{"id":"F2006B03008","name":"AD/B747/107 - Oxygen System - Pilots and Co-Pilots Oxygen Hoses","slug":"ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42367,"registerId":"commonwealth-F2006B03008-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/107 - Oxygen System - Pilots and Co-Pilots Oxygen Hoses","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)  Boeing 747 Series Aeroplanes\n\n \n\n# AD/B747/107 Oxygen System - Pilots and Co-Pilots Oxygen Hoses\n\nApplicability: Model 747-400 series airplanes listed in the Requirement Document.\n\n# 4/92\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 92-02-06 Amdt 39- 8142.\n\n \n\nNote: Boeing Alert SB 747-35A2075 Revision 1 refers.\n\n \n\nCompliance: As specified in the Requirement Document with a revised effective date of 31 May 1992 for Australian registered aircraft.\n\n \n\nBackground: This Directive requires inspection, and if necessary, replacement or rerouting of the oxygen hose supplying oxygen to the Captain’s and First Officer’s oxygen mask stowage boxes.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements the technical requirements of FAA AD 92-02-06 for the 747-400 series aeroplanes listed in the Requirement Document and sets an Australian revised effective date (31 May 1992). The text provided does not indicate any expansion or narrowing of the affected work beyond that implementation or any change to the population of affected aircraft; therefore there is no evidence in this instrument that the scope has changed from the original FAA-based requirement. (Applicability; Requirement; Compliance)"},"complexity_factors":["Technical specificity is low in the AD text itself; detailed procedures are in the referenced FAA AD and Boeing Alert Service Bulletin, creating a dependence on external technical documents. (Requirement; Note)","Applicability is limited to specific 747-400 series aeroplanes listed in a separate Requirement Document, so implementers must consult that list to determine scope. (Applicability)","Compliance timing includes a revised effective date (31 May 1992) for Australian-registered aircraft, which requires scheduling and potential coordination across fleets. (Compliance)","The required work (inspection, possible replacement or rerouting of oxygen hose) is safety-critical and needs certified maintenance personnel and appropriate parts, imposing logistical and certification complexity. (Background)","The AD cross-references foreign regulator material (FAA AD) and manufacturer service information, introducing potential administrative complexity in acquiring and applying those documents. (Requirement; Note)"],"plain_english_summary":"What this instrument does (mechanically)\n\n- This Airworthiness Directive (AD) applies to certain Boeing 747-400 series aeroplanes listed in the Requirement Document. (Applicability)\n- It requires operators to carry out the inspection described in FAA AD 92-02-06 (Amendment 39-8142) and follow the FAA AD’s technical instructions; if the inspection finds a problem, the hose supplying oxygen to the Captain’s and First Officer’s mask stowage boxes must be replaced or rerouted as specified. (Requirement; Background)\n- The compliance timing for Australian-registered aeroplanes is set out in the Requirement Document and the AD establishes a revised effective date of 31 May 1992 for those aircraft. (Compliance)\n- The AD refers operators and maintainers to Boeing Alert Service Bulletin 747-35A2075 Revision 1 for related technical detail. (Note)\n\nWhy the AD exists (official purpose claim, stated in the source)\n\n- The directive’s stated function is to ensure that the oxygen hose supplying the pilots’ mask stowage boxes is inspected and, if necessary, replaced or rerouted. The Background section describes that requirement without expressing broader policy aims. (Background)\n\nOperational effects, incentives and who decides or pays\n\n- Who must act: operators of the 747-400 series aeroplanes listed in the Requirement Document are required to perform the inspection and any corrective action. This follows from the Applicability and the Requirement. (Applicability; Requirement)\n- Who decides how the corrective work is done: the AD directs compliance with the technical requirements of the referenced FAA AD and the Boeing Alert Service Bulletin; those referenced documents specify the detailed inspection, replacement, or rerouting procedures. That means the technical method and acceptance criteria are set by the referenced FAA AD/Boeing service information rather than within this short AD text itself. (Requirement; Note)\n- Who pays: the AD does not state funding arrangements; practically, operators (or their maintenance contractors) will incur the direct costs of inspection, labour and any replacement parts, because they must implement the AD to keep the aircraft airworthy. This cost implication follows from the AD’s requirement that the work be carried out. (Requirement; Compliance)\n\nCompliance burden, implementation risk and trade-offs\n\n- Compliance burden: the obligation to inspect and potentially replace or reroute an oxygen hose creates a maintenance task that requires aircraft access, certified maintenance personnel, and possibly parts inventory. The AD cross-references FAA and Boeing technical material, which operators must obtain and follow; that can add administrative and technical burden. (Requirement; Note)\n- Operational disruption and opportunity cost: aircraft will be unavailable for service while inspections and corrective work are carried out. The AD fixes an effective date for Australian-registered planes, which concentrates scheduling pressure before that date. (Compliance)\n- Dependence on external documents: because the AD implements the FAA AD’s technical requirements and refers to a Boeing Alert Service Bulletin, Australian operators depend on those external documents for precise procedures. That increases reliance on the availability and clarity of those documents. (Requirement; Note)\n- Implementation risk: the directive addresses a safety-critical oxygen supply routing. Incorrect inspection, improper replacement routing, or use of non-conforming parts could undermine the objective; the AD therefore channels implementation through the FAA AD and Boeing service instructions to reduce such risk, but the legislated text itself does not contain the technical acceptance criteria. (Requirement; Note; Background)\n\nCompetition, pricing and market effects (market-liberal prior applied)\n\n- Direct effect on private enterprise: the AD imposes a compliance cost on operators of affected 747-400 aircraft. That cost will be borne by the airline or aircraft owner and their maintenance suppliers. (Applicability; Requirement)\n- Effects on competition and prices: the AD increases maintenance demand for a particular aircraft type and for specific parts and technical expertise. If parts or qualified maintenance capacity are limited, this could temporarily raise prices for those services; the AD itself does not create or allocate subsidies or reimbursements. (Requirement; Note)\n\nConcentrated benefits, diffuse costs and capture risk\n\n- Concentrated benefits: the immediate safety benefit, if realized, accrues to the crew and passengers of affected aircraft. (Background)\n- Diffuse costs: the compliance costs are concentrated on the operators of the affected aeroplanes; the AD text does not identify offsetting funding or compensation. (Applicability; Compliance)\n- Capture risk and rent-seeking: the AD cites FAA and Boeing technical documents for method and detail; the text does not itself create procurement preferences. Any risk that particular suppliers or service providers benefit depends on how operators source the required parts and labour and is not described in the AD. (Requirement; Note)\n\nSummary statement\n\n- Mechanically, the AD requires inspection and corrective action (replacement or rerouting) for the oxygen hoses that serve the pilots’ mask stowage boxes on listed 747-400 series aeroplanes, directing compliance with the FAA AD and linking to Boeing service instructions. (Applicability; Requirement; Note; Background)\n- Practically, operators must schedule and pay for the inspections and any corrective work, follow the referenced technical materials for how the work is done, and accept the operational disruption and maintenance cost involved. (Applicability; Requirement; Compliance)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of ensuring pilot oxygen system integrity."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly used (Requirement Document refers to the FAA AD)","No nested conditional logic — simple 'inspect and fix if needed' structure","Single cross-reference to FAA AD 92-02-06 and Boeing Alert SB 747-35A2075","No exceptions or exemptions stated","Clear, direct applicability statement (Model 747-400 series only)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for **Boeing 747-400 aircraft**.\n\n**What it does:**\n- Requires airlines and aircraft operators to **inspect the oxygen hoses** that supply emergency oxygen to the Captain and First Officer (co-pilot)\n- If the inspection finds problems, the hoses must be **replaced or rerouted**\n\n**Why it matters:**\n- This addresses a safety defect where pilots' emergency oxygen supply could fail during a decompression emergency at high altitude — a potentially life-threatening situation\n- The directive references an American FAA safety order (AD 92-02-06), showing Australia adopting international safety standards\n\n**Who must comply:**\n- Operators of Australian-registered Boeing 747-400 series aircraft\n- Compliance deadline was set for **31 May 1992**\n\n**Key point:** This is not optional maintenance — it's legally binding. Operating an aircraft without completing this inspection would violate civil aviation regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses","history":"/api/acts/ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses/history","analysis":"/api/acts/ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses/analysis","conflicts":"/api/acts/ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses/conflicts","importantCases":"/api/acts/ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses/important-cases","documents":"/api/acts/ad-b747-107-oxygen-system-pilots-and-co-pilots-oxygen-hoses/documents"}}