{"id":"F2007L02439","name":"AD/ATR 42/15 - Wing Inner Skin Surface at Rear Spar Junction","slug":"ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67892,"registerId":"commonwealth-F2007L02439-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Avions de Transport Regional ATR 42 Seri","sectionType":"division","heading":"Avions de Transport Regional ATR 42 Series Aeroplanes","content":"### Avions de Transport Regional ATR 42 Series Aeroplanes\n\n| AD/ATR 42/15 | Wing Inner Skin Surface at Rear Spar Junction | 9/2007 |\n| ------------ | --------------------------------------------- | ------ |\n\n| Applicability: | Model ATR 42-300 and -320 aircraft, serial numbers 3 through 59.                                                         |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the requirements of DGAC AD 98-147-075(B).                                                     |\n| Compliance:    | Before the accumulation of 33,000 flights.                                                                               |\n|                | This Airworthiness Directive becomes effective on 30 August 2007.                                                        |\n| Background:    | This Directive requires fastener hole cold-working in order to prevent the initiation and development of fatigue damage. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n10 July 2007","sortOrder":0},{"sectionNumber":"AD/ATR 42/15","sectionType":"part","heading":"AD/ATR 42/15","content":"## AD/ATR 42/15","sortOrder":1},{"sectionNumber":"Wing Inner Skin Surface at Rear Spar Jun","sectionType":"part","heading":"Wing Inner Skin Surface at Rear Spar Junction","content":"## Wing Inner Skin Surface at Rear Spar Junction","sortOrder":2},{"sectionNumber":"9/2007","sectionType":"part","heading":"9/2007","content":"## 9/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope is limited to ATR 42-300 and -320 aircraft serials 3–59 and requires the specified cold‑working action per DGAC AD 98-147-075(B) before 33,000 flights. The instrument does not expand applicability beyond those models/serials or alter the stated compliance metric."},"complexity_factors":["Single, narrowly framed requirement: cold‑working of fastener holes (Requirement: DGAC AD 98-147-075(B)).","Applicability limited by model and serial number (Model ATR 42-300 and -320, serials 3–59).","Compliance measured by flight count deadline (before accumulation of 33,000 flights).","Cross‑reference to foreign airworthiness directive (DGAC AD 98-147-075(B)) — requires operators to follow an external technical document.","Clear effective date and enforcing authority (becomes effective 30 August 2007; David Villiers, Delegate of CASA).","Operational implications: scheduling, record‑keeping and maintenance cost burdens fall on aircraft operators."],"plain_english_summary":"**What this AD does:** Requires owners/operators of ATR 42-300 and -320 aircraft (serial numbers 3–59) to have the wing rear-spar inner-skin fastener holes cold‑worked in line with DGAC AD 98-147-075(B). The work must be done before the aircraft reaches 33,000 flights and the AD took effect 30 August 2007. Operators pay for and schedule the maintenance; the rule enforces a technical fatigue‑mitigation action and cross‑references a foreign authority’s procedure."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive with a single, specific safety purpose. It has not expanded beyond its original intent of addressing a known fatigue issue in a specific aircraft component."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (DGAC AD — the French authority's directive)","Single, unambiguous compliance requirement with no exceptions or conditional logic","Clear applicability criteria (specific models and serial number range)","No cross-references to other Australian legislation or regulations","Straightforward deadline (flight count threshold)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners/operators of certain ATR 42 regional aircraft to perform a specific maintenance procedure called **\"fastener hole cold-working\"** on the wing inner skin where it meets the rear spar (a major structural component).\n\n**Why it matters:**\n- This procedure prevents **fatigue damage** — tiny cracks that develop in metal over repeated stress cycles (takeoffs and landings). Without this fix, structural failure could occur.\n\n**Who it affects:**\n- Operators of **ATR 42-300 and -320 model aircraft** with serial numbers 3 through 59.\n\n**When it must be done:**\n- Before the aircraft completes **33,000 flights**.\n\n**Key point:** This directive adopts a French aviation safety requirement (DGAC AD 98-147-075(B)) and makes it legally binding in Australia."}},"importantCases":[],"_links":{"self":"/api/acts/ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction","history":"/api/acts/ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction/history","analysis":"/api/acts/ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction/analysis","conflicts":"/api/acts/ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction/conflicts","importantCases":"/api/acts/ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction/important-cases","documents":"/api/acts/ad-atr-42-15-wing-inner-skin-surface-at-rear-spar-junction/documents"}}