{"id":"F2006B11346","name":"AD/MU-2/18 - Flap Jack Screw - Inspection: Flap Gearbox - Inspection and Re-adjustment","slug":"ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57230,"registerId":"commonwealth-F2006B11346-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/18 - Flap Jack Screw - Inspection: Flap Gearbox - Inspection and Re-adjustment","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)  Mitsubishi MU-2 Series Aeroplanes\n\n \n\nAD/MU-2/18  Flap Jack Screw - Inspection: Flap Gearbox - Inspection and Re-adjustment\n\n\n3/77\n\n \n\nApplicability: Model MU-2B-10, -51, -20, -25 and -26 with S/Nos. 005 to 326. Model MU-2B-30, -\n\n35 and -36 with S/Nos. 501 to 672.\n\n \n\nDocument: Mitsubishi SB No. 167C.\n\n \n\nCompliance: Within 100 hours time in service after 30 April 1977.\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 safety directive focused on a specific mechanical component in specific aircraft models. It has not expanded beyond its original purpose of ensuring flap system safety in the identified Mitsubishi MU-2 variants."},"complexity_factors":["Very short document (approximately 15 lines of substantive content)","Only 2 defined applicability criteria (aircraft models and serial numbers)","Single compliance requirement with clear deadline","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","No conditional logic or nested exceptions","Simple structure: applicability, document reference, compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for specific Mitsubishi MU-2 aircraft models. It mandates a mandatory safety inspection and adjustment of the flap jack screw and flap gearbox components.\n\n**What it does:**\n- Requires owners/operators of certain Mitsubishi MU-2B series aircraft (specific serial numbers) to inspect and re-adjust the flap jack screw and flap gearbox\n- References a specific Mitsubishi Service Bulletin (SB No. 167C) that contains the detailed technical instructions\n\n**Who it affects:**\n- Owners and operators of Mitsubishi MU-2B-10, -51, -20, -25, -26, -30, -35, and -36 aircraft with specific serial number ranges (005-326 for some models, 501-672 for others)\n\n**Why it matters:**\n- Flap systems are critical for aircraft control during takeoff and landing\n- This directive addresses potential mechanical issues that could affect flight safety\n- Compliance is mandatory within 100 hours of flight time after 30 April 1977\n\n**Key terms:**\n- **Airworthiness Directive (AD)**: A legally enforceable order issued by aviation authorities to correct unsafe conditions in aircraft\n- **Time in service**: Actual flight hours accumulated by the aircraft\n- **Service Bulletin**: Technical notice from the manufacturer providing maintenance instructions"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets out a clear, limited scope (specific MU-2 models and serial number ranges) and a defined compliance timeframe. The instrument itself contains no language indicating a change from an earlier or different scope; based on the supplied document, there is no evidence the scope was altered from the instrument’s own stated intent. (Applicability; Compliance; Document.)"},"complexity_factors":["Narrow and explicit applicability by model and serial number (low scope ambiguity). (Applicability)","Single, short compliance window (100 hours after 30 April 1977) — straightforward timing requirement. (Compliance)","Mandatory reliance on an external manufacturer service bulletin for technical detail increases operational dependency but not legal complexity. (Document)","Lack of alternative compliance pathways or explanatory detail in the AD itself increases practical steps operators must take to comply, but does not add legal labyrinthine features. (Document; Compliance)"],"plain_english_summary":"The AD mandates a one‑off inspection and any necessary re‑adjustment of the flap jack screw and flap gearbox on specified Mitsubishi MU‑2B models/serial ranges, to be done per Mitsubishi SB No.167C. Compliance is mandatory within 100 hours' time in service after 30 April 1977. Affected owners/operators must obtain the bulletin, arrange and fund the work, and record completion."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment","history":"/api/acts/ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment/history","analysis":"/api/acts/ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment/analysis","conflicts":"/api/acts/ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment/conflicts","importantCases":"/api/acts/ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment/important-cases","documents":"/api/acts/ad-mu-2-18-flap-jack-screw-inspection-flap-gearbox-inspection-and-re-adjustment/documents"}}