{"id":"F2005L02084","name":"AD/B727/111 Amdt 1 - Engine Mount Cone Bolt Nuts","slug":"ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36297,"registerId":"commonwealth-F2005L02084-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 727 Series Aeroplanes","sectionType":"division","heading":"Boeing 727 Series Aeroplanes","content":"### Boeing 727 Series Aeroplanes\n\n| AD/B727/111 Amdt 1 | Engine Mount Cone Bolt Nuts | 9/2005 |\n| ------------------ | --------------------------- | ------ |\n\n| Applicability: | All Model 727 series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                  |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the engine mount cone bolt nuts and remove from service any nut that is not identified in FAA AD 89-21-02 Amdt 39-6342; or,Inspect the engine mount cone bolt nuts to establish conformity to the cone bolt nuts identified and described in Boeing Service Letter (SL) 727-SL-71-014-C.Note: FAA Letter, reference 97-120S-490 (FAA Alternate Method of Compliance for FAA AD 89-21-02), and SL 727-SL-71-014-C refer. |\n| Compliance:    | Before each cone bolt nut installation, effective 1 September 2005.                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Amendment becomes effective on 1 September 2005.                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | The FAA determined that bogus nuts have been introduced and sold to aircraft repair stations and parts distributors world-wide.Amendment 1 is issued to introduce an alternate method of compliance to FAA AD 89-21-02, in order to use authentic cone bolt nuts manufactured by Standard Pressed Steel (SPS) Technologies that do not specifically conform to the part number description in AD 89-21-02.                      |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 July 2005","sortOrder":0},{"sectionNumber":"AD/B727/111 Amdt 1","sectionType":"part","heading":"AD/B727/111 Amdt 1","content":"## AD/B727/111 Amdt 1","sortOrder":1},{"sectionNumber":"Engine Mount Cone Bolt Nuts","sectionType":"part","heading":"Engine Mount Cone Bolt Nuts","content":"## Engine Mount Cone Bolt Nuts","sortOrder":2},{"sectionNumber":"9/2005","sectionType":"part","heading":"9/2005","content":"## 9/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment adds an alternate method of compliance to FAA AD 89‑21‑02 by permitting authentic Standard Pressed Steel (SPS) cone‑bolt nuts that do not specifically match the AD part‑number description. It does not change which aircraft are covered (all Model 727s) but changes which parts and compliance routes are acceptable; effective date is 1 September 2005."},"complexity_factors":["Cross-references to external documents (FAA AD 89-21-02, Boeing SL 727‑SL‑71‑014‑C and an FAA alternate compliance letter) — compliance depends on reading and applying those texts.","Universal applicability to all Model 727 series aircraft increases the number of affected operators and maintenance events.","Inspection required before each cone‑bolt nut installation creates a recurring operational burden and record‑keeping need.","Allowance of authentic SPS parts that do not match the AD part number introduces supply‑chain verification complexity when sourcing parts.","Determining whether a nut is ‘identified’ or ‘conforming’ relies on maintenance judgement and documentary evidence, raising potential ambiguity for technicians.","Obligation to remove non‑conforming parts imposes replacement costs and logistical arrangements for operators and repair stations.","Regulatory administration is by the Civil Aviation Safety Authority (delegate), so enforcement and interpretation rest with the regulator."],"plain_english_summary":"Airline operators and maintenance organisations for all Boeing 727s must inspect engine‑mount cone‑bolt nuts before each installation and remove any nut not identified in FAA AD 89‑21‑02, or confirm conformity to Boeing Service Letter 727‑SL‑71‑014‑C. This follows the FAA’s finding that counterfeit nuts entered the parts supply chain.\n\nOperators pay inspection and replacement costs and must source acceptable parts; the amendment permits authentic Standard Pressed Steel (SPS) nuts that do not match the original AD part‑number description. Compliance is required from 1 September 2005."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. It adds an alternative compliance method to accommodate authentic parts that were being incorrectly excluded, but does not expand beyond the original safety purpose of ensuring genuine engine mount nuts are used."},"complexity_factors":["Single, specific mechanical component targeted (engine mount cone bolt nuts)","Only 2 alternative compliance methods provided","No defined terms section","No cross-referencing to other Australian legislation","Straightforward effective date with no conditional triggers","Short document (approximately 200 words of substantive content)","Single applicability criterion (all Model 727 series aircraft)"],"plain_english_summary":"This airworthiness directive requires mechanics on all Boeing 727s to inspect and verify engine-mount cone bolt nuts before installation to stop counterfeit or nonconforming parts from being used. Mechanics must confirm nuts match the FAA AD 89-21-02 approved list or Boeing service-letter specifications.  \n\nIt matters because failed nuts can allow catastrophic engine separation, and the directive closes a rejection loophole that affected Standard Pressed Steel parts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts","history":"/api/acts/ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts/history","analysis":"/api/acts/ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts/analysis","conflicts":"/api/acts/ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts/conflicts","importantCases":"/api/acts/ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts/important-cases","documents":"/api/acts/ad-b727-111-amdt-1-engine-mount-cone-bolt-nuts/documents"}}