{"id":"F2006B10414","name":"AD/HS 125/134 Amdt 1 - Cabin Door Retainer Catch","slug":"ad-hs-125-134-amdt-1-cabin-door-retainer-catch","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116091,"registerId":"commonwealth-F2006B10414-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/134 Amdt 1 - Cabin Door Retainer Catch","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)  \nBritish Aerospace BAe 125 Series Aeroplanes\n\nAD/HS 125/134\n\nAmdt 1\n\n  \nCabin Door Retainer Catch 5/98\n\nApplicability: Model 125 series 800 with serial numbers as listed in the Requirement Document.\n\nRequirement: Action in accordance with British Aerospace Mandatory Service Bulletin 25-68- 25A440A.\n\nNote: UK CAA AD 004-08-92 refers.\n\nCompliance: Prior to 30 September 1993.\n\nThe compliance of the original issue of this directive remains unchanged. This amendment becomes effective on 23 April 1998.\n\nBackground: This Directive requires the existing cabin door retainer catch fitted in the upper luggage bay shelf to be replaced by an improved catch in order to prevent closing of the door during take off and landing.\n\nAmendment 1 is issued to re-instate this directive to the series.\n\nThe original issue of this Airworthiness Directive became effective on 30 September 1993.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a straightforward re-instatement of an existing airworthiness directive. The amendment does not expand the scope beyond the original intent — it simply restores the directive to active status for the specified aircraft series. The original purpose (fixing a specific door catch defect) remains unchanged."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined term implicitly referenced (the 'Requirement Document' for serial numbers)","Single mechanical action required with clear external reference to manufacturer service bulletin","No nested conditions, exceptions, or cross-references to other legislation beyond a single note about UK CAA AD","Simple temporal compliance structure (single deadline)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) telling aircraft owners and operators they must fix a specific mechanical problem.\n\n**What it does:** Requires owners of specific British Aerospace BAe 125 series 800 aircraft to replace a faulty cabin door retainer catch in the upper luggage bay with an improved version. The original catch could fail and let the door close unexpectedly during takeoff or landing — a serious safety risk.\n\n**Who it affects:** Owners and operators of BAe 125 series 800 aircraft with specific serial numbers (listed in the referenced British Aerospace service bulletin).\n\n**Key details:**\n- **What must be done:** Replace the door catch following British Aerospace Mandatory Service Bulletin 25-68-25A440A\n- **When:** Before 30 September 1993 (for original issue); this amended version took effect on 23 April 1998\n- **Why the amendment:** This update (Amendment 1) simply puts the directive back into force — it \"re-instates\" it to the series after apparently being removed or lapsed\n\n**Why it matters:** A door closing unexpectedly during critical flight phases could injure crew, damage equipment, or distract pilots. This ensures a known hardware defect gets fixed across the affected fleet."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 re‑instates the original directive to the series but explicitly states that the compliance requirements of the original issue remain unchanged (Background). In effect, the applicable fleet, the required action (replacement per the manufacturer’s Service Bulletin), and the original compliance obligation are unchanged; the amendment updates the directive’s status and records an effective date of 23 April 1998 while noting the original directive became effective on 30 September 1993 (Background, Compliance)."},"complexity_factors":["Narrow technical scope limited to a single component (cabin door retainer catch) on a specific aircraft model and listed serial numbers (Applicability, Requirement).","Mandatory incorporation of an external technical document (British Aerospace Mandatory Service Bulletin 25-68-25A440A) rather than including procedures in the directive itself (Requirement).","Fixed compliance deadline creates a binary compliance obligation (Compliance: prior to 30 September 1993).","Cross-reference to an overseas regulator’s AD (UK CAA AD 004-08-92) requiring operators to consult multiple documents (Note).","Administrative history: the amendment re-instated the directive and sets an amendment effective date separate from the original effective date, which requires attention to versioning (Background)."],"plain_english_summary":"The directive requires owners/operators of specified BAe 125 Series 800 aircraft to replace the upper luggage‑bay cabin door retainer catch with an improved unit per British Aerospace Mandatory Service Bulletin 25‑68‑25A440A. The retrofit, at the operator’s expense, is intended to prevent the cabin door closing during takeoff and landing and must have been completed by the stated compliance date (originally 30 Sep 1993; amendment re‑instated on 23 Apr 1998)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-134-amdt-1-cabin-door-retainer-catch","history":"/api/acts/ad-hs-125-134-amdt-1-cabin-door-retainer-catch/history","analysis":"/api/acts/ad-hs-125-134-amdt-1-cabin-door-retainer-catch/analysis","conflicts":"/api/acts/ad-hs-125-134-amdt-1-cabin-door-retainer-catch/conflicts","importantCases":"/api/acts/ad-hs-125-134-amdt-1-cabin-door-retainer-catch/important-cases","documents":"/api/acts/ad-hs-125-134-amdt-1-cabin-door-retainer-catch/documents"}}