{"id":"F2006B11405","name":"AD/MUSTANG/2 Amdt 1 - Main Landing Gear Pivot Shaft - Inspection","slug":"ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57306,"registerId":"commonwealth-F2006B11405-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MUSTANG/2 Amdt 1 - Main Landing Gear Pivot Shaft - 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)  C.A.C. CA-18 (Mustang) Series Aeroplanes\n\n \n\nAD/MUSTANG/2\n\nAmdt 1\n\n\nMain Landing Gear Pivot Shaft - Inspection 1/84\n\n \n\nApplicability: All models engaged in aerial work or charter operations.\n\n \n\nRequirement: Inspect the main landing gear pivot shaft P/N 17-33163 or 66584 for cracking using an approved magnetic particle method.\n\n \n\nCompliance: At intervals not exceeding 250 landings, and within 10 landings following any heavy landing or other shock loading.\n\n \n\nBackground: This Directive has been revised to delete aircraft not involved in aerial work or charter operations, and to clarify the part numbers of affected components.\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":true,"description":"The Background section explicitly states this amendment narrowed the scope by deleting aircraft 'not involved in aerial work or charter operations.' The original directive likely applied to all CAC CA-18 Mustangs regardless of use; Amendment 1 restricts it to commercially operated aircraft only, exempting private owners."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined part numbers (P/N 17-33163 and 66584)","Single technical requirement with clear compliance intervals","No cross-references to other legislation or regulations","Simple binary applicability test (aerial work/charter vs private)","No nested conditions or exceptions beyond the applicability clause"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all **CAC CA-18 Mustang aircraft** (World War II-era fighter planes) that are used for **aerial work or charter flights** (such as joy flights, filming, or paid passenger services).\n\n**What it requires:**\n- **Inspection of the main landing gear pivot shaft** — a critical structural component that connects the wheel assembly to the aircraft body.\n- **How:** Using **magnetic particle inspection** (a specialised technique that detects cracks in metal by applying magnetic fields and iron particles).\n- **When:**\n  - **Every 250 landings** (regular interval), **and**\n  - **Within 10 landings** after any **heavy landing** or shock loading (hard impact that could damage the shaft).\n\n**Why it matters:**\nThe pivot shaft is under enormous stress during takeoff and landing. Cracks in this part could cause **landing gear collapse** — potentially catastrophic during landing or taxiing. This directive was updated to focus only on commercially operated Mustangs (not private owners) and to specify exactly which part numbers need checking."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment narrowed the scope by limiting applicability to aircraft engaged in aerial work or charter operations and removed other aircraft from the requirement (Background; Applicability). The amendment also clarified the affected component by specifying part numbers 17-33163 or 66584 (Requirement; Background)."},"complexity_factors":["Narrow applicability limited to operators engaged in aerial work or charter operations (Applicability).","Identification of specific affected components by part number (P/N 17-33163 or 66584) requires precise parts control (Requirement).","Mandated inspection method must be an \"approved magnetic particle method\", introducing regulator approval/discretion (Requirement).","Two-trigger compliance timing: periodic interval (≤250 landings) and event-driven inspection (within 10 landings after heavy landing/shock) (Compliance).","Operational recordkeeping and scheduling to track landing counts and heavy landing events (Compliance).","Potential need to rely on authorised/approved maintenance providers if local providers lack approval (Requirement)."],"plain_english_summary":"This directive requires operators of C.A.C. CA-18 (Mustang) aeroplanes used in aerial work or charter to have the main landing‑gear pivot shaft (specified part numbers) inspected for cracking using an approved magnetic‑particle method.  \n\nIt matters because it forces recurring inspections and related costs/downtime on affected operators, channels technical approval to the regulator or authorised examiners, and aims to detect cracks that could lead to landing‑gear failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection","history":"/api/acts/ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection/history","analysis":"/api/acts/ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection/analysis","conflicts":"/api/acts/ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection/conflicts","importantCases":"/api/acts/ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection/important-cases","documents":"/api/acts/ad-mustang-2-amdt-1-main-landing-gear-pivot-shaft-inspection/documents"}}