{"id":"F2005L03953","name":"AD/DO 328/12 - Jet Booster Pump","slug":"ad-do-328-12-jet-booster-pump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39814,"registerId":"commonwealth-F2005L03953-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 328/12 | Jet Booster Pump | 1/2006 |\n| ------------ | ---------------- | ------ |\n\n| Applicability: | Dornier 328-100 aeroplanes serial number 3005 through 3093 inclusive, fitted with jet booster pumps part number (P/N) 219335-2.                                                                                                                                                                                                                    |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Remove P/N 219335-2 jet booster pumps and install improved P/N 219335-3 jet booster pumps in accordance with Dornier 328 Service Bulletin No. 328-28-211 dated 26 March 1997.Note: LBA AD 97-149 refers.                                                                                                                                           |\n| Compliance:    | Within 30 days from the effective date of this AD.                                                                                                                                                                                                                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                                                                                                 |\n| Background:    | A failure of the jet booster pump non-return flap valve would lead to a fuel pressure lower than needed to feed the engine without usage of the electrical fuel pump. To avoid CAS message “FUEL PRESS LOW” and respective corrective action by the crew especially during takeoff and landing requires modified jet booster pump to be installed. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/12","sectionType":"part","heading":"AD/DO 328/12","content":"## AD/DO 328/12","sortOrder":1},{"sectionNumber":"Jet Booster Pump","sectionType":"part","heading":"Jet Booster Pump","content":"## Jet Booster Pump","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — a targeted safety fix for a specific mechanical defect in a limited aircraft fleet. There is no evidence of scope creep; it addresses exactly the fuel pump valve failure described in the background."},"complexity_factors":["Single, specific mechanical part replacement with clear part numbers","Narrow applicability: only 89 aircraft (serials 3005–3093) with specific pump installed","Straightforward compliance: one action, one deadline, reference to single service bulletin","No conditional logic, exceptions, or alternative compliance methods","Minimal cross-referencing: only one external reference (German LBA AD 97-149) noted for background","Short document: approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's aviation regulator (CASA). It requires owners and operators of specific Dornier 328-100 aircraft to replace a faulty fuel pump part.\n\n**What it does:**\n- **Targets:** Dornier 328-100 planes (serial numbers 3005–3093) that have a specific jet booster pump installed (part number 219335-2)\n- **Requires:** Removal of the old pump and installation of an improved version (part number 219335-3), following the manufacturer's service instructions\n- **Deadline:** Within 30 days of 19 January 2006\n\n**Why it matters:**\nThe old pump has a design flaw in its non-return flap valve. If this valve fails, fuel pressure drops too low to feed the engine properly without switching on the backup electric pump. This could trigger a \"FUEL PRESS LOW\" warning during critical phases like takeoff or landing — exactly when pilots least want distractions or emergencies. The fix prevents potential engine fuel starvation and improves flight safety.\n\n**Who must comply:**\nAircraft operators, maintenance organisations, and owners of the affected Dornier 328-100 fleet in Australia."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD aligns with the original safety purpose: to eliminate a known failure mode in a specific jet booster pump by mandating installation of an improved part. It does not expand beyond that technical fix (no new affected models, no broader operational restrictions, and no additional obligations beyond the replacement and its 30‑day deadline)."},"complexity_factors":["Single, targeted mandatory action: replace P/N 219335-2 with P/N 219335-3","Applicability limited to Dornier 328-100 serial numbers 3005–3093 and only if fitted with P/N 219335-2","One compliance window: within 30 days of effective date","Relies on an external technical document: Dornier Service Bulletin No. 328-28-211 (cross-reference)","Reference to a related foreign AD (LBA AD 97-149) but no additional branching conditions","Short text with no nested exceptions or multiple conditional paths","Administrative metadata present (effective date, issuing delegate) but no complex enforcement schedule"],"plain_english_summary":"**What this instrument does**\n\n- This Airworthiness Directive (AD) requires certain Dornier 328-100 aeroplanes to have a specific model of jet booster pump removed and replaced with an improved model.  The work must follow Dornier Service Bulletin No. 328-28-211 (26 March 1997).\n\n**Who it affects**\n\n- Aircraft owners/operators of Dornier 328-100 aeroplanes with serial numbers 3005 through 3093, but only if those aeroplanes are fitted with jet booster pump part number (P/N) 219335-2.\n\n**What you must do and when**\n\n- Remove any jet booster pump with P/N 219335-2 and install the improved pump P/N 219335-3 in accordance with the referenced service bulletin.\n- The replacement must be completed within 30 days from the AD's effective date (the AD specifies the effective date as 19 January 2006).\n\n**Why the AD exists (stated reason and mechanical effect)**\n\n- The AD states that the non-return flap valve in the older jet booster pump (P/N 219335-2) can fail. If that valve fails, fuel pressure to the engine can drop below the level needed unless the electrical fuel pump is used. A failure can trigger a cockpit alert (“FUEL PRESS LOW”) and force the crew to take corrective actions during critical flight phases (takeoff and landing). The mandated pump (P/N 219335-3) is an improved part intended to prevent that failure mode.\n\n**Who pays, who decides, and what changes in behaviour**\n\n- Aircraft owners/operators pay for parts, labour and any downtime required to perform the replacement.\n- An authorised maintenance organisation or licensed mechanics must carry out the installation according to the Dornier service bulletin.\n- The regulator (the Civil Aviation Safety Authority, via its delegate issuing the AD) sets the mandatory requirement and enforcement; maintenance providers implement it.\n\n**Practical implementation details and risks**\n\n- The AD relies on a specific manufacturer service bulletin for the technical steps; operators must follow that document to meet the AD.\n- Risks and implementation frictions include availability of the replacement pumps, scheduling downtime for affected aircraft, and ensuring the work is completed by appropriately certificated personnel.\n- If parts are scarce or MRO (maintenance, repair, overhaul) capacity is limited, operators may face higher direct costs or temporary grounding of aircraft.\n\n**Regulatory cross-reference**\n\n- The AD refers to Dornier Service Bulletin No. 328-28-211 (26 March 1997) for the technical procedure and notes correspondence with LBA AD 97-149 (the German airworthiness authority’s directive), indicating international coordination on the safety fix.\n\n**Trade-offs and incentive effects (brief analysis)**\n\n- Immediate cost imposed on a defined group of operators (those with affected serial numbers and part number) in exchange for reduced risk of a fuel-pressure-related alert and associated crew actions.\n- Because the affected fleet is limited (serial numbers 3005–3093 and only if fitted with P/N 219335-2), the cost burden is concentrated on a small set of operators; benefits (fewer in-flight alerts, reduced emergency interventions) accrue to those operators and to aviation safety more broadly.\n- The directive constrains operators’ maintenance choices for the affected pumps (they must install the improved part unless an alternative approved corrective action is authorised by the regulator).\n\n(Fields cited: Applicability, Requirement, Compliance, Background, Effective date.)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-12-jet-booster-pump","history":"/api/acts/ad-do-328-12-jet-booster-pump/history","analysis":"/api/acts/ad-do-328-12-jet-booster-pump/analysis","conflicts":"/api/acts/ad-do-328-12-jet-booster-pump/conflicts","importantCases":"/api/acts/ad-do-328-12-jet-booster-pump/important-cases","documents":"/api/acts/ad-do-328-12-jet-booster-pump/documents"}}