{"id":"F2006B04190","name":"AD/BEECH 77/14 - Rudder Balance Weight","slug":"ad-beech-77-14-rudder-balance-weight","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43944,"registerId":"commonwealth-F2006B04190-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 77/14 - Rudder Balance Weight","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 77 (Skipper) Series Aeroplanes\n\n \n\nAD/BEECH 77/14 Rudder Balance Weight 12/83\n\nApplicability: All model 77 with S/Nos. WA-1 to WA-312. Requirement:  1. Inspect rudder balance weight attachments for security.\n\n2. Modify I.A.W. Beechcraft S.I No. 1256.\n\n \n\nCompliance: 1. Within 25 hours’ time in service after 4 November 1983 and thereafter at intervals not exceeding 25 hours’ time in service until modified.\n\n \n\n2. Prior to 31 December 1983.\n\n \n\nBackground: To provide a reinforced attachment of the rudder balance weight.\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":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on rudder balance weight attachments for one aircraft model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 2 substantive requirements with clear deadlines","Single defined applicability criterion (serial number range)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","No conditional logic or nested exceptions","Technical reference to external document (Beechcraft Service Instruction No. 1256) but this is standard aviation practice"],"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 specific aircraft.\n\n**What it does:** It orders owners and operators of certain Beechcraft 77 \"Skipper\" aeroplanes (serial numbers WA-1 through WA-312) to:\n- **Inspect** the rudder balance weight attachments every 25 flight hours to check they're secure\n- **Modify** the aircraft according to Beechcraft Service Instruction No. 1256 to reinforce how the rudder balance weight is attached\n\n**Who it affects:** Anyone who owns, operates, or maintains these specific Beechcraft 77 aircraft.\n\n**Why it matters:** The rudder balance weight is a critical component that helps stabilise the aircraft's steering. If the attachment fails, the pilot could lose control of the rudder — a serious safety risk. This directive prevents that by catching problems early and requiring a permanent fix.\n\n**Deadlines:**\n- Inspections must start within 25 flight hours after 4 November 1983 and repeat every 25 hours until the modification is done\n- The modification must be completed before 31 December 1983"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is consistent with its stated purpose: it applies to a defined set of Beechcraft 77 serial numbers and prescribes inspections and a specific modification to provide a reinforced rudder balance weight attachment (Applicability; Requirement; Background). There is no indication in the text that the scope extends beyond these aircraft or that its intended technical objective has been altered."},"complexity_factors":["Narrow applicability limited to Beechcraft 77 serial numbers WA-1 to WA-312 (Applicability)","Short inspection interval (every 25 hours TIS) until modification is completed (Compliance, item 1)","Mandatory modification must follow an external manufacturer document (Beechcraft S.I. No. 1256) rather than being fully specified in the directive (Requirement, item 2)","Fixed calendar deadline for modification (31 December 1983) that may create scheduling and supply pressures (Compliance, item 2)","Operational record-keeping and maintenance coordination required while inspections continue (Compliance, item 1)"],"plain_english_summary":"This directive forces owners/operators of Beechcraft 77 (Skipper) serial WA‑1 through WA‑312 to inspect rudder balance weight attachments every 25 hours TIS until they complete a mandated modification per Beechcraft Service Instruction No. 1256, with the mod due by 31 Dec 1983. Operators bear the costs and scheduling burden; the rule aims to reinforce the attachment and creates an incentive to complete the modification quickly to stop recurring inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-77-14-rudder-balance-weight","history":"/api/acts/ad-beech-77-14-rudder-balance-weight/history","analysis":"/api/acts/ad-beech-77-14-rudder-balance-weight/analysis","conflicts":"/api/acts/ad-beech-77-14-rudder-balance-weight/conflicts","importantCases":"/api/acts/ad-beech-77-14-rudder-balance-weight/important-cases","documents":"/api/acts/ad-beech-77-14-rudder-balance-weight/documents"}}