{"id":"F2006B03453","name":"AD/BAe 146/10 - Oxygen Main Supply Cylinder Corrosion","slug":"ad-bae-146-10-oxygen-main-supply-cylinder-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43007,"registerId":"commonwealth-F2006B03453-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/10 - Oxygen Main Supply Cylinder Corrosion","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\nAD/BAe 146/10 Oxygen Main Supply Cylinder Corrosion 13/88\n\nApplicability: As detailed in the Requirement Document. Requirement: Action in accordance with BAe 146 SB 35-8.\n\nCompliance: Within three months time in service after 29 December 1988 and thereafter at intervals not exceeding 12 months until embodiment of Mod HCM 36032A.\n\n \n\nBackground:  Corrosion of the cylinder has been reported in the contact area between the cylinder and the cradle.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific corrosion issue in a specific aircraft type. It has not expanded beyond its original purpose of ensuring oxygen cylinder integrity."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined reference (the Service Bulletin SB 35-8)","Simple conditional structure: inspect by date, then repeat annually, stop when modification installed","No nested exceptions or complex cross-referencing","Single technical requirement with clear compliance timeline","Background explanation is one sentence"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for a specific aircraft type.\n\n**What it does:**\n- Requires owners and operators of **British Aerospace BAe 146 series aircraft** to inspect the main oxygen supply cylinders for corrosion\n- Specifically targets corrosion where the cylinder sits in its cradle (mounting bracket)\n\n**Who must act:**\n- Anyone operating or maintaining BAe 146 aircraft in Australia\n\n**What action is required:**\n- Follow the instructions in **BAe Service Bulletin 35-8** (a technical notice from the manufacturer)\n- First inspection must happen within **3 months of flying time** after 29 December 1988\n- Repeat inspections every **12 months** until a permanent fix (Modification HCM 36032A) is installed\n\n**Why it matters:**\nCorrosion in oxygen cylinders can weaken the metal, potentially causing cylinder failure. In an emergency, passengers and crew need reliable oxygen supply. This AD prevents that safety risk through regular checks until a permanent engineering fix is applied."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text provides no indication that the directive’s scope has been altered from its original form. It defines applicability by reference to a Requirement Document, mandates compliance with a specific service bulletin, sets the initial and recurring inspection timetable, and specifies termination upon embodiment of Mod HCM 36032A (Applicability; Requirement; Compliance). There is no material in the document showing any change in affected aircraft, required actions, or timetable compared with its stated provisions."},"complexity_factors":["Relies on external documents for technical detail (BAe 146 SB 35-8) rather than providing procedures in the directive (Requirement).","Applicability is specified by reference to a separate Requirement Document rather than listed in-line, which requires consultation of additional material (Applicability).","Repeating compliance intervals (initial within 3 months, then ≤12 months) create ongoing operational scheduling and recordkeeping obligations (Compliance).","Termination of the requirement is conditional on embodiment of a specific modification (Mod HCM 36032A), linking regulatory duty to a technical design change (Compliance).","The directive is short and narrowly targeted (single corrosion problem), reducing substantive legal complexity but increasing dependence on technical documents for full compliance."],"plain_english_summary":"This directive applies to BAe 146 series aeroplanes and makes compliance with BAe 146 Service Bulletin 35-8 mandatory to inspect and rectify reported corrosion on the oxygen main supply cylinder where it contacts its cradle.  \n\nOperators must carry out the SB actions within three months’ time in service after 29 December 1988 and then at intervals not exceeding 12 months until Mod HCM 36032A is embodied; operators bear the inspection, repair and downtime costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-10-oxygen-main-supply-cylinder-corrosion","history":"/api/acts/ad-bae-146-10-oxygen-main-supply-cylinder-corrosion/history","analysis":"/api/acts/ad-bae-146-10-oxygen-main-supply-cylinder-corrosion/analysis","conflicts":"/api/acts/ad-bae-146-10-oxygen-main-supply-cylinder-corrosion/conflicts","importantCases":"/api/acts/ad-bae-146-10-oxygen-main-supply-cylinder-corrosion/important-cases","documents":"/api/acts/ad-bae-146-10-oxygen-main-supply-cylinder-corrosion/documents"}}