{"id":"F2006B11399","name":"AD/MU-2/69 - Flap Drive Torque Tube","slug":"ad-mu-2-69-flap-drive-torque-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57300,"registerId":"commonwealth-F2006B11399-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nMitsubishi MU-2 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/MU-2/69 Flap Drive Torque Tube 2/2002","sectionType":"part","heading":"AD/MU-2/69 Flap Drive Torque Tube 2/2002 DM","content":"# AD/MU-2/69 Flap Drive Torque Tube 2/2002 DM\n\nApplicability: Model MU-2B; MU-2B-10, \\-15, \\-20, \\-25, \\-26, \\-30, \\-35, and \\-36 aircraft, with serial\n\nnumbers 008 through 347, and 501 through 696; excluding aircraft with serial\n\nnumbers 313, 321, 652, and 661.\n\nRequirement: Inspect in accordance with Mitsubishi Service Bulletin No. 237, dated 13 December 2001.\n\nNote: JCAB AD TCD-5864-2001 refers.\n\nCompliance: Before further flight after 16 January 2002, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 16 January 2002.\n\nBackground: The JCAB requires inspection to detect improper installation of flap drive torque tubes which could result in disconnection of the flap drive train, and consequent asymmetrical flap deployment and loss of control of the aircraft.\n\n![Signature of Steven John Swift Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nSteven John Swift\n\nDelegate of the Civil Aviation Safety Authority 9 January 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 16 January 2002.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific safety-critical mechanical defect identified by the Japanese aviation authority and mandates a targeted inspection. There is no evidence of scope creep; the directive remains focused on the single unsafe condition regarding flap drive torque tube installation in the specified aircraft models."},"complexity_factors":["Single, specific mechanical issue addressed (flap drive torque tube installation)","Clear applicability section with explicit serial number ranges and exclusions","Single requirement referencing an external technical document (Mitsubishi Service Bulletin No. 237)","Simple compliance deadline (before further flight after fixed date)","No nested exceptions, conditional logic, or extensive defined terms","Short document (approximately 250 words) with straightforward structure"],"plain_english_summary":"The Civil Aviation Safety Authority has ordered a mandatory inspection of the flap drive torque tube on certain Mitsubishi MU-2B aircraft (serials 008–347 and 501–696, excluding 313, 321, 652, 661) after discovery of a fault that can allow the flaps to become disconnected and deploy asymmetrically, risking loss of control. Owners/operators must inspect and correct the torque tube per Mitsubishi Service Bulletin No. 237 before the aircraft next flies after 16 January 2002 unless already inspected."},"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD implements an inspection requirement corresponding to the JCAB AD and Mitsubishi Service Bulletin No. 237 for the named MU‑2B models/serials. It does not expand applicability beyond those referenced items; it prescribes an inspection and any corrective action per the service bulletin and is limited to the listed aircraft (Applicability, Requirement, Background)."},"complexity_factors":["Narrow applicability to specific MU‑2B models and a defined serial-number range, with four serials explicitly excluded (Applicability).","Immediate compliance requirement: inspection 'before further flight' after the effective date creates potential short-term grounding and scheduling burden on operators (Compliance).","Reliance on an external document (Mitsubishi Service Bulletin No. 237 dated 13 December 2001) for the technical inspection procedure — operators must obtain and follow that SB (Requirement).","Cross-reference to a foreign authority AD (JCAB AD TCD‑5864‑2001) may require coordination or interpretation against local records (Note / Background).","Low regulatory discretion in language — the AD prescribes inspection without an alternatives pathway, but the technical remedy and any corrective action follow the service bulletin (Requirement), reducing interpretive uncertainty for regulators."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Mitsubishi MU‑2B series aeroplanes (listed models and serial numbers) to inspect the flap drive torque tube following Mitsubishi Service Bulletin No. 237 to detect improper installation that could disconnect the flap drive train. CASA (the delegate signing the AD) mandates the inspection before further flight from 16 January 2002; operators fund and carry out the inspection and any corrective work, using the service bulletin and the referenced JCAB AD as the inspection instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-69-flap-drive-torque-tube","history":"/api/acts/ad-mu-2-69-flap-drive-torque-tube/history","analysis":"/api/acts/ad-mu-2-69-flap-drive-torque-tube/analysis","conflicts":"/api/acts/ad-mu-2-69-flap-drive-torque-tube/conflicts","importantCases":"/api/acts/ad-mu-2-69-flap-drive-torque-tube/important-cases","documents":"/api/acts/ad-mu-2-69-flap-drive-torque-tube/documents"}}