{"id":"F2006B02087","name":"AD/AC/28 - Main Landing Gear Truss - Inspection","slug":"ad-ac-28-main-landing-gear-truss-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41317,"registerId":"commonwealth-F2006B02087-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/28 - Main Landing Gear Truss - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 10/1962,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Main Landing Gear Truss - Inspection,28\ntitle: Airworthiness Directive - AD/AC/28 - Main Landing Gear Truss - Inspection\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/28 Main Landing Gear Truss - Inspection 10/62\n\nApplicability: All models: S/Nos. 231 to 892 except 871 and 875. Document:  Aero Commander SL No. 129.\n\nCompliance: Forthwith.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1669},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original 1962 directive (Issue 10/62) maintaining its original, narrow scope: a one-time safety inspection for landing gear truss integrity on specific affected aircraft. There is no evidence of expansion beyond this original mechanical safety purpose."},"complexity_factors":["Extremely short length (under 150 words)","Single compliance action required (inspection)","Simple applicability criteria (serial number range 231-892 with only two explicit exclusions)","No conditional logic, exceptions to exceptions, or tiered requirements","Technical details incorporated by reference to external manufacturer document (Service Letter No. 129) rather than included in the legislative text"],"plain_english_summary":"**What this requires:** This directive mandates an immediate safety inspection of the main landing gear truss (the structural framework that holds the main wheels) on specific Twin Commander aircraft.\n\n**Who it affects:** Owners and operators of Twin Commander (Gulfstream/Rockwell/Aero Commander 500, 600, and 700 series) aeroplanes with serial numbers 231 to 892, **except** serial numbers 871 and 875.\n\n**What you must do:** You must carry out the inspection procedures described in **Aero Commander Service Letter No. 129** immediately. The term \"forthwith\" means without delay—as soon as practically possible.\n\n**Why it matters:** This is a mandatory safety requirement issued by the Civil Aviation Safety Authority (CASA) to detect potential structural defects in the landing gear before they cause a failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-28-main-landing-gear-truss-inspection","history":"/api/acts/ad-ac-28-main-landing-gear-truss-inspection/history","analysis":"/api/acts/ad-ac-28-main-landing-gear-truss-inspection/analysis","conflicts":"/api/acts/ad-ac-28-main-landing-gear-truss-inspection/conflicts","importantCases":"/api/acts/ad-ac-28-main-landing-gear-truss-inspection/important-cases","documents":"/api/acts/ad-ac-28-main-landing-gear-truss-inspection/documents"}}