{"id":"F2009L03927","name":"AD/BELL 412/20 - Bolts P/N AN4-5A - Pylon Support - CANCELLED","slug":"ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81316,"registerId":"commonwealth-F2009L03927-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 412 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 412 Series Helicopters","content":"### Bell Helicopter Textron 412 Series Helicopters\n\n| AD/BELL 412/20 | Bolts P/N AN4-5A - Pylon Support | 12/2009 |\n| -------------- | -------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                              |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 19 November 2009.                                                                                                                                               |\n| Background:  | This unique Australian AD specified a once-only inspection in accordance with Alert SB 412-88-38 at the next inspection for MR issue after November 1988. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 September 2009","sortOrder":0},{"sectionNumber":"AD/BELL 412/20","sectionType":"part","heading":"AD/BELL 412/20","content":"## AD/BELL 412/20","sortOrder":1},{"sectionNumber":"Bolts P/N AN4-5A - Pylon Support","sectionType":"part","heading":"Bolts P/N AN4-5A - Pylon Support","content":"## Bolts P/N AN4-5A - Pylon Support","sortOrder":2},{"sectionNumber":"12/2009","sectionType":"part","heading":"12/2009","content":"## 12/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2105},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument is a straightforward cancellation notice that achieves its sole intended purpose of revoking the previous airworthiness directive. The scope remains limited to the administrative removal of the inspection requirement."},"complexity_factors":["Single administrative action (cancellation)","No operative provisions or conditional logic","No defined terms or cross-references to interpret","Extremely short document with only one substantive requirement"],"plain_english_summary":"This document officially **cancels a previous aircraft safety rule** affecting Bell 412 helicopters.\n\n**What it does:**\n- Revokes Airworthiness Directive (AD) requirements regarding specific bolts (part number AN4-5A) on the pylon support structure\n- Removes the need for a once-only inspection that was previously required under Alert SB 412-88-38\n\n**Who it affects:**\n- Owners and operators of Bell Helicopter Textron 412 series helicopters\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nAs of **19 November 2009**, operators no longer need to perform this specific bolt inspection, reducing maintenance requirements for these aircraft. The Civil Aviation Safety Authority (CASA) has determined the inspection is no longer necessary for airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled","history":"/api/acts/ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled/history","analysis":"/api/acts/ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled/analysis","conflicts":"/api/acts/ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled/conflicts","importantCases":"/api/acts/ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled/important-cases","documents":"/api/acts/ad-bell-412-20-bolts-p-n-an4-5a-pylon-support-cancelled/documents"}}