisions"],"plain_english_summary":"Owners/operators of certain Piper PA-36-285 (\"Pawnee Brave\") aircraft must have CASA-mandated inspections of engine-mount gusset welds (using dye-penetrant or fluorescent methods) at each maintenance release. If cracks are found, installation of Piper modification kit No. 763877 is required before flight; aircraft with that kit already fitted are exempt.  \n\nThis AD prevents potential in‑flight engine separation by detecting and repairing cracked mount brackets."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification","history":"/api/acts/ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification/history","analysis":"/api/acts/ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification/analysis","conflicts":"/api/acts/ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification/important-cases","documents":"/api/acts/ad-pa-36-20-amdt-2-engine-mount-attach-brackets-inspection-and-modification/documents"}}