{"id":"F2006B09310","name":"AD/EC 120/4 Amdt 1 - Cabin Sliding Door","slug":"ad-ec-120-4-amdt-1-cabin-sliding-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53421,"registerId":"commonwealth-F2006B09310-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EC 120/4 Amdt 1 - Cabin Sliding Door","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n![](image.002.png)  \nEurocopter EC 120 Series Helicopters\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/EC 120/4 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/EC 120/4\n\nAmdt 1\n\n  \n\nCabin Sliding Door 8/2001 DM\n\nApplicability: Model EC 120B helicopters having a serial number below 1170, with a rail not equipped with an end-of –travel anti-unhinging stop, rail part number C533C8102201, C533C8102202, C533C8103201, or C533C8103202; and without\n\nEurocopter EC 120 Alert Service Bulletin 52A004 R1 incorporated.\n\nRequirement: 1. Adjust the cabin sliding door in accordance with the instructions specified in paragraph 2.B of Eurocopter EC 120 Alert Service Bulletin 05A005 R1.\n\nFlight with the cabin sliding door in the open position is prohibited if the above adjustment does not ensure correct locking of the cabin sliding door in the open position.\n\nIn this case, remove the cabin door prior to carrying out a flight with the door open, and refer to the Aircraft Flight Manual for airspeed limitations.\n\n2. Modify the rear stop of the middle rail and add a stop to the front rail in accordance with paragraph 2.B of Eurocopter EC 120 Alert Service Bulletin 52A004 R1.\n\nNote 1: Compliance with Requirement 2 constitutes terminating action for the requirements of this Directive.\n\nNote 2: DGAC AD 2000-285-005(A) R2 refers.\n\nCompliance: 1. Before further flight with the cabin sliding door in the open position, but not later than 31 August 2000; thereafter at each installation of the cabin sliding door.\n\n2. Before 31 July 2001, unless already accomplished.\n\nThe compliance times/requirement of Compliance 1 remain unchanged by this issue. This Amendment becomes effective on 20 June 2001.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBackground: This Directive was initially issued following the in-flight loss of a cabin sliding door.\n\nAmendment 1 is issued in response to a new DGAC AD which introduces modification action and changes effectivity to clarify rail part numbers.\n\nThe original issue of this Airworthiness Directive became effective on 5 July 2000.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 14 June 2001\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 20 June 2001.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original AD (issued 5 July 2000) only required door adjustment and operational restrictions. Amendment 1 expands the scope significantly by adding a mandatory physical modification requirement (Requirement 2) with new hardware installation, changing the applicability criteria to specify exact rail part numbers, and introducing a terminating action that allows operators to permanently satisfy the directive. This transforms the AD from an ongoing operational restriction into a fix-then-close maintenance action."},"complexity_factors":["Multiple specific part numbers listed in applicability (4 distinct rail part numbers)","Cross-reference to two external Eurocopter Alert Service Bulletins (05A005 R1 and 52A004 R1)","Conditional logic: different requirements based on whether modification already accomplished","Nested conditions: Requirement 1 has a sub-condition about flight prohibition if adjustment fails","Reference to French aviation authority (DGAC) directive for context","Two separate compliance timelines with different deadlines and conditions"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Eurocopter EC 120B helicopters (S/Ns below 1170) with specified cabin sliding door rail parts to secure the door before flight — adjust the lock or remove the door if it won’t lock — and to install safety stops on the door rails by 31 July 2001. It was issued to prevent in‑flight door detachment after such an event; the amendment took effect 20 June 2001."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 revises the original AD by adding a required rail modification (constituting terminating action) and clarifying affected rail part numbers; it revokes the earlier AD and retains the original immediate flight-with-door-open compliance timing while adding the later modification deadline (Background; Note 1; Compliance)."},"complexity_factors":["Technical maintenance actions required (door adjustment and rail-stop modification) — Requirement 1 & 2","Applicability tied to specific airframe serial numbers and rail part numbers, requiring record checks — Applicability","Interaction with Eurocopter Alert Service Bulletins (ASB 05A005 R1 and 52A004 R1) as the method of compliance — Requirement","Conditional flight prohibition tied to successful adjustment, creating operational constraints and possible removal of the door — Requirement","Staged compliance deadlines (immediate-before-flight condition vs scheduled modification by a fixed date) — Compliance","Amendment revokes prior AD and establishes terminating action on completion of modification, affecting regulatory status — Background & Note 1"],"plain_english_summary":"This AD requires operators of Eurocopter EC 120B helicopters (serial numbers below 1170) with specified rail part numbers and without ASB 52A004 R1 incorporated to adjust the cabin sliding door per Eurocopter ASB 05A005 R1 and to modify rail stops per ASB 52A004 R1 (Applicability; Requirement). It prohibits flying with the door open unless the adjustment secures correct locking; otherwise the door must be removed and AFM airspeed limits observed. Compliance deadlines are set for the adjustment (before further flight with door open) and the rail modification (by 31 July 2001)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ec-120-4-amdt-1-cabin-sliding-door","history":"/api/acts/ad-ec-120-4-amdt-1-cabin-sliding-door/history","analysis":"/api/acts/ad-ec-120-4-amdt-1-cabin-sliding-door/analysis","conflicts":"/api/acts/ad-ec-120-4-amdt-1-cabin-sliding-door/conflicts","importantCases":"/api/acts/ad-ec-120-4-amdt-1-cabin-sliding-door/important-cases","documents":"/api/acts/ad-ec-120-4-amdt-1-cabin-sliding-door/documents"}}