{"id":"F2006B10066","name":"AD/G159/21 - Wing Rear Beam Upper Cap Splice Angles - Inspection","slug":"ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55511,"registerId":"commonwealth-F2006B10066-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G159/21 - Wing Rear Beam Upper Cap Splice Angles - Inspection","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 ORDERS CIVIL AVIATION SAFETY AUTHORITY                            PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES\n\n \n\nAD/G159/21 Wing Rear Beam Upper Cap Splice Angles - Inspection 6/73\n\nApplicability: All models.\n\n \n\nDocument: Grumman Customer Bulletin No. 230.\n\n \n\nCompliance: Unless already accomplished, before next issue of MR or 31 July 1973 whichever occurs first and thereafter at intervals not exceeding 1 year.\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\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the supplied text alone, the directive's scope is explicit and applies to \"All models\" of the G.159 series and prescribes initial and annual inspection timing. The excerpt contains no indication that the scope has been expanded or narrowed relative to an earlier version; no amendment history or prior scope is supplied, so no change is evident in this text."},"complexity_factors":["Cross-reference to an external manufacturer document (Grumman Customer Bulletin No. 230) for procedural detail rather than including steps in the directive.","Ambiguous abbreviated term: \"MR\" is used to set an initial deadline but is not defined in the supplied text.","Recurring compliance obligation (annual inspections) creates ongoing administrative and scheduling burden.","Applicability to all models increases operational scope and potential number of affected aircraft.","Lack of specified corrective actions or acceptance criteria in the supplied excerpt — reliance on external document for technical standards."],"plain_english_summary":"This directive mandates inspection of the wing rear beam upper cap splice angles on all Gulfstream (Grumman) G.159 aeroplanes, to be carried out per Grumman Customer Bulletin No. 230. If not already done, inspect before the next issue of MR or by 31 July 1973, then repeat at intervals not exceeding one year. It affects all owners/operators and maintenance organisations; inspection costs, repairs and downtime are borne by operators under the Civil Aviation Safety Authority’s directive."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive issued in 1973. It has not expanded beyond its original purpose of mandating a specific structural inspection for one aircraft type. The scope remains precisely as intended: a targeted safety intervention for a known potential defect."},"complexity_factors":["Extremely short document — only 4 substantive paragraphs","No defined terms section; all language is plain operational English","Single compliance requirement with clear deadline and recurring interval","No cross-references to other legislation or regulations","No conditional logic, exceptions, or nested provisions","References only one external technical document (Grumman Customer Bulletin No. 230) without incorporating its contents"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:**\n- Requires owners and operators of **Gulfstream (Grumman) G.159 series aeroplanes** to inspect the **wing rear beam upper cap splice angles** — a structural component where parts of the wing's main support beam are joined together.\n- The inspection must check for cracks, corrosion, or other damage that could weaken the wing structure.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a Gulfstream G.159 aircraft in Australia.\n\n**When it must be done:**\n- Before the next issue of the aircraft's Maintenance Release (MR) — the official document certifying an aircraft is safe to fly — or by **31 July 1973**, whichever comes first.\n- After that, the inspection must be repeated **at least once every year**.\n\n**Why it matters:**\nWing structure failures can be catastrophic. This directive was issued because Grumman (the manufacturer) identified a potential safety issue with these splice angles. The AD makes the inspection legally mandatory in Australia to prevent accidents caused by structural fatigue or corrosion."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection","history":"/api/acts/ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection/history","analysis":"/api/acts/ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection/analysis","conflicts":"/api/acts/ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection/conflicts","importantCases":"/api/acts/ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection/important-cases","documents":"/api/acts/ad-g159-21-wing-rear-beam-upper-cap-splice-angles-inspection/documents"}}