{"id":"F2007L02437","name":"AD/ATR 42/13 - MLG Swinging Lever Spacer","slug":"ad-atr-42-13-mlg-swinging-lever-spacer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67887,"registerId":"commonwealth-F2007L02437-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 42/13 | MLG Swinging Lever Spacer | 9/2007 |\n| ------------ | ------------------------- | ------ |\n\n| Applicability: | Model ATR 42-200, -300, -320, -400, and -500 series aircraft, without ATR modification 5338 (Service Bulletin ATR42-32-0094) incorporated.                                                                                                                                                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of DGAC AD 2001-614-089(B).Note: ATR Service Bulletin ATR42-32-0094 original issue, or later DGAC/EASA approved revision, refers.                                                                                                                                                                                                                    |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of30 August 2007.                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 30 August 2007.                                                                                                                                                                                                                                                                                                                               |\n| Background:    | Reports were received of fatigue cracks on the main landing gear swinging lever spacer. Propagation of cracks could result in failure of the spacer base and potentially affect, during some operating phases, the symmetrical functioning of the braking system. This asymmetrical braking could result in reduced aircraft controllability, in the case of a strong crosswind during landing. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n10 July 2007","sortOrder":0},{"sectionNumber":"AD/ATR 42/13","sectionType":"part","heading":"AD/ATR 42/13","content":"## AD/ATR 42/13","sortOrder":1},{"sectionNumber":"MLG Swinging Lever Spacer","sectionType":"part","heading":"MLG Swinging Lever Spacer","content":"## MLG Swinging Lever Spacer","sortOrder":2},{"sectionNumber":"9/2007","sectionType":"part","heading":"9/2007","content":"## 9/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive (approximately 200 words of substantive content)","Only one defined applicability criterion (aircraft model and modification status)","Single cross-reference to external technical document (DGAC AD 2001-614-089(B))","No nested conditional logic or exceptions within the directive itself","Technical aviation terminology requires domain knowledge but is standard for the field","Compliance date is straightforward (single fixed date: 30 August 2007)"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of ATR 42-200/-300/-320/-400/-500 aircraft (unless already modified per SB ATR42‑32‑0094/Mod 5338) to inspect and repair the main landing gear swinging lever spacer because fatigue cracks have been found. Cracked spacers can cause asymmetric braking and loss of control—especially on crosswind landings. Compliance follows the inspection/repair procedures in DGAC AD 2001‑614‑089(B) (as amended)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD limits its obligation to ATR 42-200/300/320/400/500 series aeroplanes that do NOT have ATR modification 5338; thus the measure narrows affected aircraft compared with a universal requirement and concentrates compliance on airframes lacking that modification (Applicability)."},"complexity_factors":["Incorporation by reference to external mandatory document (DGAC AD 2001-614-089(B)) rather than reproducing technical steps in the AD (Requirement).","Cross-reference to a manufacturer service bulletin (ATR42-32-0094) as the procedural source creates dependency on that document's revisions (Requirement, Note).","Applicability carve-out—aircraft with ATR modification 5338 are excluded, so operators must determine modification status for each airframe (Applicability).","Safety-critical technical work (inspection/repair of main landing-gear swinging-lever spacer) requires maintenance resources, parts and certified personnel (Background; Requirement).","Fixed compliance/effective date imposes a time-bound operational and cost obligation on operators (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of ATR 42-200/300/320/400/500 series aircraft that have not incorporated ATR modification 5338 to carry out the inspections and corrective actions specified in DGAC AD 2001-614-089(B). It is effective 30 August 2007 (Requirement; Applicability; Compliance). It responds to reported fatigue cracks in the main landing-gear swinging-lever spacer that can lead to asymmetric braking and reduced controllability in strong crosswinds (Background). Aircraft owners/operators pay to comply; CASA enforces the AD (Compliance; Requirement)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-atr-42-13-mlg-swinging-lever-spacer","history":"/api/acts/ad-atr-42-13-mlg-swinging-lever-spacer/history","analysis":"/api/acts/ad-atr-42-13-mlg-swinging-lever-spacer/analysis","conflicts":"/api/acts/ad-atr-42-13-mlg-swinging-lever-spacer/conflicts","importantCases":"/api/acts/ad-atr-42-13-mlg-swinging-lever-spacer/important-cases","documents":"/api/acts/ad-atr-42-13-mlg-swinging-lever-spacer/documents"}}