{"id":"F2006B02220","name":"AD/AC-SNOW/8 - Installation of Padding to Cockpit Upper Cross Tube - Modification","slug":"ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41450,"registerId":"commonwealth-F2006B02220-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-SNOW/8 - Installation of Padding to Cockpit Upper Cross Tube - Modification","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 5/1968,Aircraft below 5700 kg,Ayres Thrush (Snow) Commander Series Aeroplanes,Installation of Padding to Cockpit Upper Cross Tube - Modification,8\ntitle: Airworthiness Directive - AD/AC-SNOW/8 - Installation of Padding to Cockpit Upper Cross Tube - Modification\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)  Ayres Thrush (Snow) Commander Series Aeroplanes\n\n \n\nAD/AC-SNOW/8 Installation of Padding to Cockpit\n\nUpper Cross Tube - Modification\n\n\n5/68\n\n \n\nApplicability: Model S-2D.\n\n \n\nDocument: Snow Commander (Aust) Dwg. No. SC273. Compliance: 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1666},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive remains tightly scoped to its original purpose: a specific structural modification (padding installation) for a single aircraft model (S-2D). There is no evidence of expansion into broader operational requirements or additional aircraft types."},"complexity_factors":["Single unconditional requirement with no exceptions","No defined terms section or interpretive provisions","Zero cross-references to other legislative instruments","Binary compliance status (compliant/non-compliant)","Document length is approximately 50 words of operative text"],"plain_english_summary":"**What this does:** This is a mandatory safety order (called an Airworthiness Directive) that requires a simple physical modification to specific agricultural aircraft.\n\n**Who it affects:** Owners and operators of the **Ayres Thrush (Snow) Commander S-2D** — a single-engine agricultural aeroplane (crop duster).\n\n**What must be done:** You must install padding on the cockpit's upper cross tube (a structural metal bar in the ceiling/roof area of the pilot's compartment). The work must follow technical drawing **SC273** from Snow Commander (Australia).\n\n**When:** **Immediately** (the term \"Forthwith\" means without delay — you cannot fly the aircraft until this is done).\n\n**Why it matters:** This prevents head injuries. Without padding, pilots risk striking their heads on the metal cross tube during turbulence or in an accident. This is a **compulsory** safety fix — non-compliance grounds the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification","history":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification/history","analysis":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification/analysis","conflicts":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification/conflicts","importantCases":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification/important-cases","documents":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification/documents"}}