{"id":"F2006B05475","name":"AD/PA-23/49 - Stabilator Bungee - Installation","slug":"ad-pa-23-49-stabilator-bungee-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46271,"registerId":"commonwealth-F2006B05475-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-23/49 - Stabilator Bungee - Installation","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)  Piper PA-23 (Apache and Aztec) Series Aeroplanes\n\n \n\nAD/PA-23/49 Stabilator Bungee - Installation 1/72\n\nApplicability: Model PA-23-250 with S/Nos. 27-4575 to 27-4587, 27-4589 to 27-4620, 27-4622\n\nto 27-4672, 27-4674 to 27-4682, 27-4684 to 27-4694.\n\n \n\nDocument:  Piper SB No. 345. Compliance: Before 28 April 1972.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No change in scope from the instrument itself is evident in the supplied text. The directive applies to the specific PA-23-250 serial numbers listed and requires installation of the stabilator bungee per Piper SB No. 345 by 28 April 1972 (Applicability; Document: Piper SB No. 345; Compliance)."},"complexity_factors":["Very narrow applicability: applies only to specific Model PA-23-250 aircraft by serial number (Applicability).","Single, discrete action required: install stabilator bungee per a single referenced document (Document: Piper SB No. 345).","Clear, short compliance deadline: a fixed date is specified (Compliance: Before 28 April 1972).","Dependence on an external technical document for implementation details: the AD references the service bulletin but does not include the technical instructions within the AD text (Document: Piper SB No. 345).","Limited procedural or discretionary content in the AD text: the directive prescribes the action and deadline but does not state exemptions, enforcement processes, or alternative methods (Applicability; Document/Compliance)."],"plain_english_summary":"This Airworthiness Directive mandates installation of a stabilator bungee on specified Piper PA‑23‑250 aircraft (listed by serial number) by following Piper Service Bulletin No. 345, with work to be completed before 28 April 1972. It binds the listed owners/operators to a narrow, time‑limited technical modification (costs, parts and downtime borne by them) and relies on the referenced service bulletin for implementation details; the AD itself gives no safety rationale or cost/enforcement specifics."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue Airworthiness Directive from 1972 addressing one specific safety modification. It has not expanded beyond its original purpose of mandating the stabilator bungee installation on the specified aircraft serial numbers."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined elements: applicability (specific serial numbers), reference document (Piper SB No. 345), and compliance deadline","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Single, unconditional requirement with no exceptions or nested conditions","Technical content limited to one specific mechanical installation task","Clear, fixed compliance date with no alternative compliance methods stated"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Piper PA-23 Apache and Aztec aircraft to install a 'stabilator bungee' (a spring mechanism that helps control the aircraft's tail surface) according to Piper Service Bulletin No. 345.\n\n**Who it affects:**\n- Owners and operators of Piper PA-23-250 model aircraft with specific serial numbers (ranging from 27-4575 to 27-4694, with some gaps)\n\n**What they must do:**\n- Install the stabilator bungee as specified in Piper Service Bulletin No. 345\n- Complete this work **before 28 April 1972**\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. They are issued when a safety defect or unsafe condition is discovered in an aircraft type. Non-compliance means the aircraft cannot legally fly in Australian airspace. This particular directive addresses a specific technical issue with the stabilator (the movable tail surface that controls pitch) on these particular Piper aircraft to ensure safe flight operations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-49-stabilator-bungee-installation","history":"/api/acts/ad-pa-23-49-stabilator-bungee-installation/history","analysis":"/api/acts/ad-pa-23-49-stabilator-bungee-installation/analysis","conflicts":"/api/acts/ad-pa-23-49-stabilator-bungee-installation/conflicts","importantCases":"/api/acts/ad-pa-23-49-stabilator-bungee-installation/important-cases","documents":"/api/acts/ad-pa-23-49-stabilator-bungee-installation/documents"}}