{"id":"F2006L00420","name":"AD/DO 328/53 - Drain Hole in the Outer Wing","slug":"ad-do-328-53-drain-hole-in-the-outer-wing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117087,"registerId":"commonwealth-F2006L00420-current","compilationNumber":null,"startDate":"2026-04-03","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 328/53 | Drain Hole in the Outer Wing | 3/2006 |\n| ------------ | ---------------------------- | ------ |\n\n| Applicability: | Model 328-100 aircraft, serial numbers 3005 through 3098; except serial number 3089.                |\n| -------------- | --------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with LBA AD 1998-218.Note: Dornier 328 Service Bulletin No. 328-57-255 refers. |\n| Compliance:    | Before 31 March 2006, unless already accomplished.                                                  |\n|                | This Airworthiness Directive becomes effective on 16 March 2006.                                    |\n| Background:    | In the case of fuel leakage in the outer wing area, any fuel accumulation would not be detected.    |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n31 January 2006","sortOrder":0},{"sectionNumber":"AD/DO 328/53","sectionType":"part","heading":"AD/DO 328/53","content":"## AD/DO 328/53","sortOrder":1},{"sectionNumber":"Drain Hole in the Outer Wing","sectionType":"part","heading":"Drain Hole in the Outer Wing","content":"## Drain Hole in the Outer Wing","sortOrder":2},{"sectionNumber":"3/2006","sectionType":"part","heading":"3/2006","content":"## 3/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness concern. It has not expanded beyond its original purpose of mandating a drain hole installation to detect fuel leaks."},"complexity_factors":["Single, specific technical requirement (install drain hole)","Narrow applicability (one aircraft model, specific serial number range with one exception)","No defined terms section","No conditional logic or nested exceptions","Cross-reference to only one external document (German LBA AD 1998-218)","Simple compliance deadline structure","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft.\n\n**What it does:**\nOrders owners and operators of specific Dornier 328-100 aeroplanes to install a drain hole in the outer wing. This allows any leaking fuel to escape and be noticed, rather than pooling undetected in the wing structure.\n\n**Who it affects:**\n- Owners and operators of Dornier 328-100 aircraft with serial numbers 3005 through 3098 (except serial number 3089)\n- This covers approximately 93 aircraft\n\n**Why it matters:**\nWithout this drain hole, fuel leaks in the outer wing could go unnoticed. Accumulated fuel creates fire and explosion risks. The directive addresses a hidden hazard that could compromise flight safety.\n\n**What must happen:**\n- Aircraft must be modified before **31 March 2006** (unless already done)\n- The work must follow German aviation authority instructions (LBA AD 1998-218)\n- Dornier Service Bulletin 328-57-255 provides technical guidance\n\n**Key point:** This is a **retroactive safety fix** — it applies to aircraft already in service, not just new ones."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No change in scope is indicated by the instrument itself. It implements corrective action specified in LBA AD 1998-218 for the listed serial-numbered aircraft to mitigate undetected fuel accumulation in the outer wing; applicability, requirement and compliance timing are set out in the AD (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability to a specific fleet subset (Model 328-100, serials 3005–3098, except 3089) (Applicability)","Mandates action by reference to another authority document (LBA AD 1998-218) and a manufacturer service bulletin, creating dependency on external technical detail (Requirement; Note)","Fixed compliance deadline and effective date require scheduling and potential operational downtime (Compliance)","Technical scope is limited (drain in outer wing) but exact tasks/costs are defined only in the referenced documents, so operators must obtain and follow those documents (Requirement; Note)","Exception for one serial number increases administrative checking burden (Applicability)","Safety rationale is narrowly focused on undetected fuel accumulation, so assessment and verification steps are likely required (Background)"],"plain_english_summary":"Requires operators of specified Dornier 328-100 aircraft (serials 3005–3098, except 3089) to carry out the corrective work set out in LBA AD 1998-218 (see Dornier Service Bulletin 328-57-255) to provide/check a drain in the outer wing. Compliance is mandatory by 31 March 2006. Owners/operators pay for and schedule the work; it addresses the risk that fuel leakage in the outer wing may go undetected."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-53-drain-hole-in-the-outer-wing","history":"/api/acts/ad-do-328-53-drain-hole-in-the-outer-wing/history","analysis":"/api/acts/ad-do-328-53-drain-hole-in-the-outer-wing/analysis","conflicts":"/api/acts/ad-do-328-53-drain-hole-in-the-outer-wing/conflicts","importantCases":"/api/acts/ad-do-328-53-drain-hole-in-the-outer-wing/important-cases","documents":"/api/acts/ad-do-328-53-drain-hole-in-the-outer-wing/documents"}}