{"id":"F2006B05675","name":"AD/PA-30/33 - Wing Main Spar Lower Cap - Inspection","slug":"ad-pa-30-33-wing-main-spar-lower-cap-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135418,"registerId":"commonwealth-F2006B05675-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-30/33 - Wing Main Spar Lower Cap - Inspection","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)  Piper PA-30 & 39 (Twin Comanche) Series Aeroplanes\n\n \n\nAD/PA-30/33 Wing Main Spar Lower Cap - Inspection 9/83\n\nApplicability: All model PA-30 with S/Nos. 30-2 to 30-2000. All model PA-39 with S/No. 39-1 to 39-155.\n\n \n\nDocument: Piper Service Bulletin No. 751.\n\n \n\nCompliance: Within 100 hours time in service after 30th September 1983.\n\n \n\nBackground: The Manufacturer reports cases of chafing of the wing main spar lower cap where the spar enters the fuselage.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1983 for a specific airframe defect. It has not expanded beyond its original purpose of mandating a one-time inspection for chafing on specific Piper aircraft models."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges for two models)","Single compliance requirement with clear deadline (100 hours time in service after fixed date)","No cross-references to other legislation or regulations beyond citation of parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested provisions","Single technical reference to manufacturer service bulletin","Straightforward cause-and-effect: identified defect → mandatory inspection → clear timeframe"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners to inspect or fix a specific problem.\n\n**What it does:** It orders owners of specific Piper Twin Comanche aeroplanes (models PA-30 and PA-39 with certain serial numbers) to inspect the **wing main spar lower cap** — a critical structural component where the wing attaches to the fuselage. The inspection must happen within 100 hours of flying time after 30 September 1983.\n\n**Why it matters:** The manufacturer (Piper) found cases of **chafing** (wear caused by rubbing) on this part where the wing spar enters the fuselage. This is serious because the main spar carries most of the wing's load; if it fails, the wing could detach. The AD prevents potential catastrophic structural failure by catching wear before it becomes dangerous.\n\n**Who must comply:** Anyone operating these specific Piper aircraft in Australia — the owner or operator is legally responsible for ensuring the inspection is done on time and documented."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The document itself sets a single-scope requirement: inspect the wing main spar lower cap on the listed PA-30 and PA-39 serial numbers as described in Piper Service Bulletin No. 751, within 100 hours after 30 September 1983. The AD text contains no indication that the scope has been changed from an earlier version."},"complexity_factors":["Single, clearly specified mandatory action (inspection) referenced to a single service bulletin (Document).","Narrow applicability limited to specific PA-30 and PA-39 serial number ranges (Applicability).","Short, fixed compliance instruction (within 100 hours time in service after 30 September 1983) which is straightforward to calculate from aircraft logbooks (Compliance).","The AD references an external technical document (Piper Service Bulletin No. 751) for inspection details, creating modest interpretive dependency on that document (Document).","Unspecified follow-up actions and costs if chafing is found introduce some operational uncertainty (Background; Document)."],"plain_english_summary":"The Civil Aviation Safety Authority orders a one‑time inspection of the wing main spar lower cap on specified Piper PA‑30 (s/n 30‑2 to 30‑2000) and PA‑39 (s/n 39‑1 to 39‑155) per Piper Service Bulletin No. 751 within 100 flight hours after 30 September 1983, responding to reported chafing where the spar enters the fuselage. Owners/operators must arrange and pay for the inspection and any follow‑on repairs; costs and further action depend on findings and the service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-30-33-wing-main-spar-lower-cap-inspection","history":"/api/acts/ad-pa-30-33-wing-main-spar-lower-cap-inspection/history","analysis":"/api/acts/ad-pa-30-33-wing-main-spar-lower-cap-inspection/analysis","conflicts":"/api/acts/ad-pa-30-33-wing-main-spar-lower-cap-inspection/conflicts","importantCases":"/api/acts/ad-pa-30-33-wing-main-spar-lower-cap-inspection/important-cases","documents":"/api/acts/ad-pa-30-33-wing-main-spar-lower-cap-inspection/documents"}}