{"id":"F2006B03537","name":"AD/BAe 146/9 Amdt 1 - Steering Ring Cuff Nut","slug":"ad-bae-146-9-amdt-1-steering-ring-cuff-nut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43104,"registerId":"commonwealth-F2006B03537-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/9 Amdt 1 - Steering Ring Cuff Nut","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\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)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\n# AD/BAe 146/9\n\nAmdt 1\n\nApplicability: All models.\n\n# Steering Ring Cuff Nut 4/89\n\n \n\nRequirement: 1. Action in accordance with BAe SB 32-A95.\n\n \n\n2. Modify in accordance with BAe SB 32-95-70409A.\n\n \n\nNote: UK CAA AD 014-08-88 refers.\n\n \n\nCompliance: 1. As detailed in the Requirement Document.\n\n \n\n2. Prior to 30 June 1989.\n\n \n\nBackground: Insecurity of the steering cuff ring nut has resulted in unscrewing of the ring nut. This allows the steering cuff to drop resulting in a loss of nose wheel steering. Amdt 1 provides for terminating action.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment (Amdt 1) expands the directive’s required actions by adding a modifying action described in BAe SB 32-95-70409A as terminating action (Requirement: 2; Background). The AD therefore moves from prescribing action per BAe SB 32-A95 alone to requiring a specific modification to terminate the issue, and it sets a deadline for that modification (Compliance: 2)."},"complexity_factors":["Cross-reference to external technical documents (BAe SB 32-A95 and BAe SB 32-95-70409A) rather than including detailed technical steps (Requirement: 1–2).","Hard compliance deadline for the modification (Prior to 30 June 1989) that requires scheduling and resource allocation (Compliance: 2).","Applicability to all models of the BAe 146 series, increasing the universe of operators affected (Applicability: All models).","Limited information in the AD about verification, cost allocation, or enforcement mechanisms (no such details in Requirement or Compliance sections).","Reference to related foreign AD (UK CAA AD 014-08-88) which may require cross-jurisdictional consistency checks for operators with international arrangements (Note)."],"plain_english_summary":"This AD applies to all BAe 146 aeroplanes and mandates actions referenced in BAe service bulletins to inspect/repair and modify the nose‑wheel steering cuff ring nut assembly. It addresses reports of the ring nut unscrewing in service, which can drop the steering cuff and cause loss of nose‑wheel steering.\n\nOperators must follow the SBs and complete the specified modification by 30 June 1989; the AD does not allocate costs or detail enforcement or record‑keeping."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a single mechanical defect in a specific aircraft type. Amendment 1 did not expand the scope; it merely added a terminating action to complete the safety lifecycle of the original directive. The scope remains tightly limited to the steering ring cuff nut issue on BAe 146 aircraft."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 substantive requirements, both referencing external technical documents (Service Bulletins)","No defined terms section — relies entirely on industry-standard aviation terminology","Simple conditional structure: do X, then do Y by Z date","Single amendment adds only one concept (terminating action)","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) telling aircraft operators they must fix a specific mechanical problem.\n\n**What it does:** Orders owners and operators of British Aerospace BAe 146 series aircraft to address a dangerous fault with the nose wheel steering system. The \"steering ring cuff nut\" (a large fastener that holds part of the steering mechanism together) can work itself loose. If it unscrews completely, the steering cuff drops down and the pilots lose control of the nose wheel steering — a serious safety risk, especially during takeoff or landing.\n\n**Who must act:** Anyone operating any model of BAe 146 aircraft in Australia.\n\n**What must be done:**\n- **Follow the manufacturer's instructions:** Comply with British Aerospace Service Bulletin 32-A95 (the document that describes the problem and initial inspection).\n- **Install the permanent fix:** Modify the aircraft according to British Aerospace Service Bulletin 32-95-70409A (the engineering solution that prevents the nut from coming loose again).\n\n**When:**\n- The inspection and any immediate actions must follow the timeline in the Service Bulletin.\n- The permanent modification must be done **before 30 June 1989**.\n\n**Why \"Amendment 1\" matters:** This updated version adds a \"terminating action\" — meaning once you do the permanent modification, you're done. You don't have to keep inspecting or worrying about this specific problem forever.\n\n**Why it matters:** Loose nuts on landing gear aren't just maintenance headaches — they can cause loss of directional control on the runway, potentially leading to runway excursions, collisions, or crashes. This AD ensures every BAe 146 in Australia gets fixed before the nut fails."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-9-amdt-1-steering-ring-cuff-nut","history":"/api/acts/ad-bae-146-9-amdt-1-steering-ring-cuff-nut/history","analysis":"/api/acts/ad-bae-146-9-amdt-1-steering-ring-cuff-nut/analysis","conflicts":"/api/acts/ad-bae-146-9-amdt-1-steering-ring-cuff-nut/conflicts","importantCases":"/api/acts/ad-bae-146-9-amdt-1-steering-ring-cuff-nut/important-cases","documents":"/api/acts/ad-bae-146-9-amdt-1-steering-ring-cuff-nut/documents"}}