{"id":"F2006B05777","name":"AD/PA-31/72 - Landing Gear Actuating Cylinder Rod End Bearing Assembly - Inspection","slug":"ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135644,"registerId":"commonwealth-F2006B05777-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/72 - Landing Gear Actuating Cylinder Rod End Bearing Assembly - 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-31 Series Aeroplanes\n\n \n\nAD/PA-31/72 Landing Gear Actuating Cylinder Rod End\n\nBearing Assembly - Inspection\n\n\n11/78\n\n \n\nApplicability: Models PA-31T with S/Nos. 31T-7400002 to 31T-7820077, PA-31T1 with S/Nos.\n\n31T-7804001 to 31T-7804006.\n\n \n\nDocument: Piper SB No. 570A.\n\n \n\nCompliance: Within 25 hours time in service after 16 October 1978.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific safety issue with defined aircraft. It has not expanded beyond its original purpose of ensuring landing gear integrity for the specified Piper models."},"complexity_factors":["Single, specific mechanical component addressed","Limited applicability — only two specific aircraft models with defined serial number ranges","No defined terms section or complex interpretation provisions","Simple compliance requirement: one inspection within a specified timeframe","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward conditional logic: if you own these specific aircraft, you must do this specific inspection"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a safety inspection for specific Piper PA-31 aircraft.\n\n**What it does:**\n- Requires owners/operators of certain Piper PA-31T and PA-31T1 aeroplanes to inspect the **landing gear actuating cylinder rod end bearing assembly** — a critical component that helps the wheels extend and retract.\n\n**Who it affects:**\n- Owners and operators of Piper PA-31T aircraft with serial numbers 31T-7400002 through 31T-7820077\n- Owners and operators of Piper PA-31T1 aircraft with serial numbers 31T-7804001 through 31T-7804006\n\n**Why it matters:**\n- Landing gear failures can be catastrophic. This directive addresses a specific safety concern identified by the manufacturer (Piper) in Service Bulletin No. 570A.\n- **Compliance deadline:** The inspection must be completed within 25 hours of flight time after 16 October 1978.\n\n**Key point:** This is a mandatory safety order. Non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument's scope, as provided, is a targeted, single-action inspection obligation limited to specified serial numbers of PA-31T and PA-31T1 aeroplanes. There is no indication in the text that the scope has been broadened or narrowed from that stated effect: it requires inspection of the landing gear actuating cylinder rod end bearing assembly per Piper SB No. 570A within the specified 25-hour window. (Applicability; Document; Compliance)"},"complexity_factors":["Narrow, clearly defined applicability by model and serial number (Applicability)","Single, short compliance window (25 hours after 16 October 1978) creates a tight scheduling constraint (Compliance)","Procedural dependency on an external manufacturer service bulletin (Piper SB No. 570A) for inspection steps and remedial actions (Document)","No continuing monitoring or repeated-action obligations in the text—single-event requirement simplifies administration (Compliance)","No enforcement, penalty, or follow-up detail included in the excerpt, reducing statutory complexity but increasing reliance on broader regulatory framework (excerpt lacks enforcement text)"],"plain_english_summary":"Requires a one-time inspection of the landing-gear actuating cylinder rod-end bearing assembly on Piper PA‑31T (s/n 31T‑7400002–31T‑7820077) and PA‑31T1 (s/n 31T‑7804001–31T‑7804006), performed per Piper Service Bulletin No. 570A within 25 hours TIS after 16 October 1978.\n\nOwners/operators must obtain the SB, fund and schedule the inspection and any required repairs, shifting near-term maintenance cost and potential downtime onto the specified fleet."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection","history":"/api/acts/ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection/history","analysis":"/api/acts/ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection/analysis","conflicts":"/api/acts/ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection/important-cases","documents":"/api/acts/ad-pa-31-72-landing-gear-actuating-cylinder-rod-end-bearing-assembly-inspection/documents"}}