{"id":"F2008L02918","name":"AD/AC-SNOW/8 - Installation of Padding to Cockpit Upper Cross Tube - Modification - CANCELLED","slug":"ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74836,"registerId":"commonwealth-F2008L02918-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Ayres Thrush (Snow) Commander Series Aer","sectionType":"division","heading":"Ayres Thrush (Snow) Commander Series Aeroplanes","content":"### Ayres Thrush (Snow) Commander Series Aeroplanes\n\n| AD/AC-SNOW/8 | Installation of Padding to CockpitUpper Cross Tube - Modification | 9/2008 |\n| ------------ | ----------------------------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                 |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 28 August 2008.                                                                                                                                                                                                                                                    |\n| Background:  | This AD, raised in 1968, required a modification by installation of padding to cockpit cross tubes in accordance with Snow Commander (Aust) Drawing No. SC273. Compliance was required forthwith. As all affected aircraft would have been modified by now, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n18 July 2008","sortOrder":0},{"sectionNumber":"AD/AC-SNOW/8","sectionType":"part","heading":"AD/AC-SNOW/8","content":"## AD/AC-SNOW/8","sortOrder":1},{"sectionNumber":"Installation of Padding to CockpitUpper ","sectionType":"part","heading":"Installation of Padding to CockpitUpper Cross Tube - Modification","content":"## Installation of Padding to Cockpit  \nUpper Cross Tube - Modification","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1739},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the previous airworthiness directive without expanding its scope. It represents completion of the original safety objective (ensuring all affected aircraft were modified) rather than scope creep."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No cross-references to other legislation (only historical reference to technical drawing SC273)","No conditional logic, exceptions, or compliance deadlines"],"plain_english_summary":"**What this document does:** It officially cancels an old aviation safety rule that required protective padding in specific agricultural aircraft.\n\n**Background:** In 1968, the Civil Aviation Safety Authority (CASA) issued a rule requiring owners of **Ayres Thrush (Snow) Commander series aeroplanes** (crop-dusting planes) to install padding on the cockpit's upper cross tube. This was to protect pilots from injury during operations.\n\n**Why it's cancelled:** This rule is 40 years old. CASA determined that every affected aircraft would have been modified by now, so the requirement is no longer necessary.\n\n**What this means:** As of **28 August 2008**, aircraft owners no longer need to follow this specific directive. The padding should already be installed on all relevant planes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled","history":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled/history","analysis":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled/analysis","conflicts":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled/conflicts","importantCases":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled/important-cases","documents":"/api/acts/ad-ac-snow-8-installation-of-padding-to-cockpit-upper-cross-tube-modification-cancelled/documents"}}