{"id":"F2006B04182","name":"AD/BEECH 76/7 - Aileron and Rudder Bellcrank Stop Bolt Nuts","slug":"ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43935,"registerId":"commonwealth-F2006B04182-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 76/7 - Aileron and Rudder Bellcrank Stop Bolt Nuts","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)  Beechcraft 76 (Duchess) Series Aeroplanes\n\n \n\nAD/BEECH 76/7 Aileron and Rudder Bellcrank Stop Bolt Nuts 12/79\n\nApplicability: As detailed in Beechcraft SI No. 1087. Requirement:  Action in accordance with Beechcraft SI No. 1087.\n\nCompliance: Within 25 hours’ time in service from 16 November 1979.\n\n \n\nBackground: There is a possibility that non self-locking nuts are fitted to the affected stop bolts.\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":2,"scope_assessment":{"changed":false,"description":"The instrument as presented does not indicate any change in scope from its stated purpose. It prescribes compliance with Beechcraft Service Instruction No. 1087 for the aircraft identified in that Service Instruction, to address the possibility that non self‑locking nuts are fitted to the affected stop bolts (Applicability; Requirement; Background; Compliance)."},"complexity_factors":["Instruction is short and directs actions to an external manufacturer Service Instruction (SI No. 1087) rather than specifying technical steps.","Single, narrowly framed compliance deadline (25 hours TIS from 16 Nov 1979) reduces procedural complexity but creates scheduling pressure.","Applicability is delegated to the Service Instruction, creating a dependency on an external document for scope details.","No alternative compliance methods or discretionary exemptions are provided in the AD text.","Limited factual content in the AD (identifies a single potential defect: non self‑locking nuts) reduces legal and interpretive ambiguity."],"plain_english_summary":"This AD requires operators of Beechcraft 76 (Duchess) aeroplanes to carry out the work specified in Beechcraft Service Instruction No. 1087 within 25 hours TIS from 16 November 1979 because non‑self‑locking nuts may have been fitted to aileron and rudder bellcrank stop bolts. It affects aircraft owners/operators who must arrange and fund the inspections/repairs per the SI; the AD points to the SI for applicability and technical details."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Extremely short document (under 150 words)","Only one substantive requirement: comply with an external technical document (Beechcraft SI No. 1087)","No defined terms section — relies entirely on external aircraft manufacturer documentation","Simple, single-layer compliance condition (time-in-service deadline)","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single applicability criterion referencing external service bulletin"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:** It orders owners and operators of **Beechcraft 76 \"Duchess\" series aeroplanes** to inspect and fix a specific mechanical problem. The issue involves **stop bolt nuts** on the **aileron and rudder bellcranks** (parts of the control system that help steer the plane). Some planes might have **non self-locking nuts** fitted where they shouldn't be — these could loosen over time and potentially cause control problems.\n\n**Who must act:** Anyone operating a Beechcraft 76 aircraft covered by Beechcraft Service Instruction No. 1087.\n\n**What they must do:** Follow the exact steps in Beechcraft Service Instruction No. 1087 to check and replace any faulty nuts.\n\n**When:** Within 25 hours of flying time after 16 November 1979.\n\n**Why it matters:** Loose nuts in flight control systems are extremely dangerous. This directive prevents potential loss of control by ensuring proper self-locking nuts are used."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts","history":"/api/acts/ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts/history","analysis":"/api/acts/ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts/analysis","conflicts":"/api/acts/ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts/conflicts","importantCases":"/api/acts/ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts/important-cases","documents":"/api/acts/ad-beech-76-7-aileron-and-rudder-bellcrank-stop-bolt-nuts/documents"}}