{"id":"F2006B10417","name":"AD/HS 125/137 - Oxygen System Inspection","slug":"ad-hs-125-137-oxygen-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116097,"registerId":"commonwealth-F2006B10417-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/137 - Oxygen System Inspection","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 125/137 Oxygen System Inspection 4/93\n\nDM\n\nApplicability: All BAe 125 Series 1000 aircraft identified in Corporate Jets Limited Service Bulletin\n\nS.B. 35-36 dated 7 January 1993.\n\nRequirement: Action in accordance with the Accomplishment Instructions of Corporate Jets Limited Service Bulletin S.B. 35-36 dated 7 January 1993.\n\nNote: This Service Bulletin has been classified as Mandatory by the CAA(UK), AD 022-01-93 dated 25 January 1993 refers.\n\nCompliance: Prior to 5 March 1993.\n\nBackground: This Directive has been issued following reports of chafing between the nose wheel steering control chain and oxygen pipe assembly 25-9SF61-125A. Compliance with this Directive will prevent damage being caused to the oxygen pipe by nose wheel steering control chain operation.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive addressing a specific safety issue on a specific aircraft type. It has not expanded beyond its original purpose of mandating an oxygen system inspection."},"complexity_factors":["Single, specific aircraft type and series (BAe 125 Series 1000)","Only one external document reference (Service Bulletin S.B. 35-36)","Single, straightforward mechanical issue (chafing between two components)","No defined terms section","No conditional logic or nested exceptions","Clear, fixed compliance deadline","Total length is approximately 150 words"],"plain_english_summary":"This is a **safety order for a specific type of aircraft** — the British Aerospace BAe 125 Series 1000 business jet.\n\n**What it does:**\nIt requires owners and operators of these planes to inspect and fix a specific mechanical problem. The issue is that a nose wheel steering chain is rubbing against (\"chafing\") an oxygen pipe, which could damage the pipe.\n\n**Who must act:**\nAnyone who owns or operates a BAe 125 Series 1000 aircraft covered by a specific service bulletin from Corporate Jets Limited (dated 7 January 1993).\n\n**What they must do:**\nFollow the repair instructions in that service bulletin exactly.\n\n**Why it matters:**\nDamaged oxygen pipes in an aircraft are a serious safety risk. This order prevents potential oxygen system failures by fixing the design flaw before it causes damage.\n\n**Deadline:**\nThe inspection and repair had to be completed before 5 March 1993.\n\n**Key point:** This directive was made mandatory by the UK aviation authority (CAA) and adopted by Australia's Civil Aviation Safety Authority to ensure the same safety standard applies here."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope matches the original, stated intent: to prevent chafing damage to the oxygen pipe assembly on identified BAe 125 Series 1000 aircraft by requiring inspection and any corrective action set out in Corporate Jets Limited Service Bulletin S.B. 35-36, to be completed before 5 March 1993 (Background; Applicability; Requirement; Compliance). There is no indication in the text that the range of affected aircraft, the required action, or the deadline differs from that stated purpose."},"complexity_factors":["Narrow applicability limited to BAe 125 Series 1000 aircraft identified in a specific Service Bulletin (Applicability).","Single mandated action: follow the Accomplishment Instructions of Corporate Jets Limited Service Bulletin S.B. 35-36 (Requirement).","Fixed, short compliance deadline creates scheduling pressure (Compliance).","Technical nature of the inspection requires qualified maintenance and access to the external Service Bulletin (Requirement).","Reference to an external regulator's classification (CAA(UK)) adds an inter-jurisdictional reference but does not add procedural complexity (Note)."],"plain_english_summary":"This directive mandates owners/operators of specified British Aerospace BAe 125 Series 1000 aircraft to carry out the inspection and any corrective action in Corporate Jets Ltd. Service Bulletin S.B. 35‑36 to prevent oxygen-pipe chafing against the nose‑wheel steering chain. Compliance (and associated costs) is required before 5 March 1993 and is enforced by the Civil Aviation Safety Authority."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-137-oxygen-system-inspection","history":"/api/acts/ad-hs-125-137-oxygen-system-inspection/history","analysis":"/api/acts/ad-hs-125-137-oxygen-system-inspection/analysis","conflicts":"/api/acts/ad-hs-125-137-oxygen-system-inspection/conflicts","importantCases":"/api/acts/ad-hs-125-137-oxygen-system-inspection/important-cases","documents":"/api/acts/ad-hs-125-137-oxygen-system-inspection/documents"}}