{"id":"F2005L03695","name":"AD/DO 328/4 - De-icing/Anti-icing Fluids","slug":"ad-do-328-4-de-icing-anti-icing-fluids","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39359,"registerId":"commonwealth-F2005L03695-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Dornier 328 Series Aeroplanes","sectionType":"division","heading":"Dornier 328 Series Aeroplanes","content":"### Dornier 328 Series Aeroplanes\n\n| AD/DO 328/4 | De-icing/Anti-icing Fluids | 1/2006 TX |\n| ----------- | -------------------------- | --------- |\n\n| Applicability: | Dornier 328-100 series aeroplanes.                                                                                                                                                                                                                                                                                                                             |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless previously accomplished insert Dornier 328 All Operators Telefax No.AOT-328-00-022 Revision 1 dated 7 November 2003 or later LBA approved revision into the Aeroplane Flight Manual and advise the Flight Crew to operate the aeroplane accordingly until further notice.Note: LBA AD D-2004-007 EASA Approval No. 2004-48 dated 8 January 2004 refers. |\n| Compliance:    | Before further flight.                                                                                                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 28 November 2005.                                                                                                                                                                                                                                                                                            |\n| Background:    | Testing of undiluted de/anti-icing fluids (Type II and IV fluids, based on propylene glycol) has shown that some of the fluid remains on wing, aileron and flap surfaces during the takeoff run, rotation and during initial climb out. This causes a temporary decrease in lift, increase in drag and can lead to reduced controllability of the aeroplane.   |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n22 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/4","sectionType":"part","heading":"AD/DO 328/4","content":"## AD/DO 328/4","sortOrder":1},{"sectionNumber":"De-icing/Anti-icing Fluids","sectionType":"part","heading":"De-icing/Anti-icing Fluids","content":"## De-icing/Anti-icing Fluids","sortOrder":2},{"sectionNumber":"1/2006 TX","sectionType":"part","heading":"1/2006 TX","content":"## 1/2006 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD implements a targeted operational measure to reduce a specific aerodynamic risk associated with certain de/anti‑icing fluids on Dornier 328‑100 aeroplanes. It does not broaden regulatory scope beyond that original safety purpose: the action is limited to insertion of a specified bulletin into the AFM and advising flight crew, with immediate compliance. There is no expansion into new aircraft types, no added certification or hardware modification obligations, and no new regulatory authorities or fee regimes introduced."},"complexity_factors":["Short, single‑action directive: one mandatory procedural insertion into the AFM and a crew advisory","Immediate compliance requirement: \"Before further flight\" (no phased or conditional deadlines)","Dependency on an external operational document (AOT‑328‑00‑022 Rev 1 or later LBA‑approved revision)","Reference to a related foreign AD/approval (LBA AD D‑2004‑007 / EASA Approval No. 2004‑48) creating an external cross‑reference","No multiple exceptions, no complex definitions, no cascading or nested conditions"],"plain_english_summary":"This AD requires operators of Dornier 328‑100 aeroplanes to insert a specific Dornier Telefax bulletin (or a later LBA‑approved revision) into the AFM and brief flight crews to follow its procedures until further notice, with compliance required before further flight. It targets operators, pilots and airworthiness staff to mitigate a tested safety risk: undiluted Type II/IV de/anti‑icing fluids can remain on wing surfaces and temporarily reduce lift and controllability during takeoff/initial climb."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific technical issue with de-icing fluids on a specific aircraft type. The scope remains precisely limited to the identified safety risk and mandated corrective action."},"complexity_factors":["Single, unambiguous requirement with clear compliance deadline ('before further flight')","Only one defined technical reference (the Dornier AOT document)","No conditional logic, exceptions, or nested provisions","Extremely short document (approximately 150 words of substantive content)","Single applicability criterion (Dornier 328-100 series)","Background explanation is straightforward and technical but not legally complex"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **Dornier 328-100 aircraft**.\n\n**What it does:**\nThe directive requires airlines and aircraft operators to immediately update their flight manuals with specific safety instructions about de-icing and anti-icing fluids. Flight crews must be told to follow these new procedures \"until further notice.\"\n\n**Why it matters:**\nTesting found that undiluted Type II and IV de-icing fluids (the thick, gel-like fluids used in cold weather) don't fully run off the wings during takeoff. This leftover fluid temporarily **reduces lift, increases drag, and can make the aircraft harder to control** — a serious safety risk during the most critical phase of flight.\n\n**Who must act:**\n- Operators of Dornier 328-100 series aeroplanes\n- Must comply **before the aircraft flies again** (no grace period)\n\n**The fix:**\nInsert a specific technical bulletin (Dornier AOT-328-00-022 Revision 1) into the flight manual and brief all pilots on the new operating procedures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-4-de-icing-anti-icing-fluids","history":"/api/acts/ad-do-328-4-de-icing-anti-icing-fluids/history","analysis":"/api/acts/ad-do-328-4-de-icing-anti-icing-fluids/analysis","conflicts":"/api/acts/ad-do-328-4-de-icing-anti-icing-fluids/conflicts","importantCases":"/api/acts/ad-do-328-4-de-icing-anti-icing-fluids/important-cases","documents":"/api/acts/ad-do-328-4-de-icing-anti-icing-fluids/documents"}}