{"id":"F2006B04180","name":"AD/BEECH 76/5 - Main Landing Gear Fork Pin","slug":"ad-beech-76-5-main-landing-gear-fork-pin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43933,"registerId":"commonwealth-F2006B04180-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 76/5 - Main Landing Gear Fork Pin","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 76/5 Main Landing Gear Fork Pin 8/79\n\nApplicability: All model 76 with S/Nos. ME-1 to ME-228. Requirement:  Action in accordance with Beechcraft SI No. 1073.\n\nCompliance: Within 50 hours’ time in service, unless already accomplished, after 28 August 1979.\n\n \n\nBackground: Failure of the existing fork pin retaining pin could result in separation of the wheel and fork assembly.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"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 purpose of mandating a fork pin inspection/replacement."},"complexity_factors":["Single, specific mechanical component addressed (main landing gear fork pin)","No defined terms section — uses plain language and references external technical document by number only","No conditional logic, exceptions, or nested provisions","Extremely short — approximately 100 words of substantive content","Simple applicability test: serial number range only (ME-1 to ME-228)","Single compliance deadline with one straightforward exception ('unless already accomplished')","No cross-references to other legislation beyond parenthetical mention of Civil Aviation Regulations 1998, Part 39"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners to fix a specific mechanical problem.\n\n**What it does:** It orders owners of certain **Beechcraft 76 \"Duchess\" aeroplanes** (specifically serial numbers ME-1 through ME-228) to inspect and repair the **main landing gear fork pin** following instructions in Beechcraft Service Instruction No. 1073.\n\n**Why it matters:** The existing retaining pin on the fork pin could fail, causing the **wheel and fork assembly to separate** — a potentially catastrophic failure during takeoff, landing, or taxiing that could lead to loss of control and crash.\n\n**Who must comply:** Anyone operating or maintaining these specific Beechcraft 76 aircraft.\n\n**When:** The work had to be done within **50 hours of flight time** after 28 August 1979, unless already completed.\n\n**Key point:** This is a **retrospective safety fix** — it applies to aircraft already in service, not just new ones. Ignoring it would violate civil aviation law and put lives at risk."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The document sets a clear applicability (Model 76, S/N ME-1 to ME-228) and a single, time‑limited compliance requirement referencing Beechcraft SI No. 1073. The source text contains no indication that this directive changes scope from an earlier instrument or intent; it defines the scope directly rather than amending a prior scope."},"complexity_factors":["Reference to an external technical document (Beechcraft SI No. 1073) for the full procedural detail rather than containing step‑by‑step instructions in the directive itself (Requirement).","Time‑based compliance measured in hours time in service (50 hours) requiring operators to schedule work and maintain accurate flight/usage records (Compliance).","Applicability limited to a specific serial-number range (ME-1 to ME-228), concentrating the directive’s impact on a defined subset of owners/operators (Applicability).","Safety‑critical mechanical nature of the issue (risk of wheel/fork separation) which requires qualified maintenance action and creates potential operational downtime (Background; Requirement).","The directive is short and prescriptive in outcome but delegates technical specifics to the manufacturer, creating potential for implementation ambiguity or dependency on the SI’s availability and clarity (Requirement)."],"plain_english_summary":"Requires inspection/modification of the Model 76 main landing gear fork pin per Beechcraft Service Instruction No. 1073 for aircraft serials ME-1 to ME-228, to be done within 50 hours TIS after 28 August 1979. Owners/operators and maintenance providers must schedule and fund the work to prevent possible wheel/fork separation; the regulator mandates compliance while delegating procedural detail to the manufacturer’s service instruction."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-76-5-main-landing-gear-fork-pin","history":"/api/acts/ad-beech-76-5-main-landing-gear-fork-pin/history","analysis":"/api/acts/ad-beech-76-5-main-landing-gear-fork-pin/analysis","conflicts":"/api/acts/ad-beech-76-5-main-landing-gear-fork-pin/conflicts","importantCases":"/api/acts/ad-beech-76-5-main-landing-gear-fork-pin/important-cases","documents":"/api/acts/ad-beech-76-5-main-landing-gear-fork-pin/documents"}}