{"id":"F2005L03937","name":"AD/DO 328/24 - Ground Cooling Fan","slug":"ad-do-328-24-ground-cooling-fan","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39778,"registerId":"commonwealth-F2005L03937-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 328/24 | Ground Cooling Fan | 1/2006 |\n| ------------ | ------------------ | ------ |\n\n| Applicability: | Dornier 328-100 aeroplanes serial numbers: 3005 to 3095 inclusive.                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless previously accomplished, install a modified check valve in accordance with Dornier 328 Service Bulletin No. 328-21-227 dated 16 July 1997 or later LBA approved revision.Note: LBA AD 97-243 refers.                                                                                                                                                                                                             |\n| Compliance:    | Within 30 days after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | On aircraft with engines without Pratt & Whitney SB P&WC-SB-21453 incorporated the heat exchanger can suffer oil contamination. Oil contaminated heat exchangers together with an unserviceable ground cooling fan can cause an overheat condition, which under worst conditions can lead to smoke in the cabin and the cockpit.This AD requires the replacement of the valve and varies the installation of the valve. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/24","sectionType":"part","heading":"AD/DO 328/24","content":"## AD/DO 328/24","sortOrder":1},{"sectionNumber":"Ground Cooling Fan","sectionType":"part","heading":"Ground Cooling Fan","content":"## Ground Cooling Fan","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD implements a targeted safety corrective action for a specific subset of Dornier 328-100 aeroplanes and references an existing manufacturer service bulletin and LBA AD. It does not broaden the original safety objective: it requires the valve modification described in the Dornier service bulletin to address oil contamination/overheat risk. There is no indication in the text that the AD expanded beyond that original remedial purpose or added unrelated obligations."},"complexity_factors":["Short, single-action AD: one mandatory modification (install modified check valve)","Narrow applicability: applies only to Dornier 328-100 serial numbers 3005–3095","Single cross-reference to one Dornier Service Bulletin (328-21-227 dated 16 July 1997) or later LBA-approved revision","One compliance timeframe: 30 days","One technical conditional note: relevance tied to whether Pratt & Whitney SB P&WC‑SB‑21453 has been incorporated","References another regulator's AD (LBA AD 97-243) but no deep nested exceptions or multiple compliance options"],"plain_english_summary":"This AD mandates that owners/operators of Dornier 328‑100 aeroplanes (serials 3005–3095) install a modified check valve per Dornier SB 328‑21‑227 (or later LBA‑approved revision) within 30 days. It addresses a safety risk where oil‑contaminated heat exchangers plus a failed ground cooling fan can cause overheating and smoke. Compliance is compulsory, costs and downtime fall to the aircraft owner/operator, and acceptable SB revisions require LBA approval."},"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 discrete, targeted safety directive addressing a specific mechanical defect in a limited fleet of aircraft. It has not expanded beyond its original purpose of mandating a valve modification to prevent overheating risks."},"complexity_factors":["Very short document (under 300 words)","Single, unambiguous requirement with clear technical reference (Dornier Service Bulletin 328-21-227)","Simple applicability criteria (specific serial number range only)","Straightforward compliance deadline (30 days from effective date)","No defined terms section, no cross-references to other legislation beyond a single note referencing German aviation authority (LBA AD 97-243)","No conditional logic, exceptions, or nested provisions"],"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 3005–3095).\n\n**What it requires:**\nOwners or operators of these planes must **install a modified check valve** in the ground cooling fan system. This must be done following specific technical instructions from the manufacturer (Dornier Service Bulletin 328-21-227).\n\n**Why it matters:**\nWithout this fix, there's a safety risk. On certain engine configurations, oil can contaminate the heat exchanger. If the ground cooling fan also fails, this can cause dangerous overheating — potentially leading to **smoke in the cockpit and cabin**. The modified valve prevents this hazardous chain of events.\n\n**When it had to be done:**\nWithin 30 days of 19 January 2006 (so by mid-February 2006).\n\n**Who's responsible:**\nThe aircraft operator must ensure compliance. CASA delegates (like James Coyne, who signed this) have authority to issue these binding safety mandates."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-24-ground-cooling-fan","history":"/api/acts/ad-do-328-24-ground-cooling-fan/history","analysis":"/api/acts/ad-do-328-24-ground-cooling-fan/analysis","conflicts":"/api/acts/ad-do-328-24-ground-cooling-fan/conflicts","importantCases":"/api/acts/ad-do-328-24-ground-cooling-fan/important-cases","documents":"/api/acts/ad-do-328-24-ground-cooling-fan/documents"}}