{"id":"F2006B11382","name":"AD/MU-2/52 Amdt 1 - Elevator Nose-Down Trim Limit","slug":"ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57283,"registerId":"commonwealth-F2006B11382-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/52 Amdt 1 - Elevator Nose-Down Trim Limit","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nMitsubishi MU-2 Series Aeroplanes\n\nAD/MU-2/52\n\nAmdt 1\n\n  \nElevator Nose-Down Trim Limit 9/93\n\nApplicability: Model MU-2B-10, \\-15, \\-20, \\-25, \\-26, \\-30, \\-35, and \\-36, with serial numbers listed in\n\nMitsubishi SB 216.\n\nModel MU-2B-25, \\-26, \\-26A, \\-35, \\-36, \\-36A, \\-40, and \\-60, with serial numbers listed in Mitsubishi SB 079/27-010.\n\nRequirement: Action in accordance with Mitsubishi Mandatory SB 216 or Mandatory SB 079/27- 010, as applicable.\n\nNote: Japan CAB AD TCD-3740-92 and FAA AD 93-07-11 Amdt 39-8543 refer.\n\nCompliance: For aircraft that were applicable to the original issue of this Directive, compliance remains unchanged:\n\nWithin 100 hours time in service after 1 April 1993 or prior to 1 October 1993, whichever occurs first.\n\nFor aircraft that are now applicable by the issue of Amendment 1 of this Directive: Within 100 hours time in service after 19 August 1993.\n\nBackground: An analysis of the service history on the affected aircraft had revealed one accident and two incidents where the existing elevator nose-down trim deflection had caused excessive control wheel force. This Directive requires certain actions to reduce the maximum deflection of the elevator nose-down trim to a 1-degree to 3-degree range.\n\nAmendment 1 is issued in response to the issue of a FAA AD which requires USA Type Certificated MU-2 aircraft to comply with requirements of this Directive.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive applied to a specific set of MU-2 models. Amendment 1 expanded the scope to include additional models (MU-2B-26A, -36A, -40, and -60) and additional serial numbers covered by Mitsubishi SB 079/27-010. This expansion was triggered by a corresponding FAA Airworthiness Directive that required compliance for US-registered aircraft of these additional types."},"complexity_factors":["Short, single-purpose directive (approximately 250 words)","Only 2 defined applicability groups (original vs. newly affected aircraft)","Simple conditional structure: two compliance deadlines based on prior applicability","Cross-references to 2 external service bulletins and 2 foreign airworthiness directives (Japan CAB and FAA), but these are informational rather than operative","No nested exceptions or complex defined terms","Clear, technical but straightforward mechanical requirement (1-3 degree limit)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Mitsubishi MU-2 aircraft (specific models and serial numbers listed in Mitsubishi service bulletins) to install a physical limit so elevator nose‑down trim deflection is restricted to about 1–3°. It responds to one accident and two incidents where excessive trim led to heavy control forces, and must be complied with within specified 100‑flight‑hour deadlines."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 expanded the Directive's practical scope by adding aircraft made newly applicable in response to the FAA AD and prescribing a 100‑hour compliance window for those newly included aircraft (Compliance; Amendment 1)."},"complexity_factors":["Technical requirement to limit elevator nose‑down trim to a 1°–3° range (Background).","Obligation to follow manufacturer Mandatory Service Bulletin 216 or 079/27‑010 as applicable (Requirement).","Applicability tied to specific MU‑2 models and serial numbers listed in the service bulletins (Applicability).","Different compliance deadlines for aircraft covered by the original Directive versus those newly applicable under Amendment 1 (Compliance).","Cross‑references to foreign ADs (Japan CAB AD TCD‑3740‑92 and FAA AD 93‑07‑11) creating international regulatory alignment (Note/Amendment 1).","Safety‑critical nature increases enforcement and potential operational disruption for operators during modification/inspection (Background/Compliance)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Mitsubishi MU-2 models and serial numbers to carry out the applicable Mitsubishi mandatory Service Bulletin work so the elevator nose‑down trim maximum deflection is limited to 1°–3°. Compliance must be completed within set 100‑hour deadlines (different deadlines apply to aircraft covered by the original Directive and those added by Amendment 1). Operators bear the cost, downtime and inspection/modification work; the change aims to reduce incidents of excessive control‑wheel force."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit","history":"/api/acts/ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit/history","analysis":"/api/acts/ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit/analysis","conflicts":"/api/acts/ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit/conflicts","importantCases":"/api/acts/ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit/important-cases","documents":"/api/acts/ad-mu-2-52-amdt-1-elevator-nose-down-trim-limit/documents"}}