{"id":"F2006B05947","name":"AD/PA-36/9 - Control System Torque Tube Front Bearing Plate Attachment Bolt - Inspection","slug":"ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136093,"registerId":"commonwealth-F2006B05947-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-36/9 - Control System Torque Tube Front Bearing Plate Attachment Bolt - 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-36 (Pawnee Brave) Series Aeroplanes\n\n \n\n# AD/PA-36/9 Control System Torque Tube Front Bearing Plate\n\nAttachment Bolt - Inspection\n\nApplicability: All models PA-36-285 with S/Nos. 36-7560001 to 36-7560121.\n\n# 12/75\n\n \n\nRequirement: To determine proper installation of the front bearing plate bolt on the control system torque tube accomplish the following:\n\n \n\n1. Remove fuselage belly panel directly beneath the pilot seat.\n\n\n \n\n2.    Refer to figure 5-1, sketch A of PA-36 Service Manual and locate front bearing plate to torque tube attachment bolt.\n\n \n\n3.    Ensure bolt (item 14) is tight and exhibits proper thread engagement in barrel nut (visible through aperture in torque tube): a minimum of 1 1/2 threads should be visible.\n\n \n\n4.    If proper thread engagement is not found, remove forward bolt (item 14) and install proper length bolt (AN4-13A or equivalent).\n\n \n\n5.    Recheck controls for proper operation; or FAA AD 75-20-07 Amendment 39-2373.\n\nCompliance: Within 10 hours time in service after 31 October 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused on one specific mechanical defect in one aircraft model. It has not expanded beyond its original purpose of addressing the control system bolt installation issue."},"complexity_factors":["Single, discrete maintenance task with 5 sequential steps","Only one defined applicability criterion (specific serial number range)","No cross-references to other legislation beyond optional alternative compliance with FAA AD 75-20-07","No conditional logic or exceptions — straightforward pass/fail inspection with prescribed remedy","Technical but not legally complex: uses aviation terminology (torque tube, barrel nut, AN4-13A) but in a procedural context","Extremely short document (approximately 200 words of substantive content)"],"plain_english_summary":"Orders owners/operators of certain Piper PA-36 \"Pawnee Brave\" aircraft (S/N 36-7560001 to 36-7560121) to inspect the front bearing plate bolt on the flight control torque tube for correct installation and thread engagement, replacing it if inadequate and verifying control operation.\n\nA loose or insufficiently engaged bolt could fail and lead to loss of control; the AD targets this defect to prevent potentially catastrophic flight-control failures."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to the named PA-36-285 serial numbers and prescribes inspection and replacement actions; the text shows no expansion or narrowing beyond that applicability and the listed procedural steps."},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability line)","Physical access required: remove fuselage belly panel to inspect (Requirement 1)","Reference to PA-36 Service Manual figure for locating the part (Requirement 2)","Quantitative acceptance criterion: minimum 1 1/2 threads visible — measurement/inspection judgement (Requirement 3)","Mandated replacement with a specific bolt AN4-13A or 'equivalent' introduces equivalence judgment (Requirement 4)","Operational verification: recheck controls or follow FAA AD 75-20-07 (Requirement 5)","Short compliance window (10 hours TIS after 31 Oct 1975) creates scheduling pressure (Compliance)","Mechanical skill and potential shop time required for removal, replacement and control checks (Requirements 1, 4, 5)"],"plain_english_summary":"This airworthiness directive requires owners/operators of Piper PA-36-285 aircraft (S/N 36-7560001 to 36-7560121) to inspect the torque-tube front bearing-plate attachment bolt, ensure at least 1½ threads are visible in the barrel nut and the bolt is tight, and replace it with AN4-13A (or equivalent) if not. Compliance is within 10 hours time-in-service after 31 October 1975.\n\nIt affects only the listed serial-numbered aircraft; operators must remove the fuselage belly panel to inspect and bear the cost of any replacement parts and labour."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection","history":"/api/acts/ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection/history","analysis":"/api/acts/ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection/analysis","conflicts":"/api/acts/ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection/conflicts","importantCases":"/api/acts/ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection/important-cases","documents":"/api/acts/ad-pa-36-9-control-system-torque-tube-front-bearing-plate-attachment-bolt-inspection/documents"}}