{"id":"F2006B02668","name":"AD/B727/145 - Lavatory Drain System","slug":"ad-b727-145-lavatory-drain-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41984,"registerId":"commonwealth-F2006B02668-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/145 - Lavatory Drain System","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/B727/145 Lavatory Drain System 2/95\n\nApplicability: All model 727 series aircraft.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 94-23-10 Amdt 39- 9073.\n\n \n\nNote: FAA AD 94-23-10 Amdt 39-9073 supersedes FAA AD 86-05-07 Amdt 39-5250.\n\n \n\nCompliance: As specified in the Requirement Document with a revised effective date of 2 February 1995.\n\n \n\nBackground: This Directive has been raised to prevent engine damage or separation, airframe damage, and/or hazard to persons or property on the ground which could occur if “blue ice” has formed from leakage of the lavatory drain system and is subsequently dislodged from the aircraft.\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, single-issue safety directive focused specifically on lavatory drain systems in one aircraft type. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability (\"All model 727 series aircraft\")","Single cross-reference to external technical document (FAA AD 94-23-10)","No nested conditions or exceptions","Straightforward compliance deadline","Minimal legislative machinery — essentially a notice adopting external technical standards"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nIt requires owners and operators of **Boeing 727 aircraft** to inspect and fix a specific problem with the **lavatory (toilet) drain system**.\n\n**The problem:**\nIf the toilet drain leaks, the leaking fluid can freeze into \"blue ice\" (a frozen mixture of waste and chemicals) on the outside of the aircraft. If this ice breaks off during flight, it can:\n- Damage or even rip off engines\n- Damage the aircraft's body (airframe)\n- Fall and hurt people or property on the ground\n\n**What must be done:**\nAircraft operators must follow the technical instructions in a US safety order called **FAA AD 94-23-10** (which replaced an older order, FAA AD 86-05-07). This tells them exactly how to inspect and repair the drain system.\n\n**Who it affects:**\nAnyone who owns or operates a Boeing 727 in Australia.\n\n**When:**\nThe fixes must be done by **2 February 1995** (or according to the timeline in the US safety document).\n\n**Why it matters:**\nThis prevents dangerous ice chunks from falling off planes and causing serious accidents."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This CASA directive adopts and enforces the updated FAA technical requirements in FAA AD 94-23-10 (Amdt 39-9073), which the instrument notes supersedes the earlier FAA AD 86-05-07 (Note). By referencing the superseding FAA AD and setting a revised effective date of 2 February 1995, the CASA instrument updates the technical compliance obligations that apply to all Boeing 727 series aircraft (Requirement; Compliance; Note)."},"complexity_factors":["Short, single-issue directive focused on lavatory drain system \"blue ice\" risk (Background).","No technical detail in this instrument — it imports technical requirements by reference to FAA AD 94-23-10 (Requirement).","Applies to an entire aircraft model line (all 727 series) — broad scope of applicability (Applicability).","Compliance depends on an external document (FAA AD), so operators must obtain and follow that separate, potentially technical, document (Requirement; Compliance).","Contains a revised effective date, requiring attention to timing for compliance actions (Compliance)."],"plain_english_summary":"CASA requires all Boeing 727 series aeroplanes to comply with FAA Airworthiness Directive 94-23-10 (revised 2 Feb 1995), adopting its technical measures to prevent “blue ice” from lavatory drain leakage that could cause engine, airframe or ground damage.  \n\nThe rule affects 727 owners/operators, who must obtain and follow the FAA AD and bear the costs, maintenance downtime and administrative burden; CASA enforces compliance by importing the FAA’s technical requirements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-145-lavatory-drain-system","history":"/api/acts/ad-b727-145-lavatory-drain-system/history","analysis":"/api/acts/ad-b727-145-lavatory-drain-system/analysis","conflicts":"/api/acts/ad-b727-145-lavatory-drain-system/conflicts","importantCases":"/api/acts/ad-b727-145-lavatory-drain-system/important-cases","documents":"/api/acts/ad-b727-145-lavatory-drain-system/documents"}}