{"id":"F2006B02790","name":"AD/B727/86 - Passenger Oxygen Mask Tube Attachment","slug":"ad-b727-86-passenger-oxygen-mask-tube-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42132,"registerId":"commonwealth-F2006B02790-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/86 - Passenger Oxygen Mask Tube Attachment","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 727 Series Aeroplanes\n\n \n\nAD/B727/86 Passenger Oxygen Mask Tube Attachment 4/80\n\nApplicability: All models with “Carry-all” interior passenger service units. Document: 1. Boeing SB No. 727-35-A18; or\n\n2. FAA AD 79-23-02.\n\n \n\nCompliance: Within 2000 hours time in service after 30 April 1980.\n\n \n\nBackground: Advice from overseas indicates that modification of the passenger oxygen manifold orifice fittings is necessary to prevent passenger oxygen supply tubes from inadvertently disconnecting.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the text provided, the instrument’s scope aligns with its stated purpose: it targets Boeing 727 aircraft fitted with 'Carry-all' passenger service units and mandates a specific modification within a set time window to prevent oxygen tube disconnection (Applicability; Compliance; Background). The text contains no indication that the scope was altered from its original stated intent."},"complexity_factors":["Narrow technical scope limited to Boeing 727 models with 'Carry-all' passenger service units (Applicability)","Single clear mandated action (modify manifold orifice fittings) reduces procedural complexity (Background)","Fixed compliance deadline expressed in flight hours (2000 hours after 30 April 1980) requires operational scheduling (Compliance)","Reference to external technical documents (Boeing SB No. 727-35-A18; FAA AD 79-23-02) means operators must obtain and follow separate detailed instructions (Applicability)","Limited statutory text leaves technical details to the referenced documents, which can add compliance complexity in practice (Applicability; Background)"],"plain_english_summary":"This AD mandates a retrofit to the passenger oxygen manifold orifice fittings on Boeing 727s fitted with “Carry‑all” passenger service units to prevent inadvertent disconnection of oxygen supply tubes. Affected owners/operators must arrange and fund the modification per Boeing SB 727‑35‑A18 or FAA AD 79‑23‑02 within 2,000 flight hours of 30 April 1980; it’s a safety measure to reduce in‑flight oxygen failures."},"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 mandating an oxygen system modification."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implicitly referenced ('Carry-all' interior)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple conditional structure: applicability → requirement → deadline","Single compliance pathway with two alternative technical documents","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety fix ordered by Australia's aviation regulator (CASA) for specific Boeing 727 aircraft.\n\n**What it does:** Requires owners/operators of Boeing 727s with a particular interior setup (\"Carry-all\" passenger service units) to modify the passenger oxygen system. The fix prevents oxygen supply tubes from accidentally disconnecting during an emergency — which could leave passengers without oxygen when they need it most.\n\n**Who must comply:** Anyone operating Boeing 727 aircraft with the affected interior configuration.\n\n**How to comply:** Follow either Boeing Service Bulletin 727-35-A18 or the equivalent US FAA directive (AD 79-23-02). The work must be done within 2,000 flight hours after 30 April 1980.\n\n**Why it matters:** This addresses a safety defect discovered overseas where oxygen tubes could fall off their fittings. In a decompression emergency at altitude, passengers rely on these masks to breathe. A disconnected tube means no oxygen — potentially fatal."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-86-passenger-oxygen-mask-tube-attachment","history":"/api/acts/ad-b727-86-passenger-oxygen-mask-tube-attachment/history","analysis":"/api/acts/ad-b727-86-passenger-oxygen-mask-tube-attachment/analysis","conflicts":"/api/acts/ad-b727-86-passenger-oxygen-mask-tube-attachment/conflicts","importantCases":"/api/acts/ad-b727-86-passenger-oxygen-mask-tube-attachment/important-cases","documents":"/api/acts/ad-b727-86-passenger-oxygen-mask-tube-attachment/documents"}}