{"id":"F2007L03661","name":"AD/ECUREUIL/109 Amdt 4 - Sliding Door Rear Fitting Pin","slug":"ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70095,"registerId":"commonwealth-F2007L03661-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter AS 350 (Ecureuil) Series Heli","sectionType":"division","heading":"Eurocopter AS 350 (Ecureuil) Series Helicopters","content":"### Eurocopter AS 350 (Ecureuil) Series Helicopters\n\n| AD/ECUREUIL/109 Amdt 4 | Sliding Door Rear Fitting Pin | 11/2007 DM |\n| ---------------------- | ----------------------------- | ---------- |\n\n| Applicability: | Model AS 350 helicopters, versions B, BA, BB, B1, B2, B3, and D, equipped with sliding door(s) pre-MOD 073298 and/or pre-MOD 073308. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Check the support shaft of the rear roller and the rear fitting of the sliding door(s) for cracks, in accordance with paragraph 2.B. of Eurocopter AS 350 Alert Service Bulletin (ASB) No. 05.00.47 original issue, or later EASA approved revision.2. Replace the roller support shaft and fitting(s) of the left hand and/or right hand sliding doors in accordance with paragraph 2.B. of ASB No. 52.00.30 original issue, or later EASA approved revision.No person shall install, on any AS 350 helicopter, sliding doors listed in paragraph 1.A.2. of ASB No. 52.00.30 Revision 1, or later EASA approved revision, unless these sliding doors have been modified per MOD 073298 for LH doors, and per MOD 073308 for RH doors, in accordance with ASB No. 52.00.30 Revision 1.No person shall install, on any AS 350 helicopter, rail roller pins part number 350A25-1275-20 and cast roller support fittings part numbers 350A25-1270-20 and 350A25-1270-22.Note: EASA AD 2007-0236 refers. |\n| Compliance: | 1. a. For aircraft equipped with sliding doors that have logged less than 90 flight hours:Upon accumulating 110 flight hours. Inspect thereafter at intervals not to exceed 110 flight hours.b. For aircraft equipped with sliding doors that have logged 90 or more flight hours:Unless the initial inspection is already accomplished, within 20 flight hours after 26 October 2006. Inspect thereafter at intervals not to exceed 110 flight hours. |\n\n| | 2. Unless already accomplished, before 30 September 2007.The compliance times remain unchanged by this issue of the Directive. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| | This Amendment becomes effective on 14 September 2007. |\n| Background: | The manufacturer received a report of failure and a report of cracking of the sliding door rear roller support pin. Investigation revealed that the cracks started from a spring pin bore and grew due to fatigue. Metallurgical analysis revealed heat treatment non-conformity of the pin material.Amendment 1 was prompted by reports of cracking and failure of the roller support shaft rear attaching fitting.Amendment 2 converted the Requirement document to an Alert Service Bulletin with the same reference number, and mandated modification action that cancels the inspection requirements of this Directive.Amendment 3 extended the compliance time for Requirements 2, 3, and 4.Amendment 4 is issued in response to a new EASA AD, which requires repetitive inspections until replacement of current parts with improved parts and also prohibits installation of another roller support fitting part number 350A25-1270-22 on anyAS 350 helicopter. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n12 September 2007","sortOrder":0},{"sectionNumber":"AD/ECUREUIL/109 Amdt 4","sectionType":"part","heading":"AD/ECUREUIL/109 Amdt 4","content":"## AD/ECUREUIL/109 Amdt 4","sortOrder":1},{"sectionNumber":"Sliding Door Rear Fitting Pin","sectionType":"part","heading":"Sliding Door Rear Fitting Pin","content":"## Sliding Door Rear Fitting Pin","sortOrder":2},{"sectionNumber":"11/2007 DM","sectionType":"part","heading":"11/2007 DM","content":"## 11/2007 DM","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"Yes. The directive's scope evolved across amendments: originally requiring inspections for cracked pins, Amendment 2 mandated modification action that could cancel inspections, Amendment 3 extended compliance times, and Amendment 4 (this issue) reintroduced repetitive inspections until improved parts are fitted and prohibited installation of part number 350A25‑1270‑22 (see Background and Requirement). Compliance timing and the balance between inspection and mandatory modification were altered by the amendments."},"complexity_factors":["Multiple technical references: cross‑references to Eurocopter Alert Service Bulletins (ASB No. 05.00.47 and 52.00.30) and an EASA AD","Applicability limited by airframe versions and pre‑MOD status (pre‑MOD 073298/073308), requiring record checks","Staged amendments that change requirement type and timing (inspection → mandated modification → repetitive inspections until replacement)","Mixed actions: repetitive inspections, mandatory part replacements, and installation prohibitions for specific part numbers","Layered compliance timelines (different flight‑hour thresholds and fixed calendar deadlines)","Technical inspection work (fatigue/crack detection) and parts replacement with specific part‑number controls increase operational and maintenance burden"],"plain_english_summary":"This airworthiness directive requires owners/operators of Eurocopter AS350 (B, BA, BB, B1, B2, B3, D) helicopters with sliding doors pre‑MOD 073298/073308 to inspect rear sliding‑door roller support shafts and fittings for cracks, replace defective rollers/fitments, and prohibits installing specified pin and fitting part numbers. (Requirement; Compliance). It responds to reported fatigue cracking and a heat‑treatment non‑conformity (Background). Operators pay inspection and replacement costs, must schedule recurring checks until improved parts are fitted, and follow specified compliance intervals and deadlines."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The legislation has evolved significantly from its original intent. Initially (original issue), it required inspections for cracks. Amendment 1 added requirements for the rear attaching fitting. Amendment 2 introduced a permanent modification option that could cancel inspection requirements. Amendment 3 extended compliance times. Amendment 4 now adds prohibitions on installing specific part numbers and maintains repetitive inspections as mandatory until replacement — effectively reversing the 'cancellation of inspections' pathway from Amendment 2 for operators who haven't yet modified their aircraft. The scope has expanded from 'inspect and optionally modify' to 'inspect repeatedly AND prohibit certain parts AND mandate eventual replacement'."},"complexity_factors":["Multiple amendment history (Amendment 4) with cross-references to previous amendments and their specific changes","Dual-path compliance structure: repetitive inspections OR permanent modification with different deadlines","Conditional applicability based on flight hours logged (90-hour threshold creates two compliance tracks)","Cross-references to external technical documents: Eurocopter Alert Service Bulletins ASB 05.00.47 and ASB 52.00.30 with specific paragraph references","Specific part number prohibitions (three distinct part numbers) and modification status requirements (MOD 073298/073308)","Nested effective dates: original directive, Amendment 4 effective date (14 September 2007), and compliance deadline (30 September 2007)","Left-hand/right-hand door differentiation (LH vs RH) with different modification standards"],"plain_english_summary":"This Airworthiness Directive orders mandatory inspections and part changes for certain Eurocopter AS350 (Squirrel/Ecureuil) helicopters with unmodified sliding doors because the rear roller support pin and fitting can fatigue-crack and allow a door to detach in flight. It affects operators and maintenance crews: repetitive inspections are required (every 110 flight hours) until improved parts are fitted by the compliance date, and specified unmodified pins/fittings and doors are prohibited. This fourth amendment tightens previous measures after in-service failures and an EASA AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin","history":"/api/acts/ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin/history","analysis":"/api/acts/ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin/analysis","conflicts":"/api/acts/ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin/conflicts","importantCases":"/api/acts/ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin/important-cases","documents":"/api/acts/ad-ecureuil-109-amdt-4-sliding-door-rear-fitting-pin/documents"}}