{"id":"F2007L03660","name":"AD/AS 355/85 Amdt 4 - Sliding Door Rear Fitting Pin","slug":"ad-as-355-85-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":70093,"registerId":"commonwealth-F2007L03660-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter AS 355 (Twin Ecureuil) Series","sectionType":"division","heading":"Eurocopter AS 355 (Twin Ecureuil) Series Helicopters","content":"### Eurocopter AS 355 (Twin Ecureuil) Series Helicopters\n\n| AD/AS 355/85 Amdt 4 | Sliding Door Rear Fitting Pin | 11/2007 DM |\n| ------------------- | ----------------------------- | ---------- |\n\n| Applicability: | Model AS 355 helicopters, versions E, F, F1, F2, and N; 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 355 Alert Service Bulletin (ASB) No. 05.00.45 original issue, or later EASA approved revision.2. Replace the roller support shaft and fitting of the left hand and/or right hand sliding doors in accordance with paragraph 2.B. of ASB No. 52.00.23 original issue, or later EASA approved revision.No person shall install, on any AS 355 helicopter, sliding doors listed in paragraph 1.A.2. of ASB No. 52.00.23 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. 52.00.23 Revision 1.No person shall install, on any AS 355 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 355 helicopter. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n12 September 2007","sortOrder":0},{"sectionNumber":"AD/AS 355/85 Amdt 4","sectionType":"part","heading":"AD/AS 355/85 Amdt 4","content":"## AD/AS 355/85 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":5,"scope_assessment":{"changed":true,"description":"Yes. The directive evolved from primarily requiring inspections to mandating replacement/modification in line with Eurocopter ASBs and now requires repetitive inspections until improved parts are fitted, plus a prohibition on installing certain roller support fittings (notably P/N 350A25-1270-22). Amendments converted requirements into ASB‑driven modification actions, altered compliance times, and added the installation ban in response to a later EASA AD."},"complexity_factors":["Technical specificity: mandates inspections and part replacements of particular components (rear roller support shaft and fittings) and cites exact part numbers (e.g. 350A25-1275-20, 350A25-1270-20, 350A25-1270-22).","Cross-references to external documents: directs compliance with Eurocopter ASB Nos. 05.00.45 and 52.00.23 (original issue or later EASA‑approved revisions) and cites an EASA AD, creating dependency on other instruments.","Variable compliance timing: different initial and repetitive inspection intervals depending on logged flight hours and fixed calendar deadlines (see Compliance), increasing scheduling complexity for operators.","Amendment history: multiple amendments changed requirements over time (inspection → mandated modification → repetitive inspections until replacement → installation prohibitions), requiring users to track current amendment.","Operational scope limits: applies only to specific AS 355 versions and to sliding doors installed pre‑MOD 073298/073308, so eligibility assessment is needed per helicopter.","Prohibition element: affirmative ban on installing certain parts tightens supply/maintenance choices and requires maintenance control to prevent non‑compliant installations."],"plain_english_summary":"This airworthiness directive tells operators of Eurocopter AS 355 E/F/F1/F2/N helicopters with pre‑MOD 073298/073308 sliding doors to inspect the rear sliding‑door roller support shaft and fitting for cracks, carry out repeated inspections at set flight‑hour intervals until improved parts are fitted, and bans installation of specified roller pins and fittings. Operators must follow Eurocopter Alert Service Bulletins for replacement work and meet the stated flight‑hour or date deadlines, so operators pay the maintenance and compliance costs."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original 1985 directive (implied by the numbering AD/AS 355/85) has grown significantly through four amendments. What began as a simple inspection requirement has expanded to include: mandatory replacement of parts, prohibition on installing specific part numbers, alignment with European EASA standards, and complex compliance timelines based on aircraft usage. Amendment 4 specifically adds installation prohibitions and repetitive inspection requirements that weren't in the original directive, shifting from purely corrective action to preventive regulatory control."},"complexity_factors":["Multiple amendment history (Amendment 4 of an original 1985 directive) with cross-references to previous amendments","Conditional compliance deadlines based on flight hours accumulated (90+ hours vs under 90 hours)","Dual-path requirements: repetitive inspections AND one-time replacement with different deadlines","Specific part number prohibitions (3 distinct part numbers referenced)","Cross-references to external documents: Eurocopter Alert Service Bulletins (ASB) No. 05.00.45 and 52.00.23, plus EASA AD 2007-0236","Left-hand/right-hand door differentiation (MOD 073298 vs MOD 073308)","Nested applicability criteria: specific helicopter models AND specific door configurations (pre-MOD status)"],"plain_english_summary":"This AD requires owners/operators of Eurocopter AS355 (E, F, F1, F2, N) helicopters with pre‑MOD sliding doors to inspect and replace the rear roller support pin and fitting because metallurgical tests found improper heat treatment leading to fatigue cracks and potential in‑flight door separation. It mandates repetitive inspections (110 flight‑hour interval), replacement of the affected parts by 30 September 2007, and bans reinstalling the old part numbers; it aligns Australian rules with EASA and tightens prior ADs."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-85-amdt-4-sliding-door-rear-fitting-pin","history":"/api/acts/ad-as-355-85-amdt-4-sliding-door-rear-fitting-pin/history","analysis":"/api/acts/ad-as-355-85-amdt-4-sliding-door-rear-fitting-pin/analysis","conflicts":"/api/acts/ad-as-355-85-amdt-4-sliding-door-rear-fitting-pin/conflicts","importantCases":"/api/acts/ad-as-355-85-amdt-4-sliding-door-rear-fitting-pin/important-cases","documents":"/api/acts/ad-as-355-85-amdt-4-sliding-door-rear-fitting-pin/documents"}}