{"id":"F2005L03944","name":"AD/DO 328/18 - Aft Avionics Cooling Fan","slug":"ad-do-328-18-aft-avionics-cooling-fan","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39795,"registerId":"commonwealth-F2005L03944-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 328/18 | Aft Avionics Cooling Fan | 1/2006 |\n| ------------ | ------------------------ | ------ |\n\n| Applicability: | Model 328-100 aeroplanes with serial numbers 3005 to 3095 inclusive.                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | If not previously accomplished, modify the aft avionics cooling fan in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-21-215, dated 5 May 1997. |\n|                | Note: LBA AD 97-158 refers.                                                                                                                                                          |\n| Compliance:    | Within 30 days after the effective date of this Directive.                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                   |\n| Background:    | Several failures of the aft avionics cooling fan have been reported. This Directive requires the modification of the fan to improve cooling.                                         |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/18","sectionType":"part","heading":"AD/DO 328/18","content":"## AD/DO 328/18","sortOrder":1},{"sectionNumber":"Aft Avionics Cooling Fan","sectionType":"part","heading":"Aft Avionics Cooling Fan","content":"## Aft Avionics Cooling Fan","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD is consistent with the original, narrowly-targeted safety purpose: addressing reported aft avionics cooling fan failures for a specific block of Dornier 328-100 aeroplanes. It does not broaden the subject matter or add unrelated obligations; it mandates a single modification as the remedial measure identified by the manufacturer and referenced foreign authority."},"complexity_factors":["Single, narrow applicability: Model 328-100, serial numbers 3005–3095 (one contiguous serial block)","Single required action: modify aft avionics cooling fan per one service bulletin (SB-328-21-215, dated 5 May 1997)","Single compliance deadline: within 30 days of the effective date","References one external document (Dornier Service Bulletin) and one foreign AD (LBA AD 97-158)","No multiple exceptions, no phased compliance, no alternative methods specified in the text (would require further approval)"],"plain_english_summary":"**What this directive does (mechanical change)\n\n- This Airworthiness Directive (AD) requires operators of certain Dornier 328-100 aeroplanes to modify the aft avionics cooling fan.\n- The modification must be done exactly as set out in the Accomplishment Instructions of Dornier Service Bulletin SB-328-21-215 (dated 5 May 1997).\n- Affected aeroplanes: Model 328-100 with serial numbers 3005 to 3095 inclusive.\n- Timing: the work must be completed within 30 days after the AD’s effective date (the AD becomes effective 19 January 2006).\n\nWhy the regulator issued it (official rationale)\n\n- The AD says several failures of the aft avionics cooling fan were reported. The stated purpose is to improve cooling by modifying the fan, thereby addressing those failures.\n\nWho this affects, who decides, and who pays\n\n- Who is affected: the registered operators/owners of the listed Dornier 328-100 aeroplanes (S/N 3005–3095). Maintenance organisations that perform the modification will also be involved.\n- Who decides: the Civil Aviation Safety Authority (CASA) issued the AD; compliance decisions and timing are the operator’s responsibility, subject to the AD’s mandatory deadline.\n- Who pays: the aircraft operators pay for the parts, labour and downtime required to perform the modification (or their maintenance provider if under contract).\n\nHow it changes behaviour and commercial effects\n\n- Operators must schedule and carry out the specified modification within 30 days or keep the aircraft out of service for operations requiring compliance with airworthiness directives.\n- Maintenance organisations and Dornier (or approved suppliers) receive work and parts revenue from performing the modification.\n- The directive narrows technical choice: operators must follow the specified service bulletin instructions rather than using alternative repairs unless an approved equivalent method is authorised by the regulator.\n\nImplementation, costs, and risks\n\n- Direct costs: parts, labour, and aircraft downtime for each affected aeroplane.\n- Operational risk: potential short-term capacity impacts if multiple affected aircraft must be grounded or taken out of service within the 30-day window.\n- Implementation risk: availability of parts or qualified personnel to perform SB-328-21-215 could delay compliance and increase costs.\n- Compliance burden: administratively simple (single required action and a 30-day deadline) but practically burdensome if an operator has limited access to maintenance slots.\n\nCross-reference and provenance\n\n- The AD references Dornier Service Bulletin SB-328-21-215 (5 May 1997) as the required work instruction and notes related Luftfahrt-Bundesamt (LBA) AD 97-158.\n\nNet effect in plain terms\n\n- The directive imposes a one-time mandatory modification on a defined fleet segment to reduce the risk of avionics cooling fan failures. Operators bear the cost and must act quickly (30 days); maintenance providers supply the work and parts. The stated safety benefit is improved cooling and reduced fan failures.\n"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on a known mechanical failure. It has not expanded beyond its original purpose of mandating a specific fan modification."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only one substantive requirement with clear cross-reference to external technical document (Dornier Service Bulletin SB-328-21-215)","Simple applicability criteria (specific serial number range)","Single compliance deadline with no conditional exceptions or alternative methods","No defined terms section or interpretive provisions","Minimal cross-referencing (only one reference to German aviation authority document LBA AD 97-158)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's aviation regulator (CASA). It applies to specific **Dornier 328-100 aircraft** (serial numbers 3005 through 3095).\n\n**What it requires:**\n- Aircraft operators must **modify the rear electronics cooling fan** if they haven't already done so.\n- The modification must follow specific instructions in a **Dornier Service Bulletin** (technical repair notice) dated May 1997.\n\n**Why it matters:**\n- The cooling fan has been **failing repeatedly**, which could cause electronics to overheat.\n- This creates a **safety risk** for flight operations.\n\n**When it had to be done:**\n- Within **30 days** of 19 January 2006 (so by mid-February 2006).\n\n**Who issued it:**\n- A **delegate of CASA** (the Civil Aviation Safety Authority) — someone authorised to act on CASA's behalf."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-18-aft-avionics-cooling-fan","history":"/api/acts/ad-do-328-18-aft-avionics-cooling-fan/history","analysis":"/api/acts/ad-do-328-18-aft-avionics-cooling-fan/analysis","conflicts":"/api/acts/ad-do-328-18-aft-avionics-cooling-fan/conflicts","importantCases":"/api/acts/ad-do-328-18-aft-avionics-cooling-fan/important-cases","documents":"/api/acts/ad-do-328-18-aft-avionics-cooling-fan/documents"}}