{"id":"F2006B02186","name":"AD/AC-112/2 - Wing Structural Life Limitation","slug":"ad-ac-112-2-wing-structural-life-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41416,"registerId":"commonwealth-F2006B02186-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-112/2 - Wing Structural Life Limitation","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 1/1976,Aircraft below 5700 kg,Gulfstream (Rockwell) 112 Series Aeroplanes,Wing Structural Life Limitation,2\ntitle: Airworthiness Directive - AD/AC-112/2 - Wing Structural Life Limitation\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)  Gulfstream (Rockwell) 112 Series Aeroplanes\n\n \n\nAD/AC-112/2 Wing Structural Life Limitation 1/76\n\nApplicability: All models with wing main spar caps exceeding 11200 hours’ time in service. Requirement:               Retire the wing main spar from service.\n\nCompliance: 30 January 1976.\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, time-bound safety directive issued in 1976. It has not grown beyond its original purpose — it remains a specific structural life limit for a particular aircraft series. The scope is exactly what it was intended to be: a hard retirement deadline for a critical component."},"complexity_factors":["Extremely short document (under 100 words of substantive content)","Zero defined terms requiring interpretation","No cross-references to other legislation or regulations","Simple binary applicability test (hours > 11,200? Yes/No)","Single unambiguous requirement with no exceptions or conditions","No procedural steps, appeal mechanisms, or alternative compliance methods"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a recall notice, but for aircraft parts.\n\n**What it does:** It orders the immediate retirement (permanent removal from use) of wing main spars on specific Gulfstream (Rockwell) 112 series aeroplanes once they exceed 11,200 flight hours.\n\n**Who it affects:** Owners and operators of Gulfstream (Rockwell) 112 series aircraft whose wing main spar caps have clocked more than 11,200 hours in service.\n\n**Why it matters:** The wing main spar is the backbone of the wing structure — if it fails, the wing can detach. This AD was triggered because structural analysis or incident data showed these components become unsafe beyond this hour limit. The compliance deadline (30 January 1976) made this immediate and non-negotiable — no extensions, no inspections, just replacement/retirement.\n\n**Key takeaway:** If your plane's wing spar hit 11,200 hours, you had to ground it or replace the wing by late January 1976. No exceptions."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies narrowly to the wing main spar caps of Gulfstream (Rockwell) 112 series aeroplanes that have exceeded 11,200 hours TIS and requires retirement by a specified date. The scope as written is narrowly targeted and consistent with the instrument’s stated mechanical effect (a life limitation on that component); there is no indication within the text that the scope departs from that original, component-specific intent."},"complexity_factors":["Single clear numeric threshold (11,200 hours TIS) reduces interpretive complexity","One unambiguous mandatory action (retire the wing main spar from service)","Fixed compliance date creates a straightforward deadline","Lack of procedural detail about replacement, certification, or exemptions increases practical implementation tasks but not legal complexity","Impacts depend on operational record-keeping accuracy and parts-market availability, adding logistical complexity for operators"],"plain_english_summary":"This Airworthiness Directive mandates retirement of the wing main spar on Gulfstream (Rockwell) 112-series aeroplanes once that component exceeds 11,200 hours’ time in service, with CASA setting a fixed compliance date (30 January 1976). It directly affects owners/operators, who bear replacement, downtime and resale-value costs, forces changes to maintenance and scheduling, and raises demand for replacement spars or wing assemblies while removing discretionary inspection relief."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-112-2-wing-structural-life-limitation","history":"/api/acts/ad-ac-112-2-wing-structural-life-limitation/history","analysis":"/api/acts/ad-ac-112-2-wing-structural-life-limitation/analysis","conflicts":"/api/acts/ad-ac-112-2-wing-structural-life-limitation/conflicts","importantCases":"/api/acts/ad-ac-112-2-wing-structural-life-limitation/important-cases","documents":"/api/acts/ad-ac-112-2-wing-structural-life-limitation/documents"}}