{"id":"F2006L01687","name":"AD/DO 328/63 - Wing - Rib 21 Fuel Leaks","slug":"ad-do-328-63-wing-rib-21-fuel-leaks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59442,"registerId":"commonwealth-F2006L01687-current","compilationNumber":null,"startDate":"2026-04-02","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 328/63 | Wing - Rib 21 Fuel Leaks | 7/2006 |\n| ------------ | ------------------------ | ------ |\n\n| Applicability: | Dornier 328-100 aeroplanes.                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Unless previously accomplished, carry out a visual inspection of L/H and R/H outboard wing Rib 21 for fuel leakage in accordance with Dornier 328 Alert Service Bulletin No. ASB-328-57-020 dated 28 October 1997 or later LBA approved revision.2. Repeat the visual inspection detailed in Requirement 1 of this AD.Note: LBA AD 1998-020 refers. |\n| Compliance:    | 1. Within 30 days after the effective date of this AD.2. At each “5A check” or at intervals not to exceed 6 months, whichever occurs first.                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 6 July 2006.                                                                                                                                                                                                                                                                                         |\n| Background:    | Fuel leakage has occurred at Rib 21 on the L/H wing. This AD requires a repetitive inspective for fuel leaks.                                                                                                                                                                                                                                          |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n24 May 2006","sortOrder":0},{"sectionNumber":"AD/DO 328/63","sectionType":"part","heading":"AD/DO 328/63","content":"## AD/DO 328/63","sortOrder":1},{"sectionNumber":"Wing - Rib 21 Fuel Leaks","sectionType":"part","heading":"Wing - Rib 21 Fuel Leaks","content":"## Wing - Rib 21 Fuel Leaks","sortOrder":2},{"sectionNumber":"7/2006","sectionType":"part","heading":"7/2006","content":"## 7/2006","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 narrowly focused on requiring inspections for fuel leakage at Rib 21 after an incident was observed. It directly implements that original safety objective and does not add unrelated obligations or broaden applicability beyond Dornier 328-100 aeroplanes. The requirement is procedural (inspections per a named Service Bulletin) and repetitive, but does not expand the AD’s scope beyond detecting and addressing the identified leakage risk."},"complexity_factors":["Very short document: single safety issue (Rib 21 fuel leakage).","One prescribed action: visual inspection per named Service Bulletin (ASB-328-57-020).","One repeating requirement with simple timing rules: initial within 30 days; repeat at each 5A check or every 6 months.","Single aircraft type applicability: Dornier 328-100 only.","Reference to an external document and regulator: ASB and LBA-approved revisions increase administrative tracking but are a single cross-reference.","No nested exceptions, no multiple conditional branches, no technical definitions or long interpretation section."],"plain_english_summary":"**What this directive does (mechanical change)**\n\n- Applies to: Dornier 328-100 aeroplanes.\n- Requires operators to carry out a visual inspection of Rib 21 on both the left-hand (L/H) and right-hand (R/H) outboard wing for fuel leakage in accordance with Dornier 328 Alert Service Bulletin No. ASB-328-57-020 dated 28 October 1997 (or a later revision approved by the German Federal Aviation Office, LBA). (See Requirement 1.)\n- Requires repeating that visual inspection on an ongoing basis. The repeat interval is at each “5A check” or at intervals not to exceed 6 months, whichever occurs first. (See Requirement 2 and Compliance 2.)\n- Requires that the first inspection be done within 30 days after the directive’s effective date. (See Compliance 1.)\n- Effective date recorded as 6 July 2006; issued by the Civil Aviation Safety Authority delegate. A German LBA AD (1998-020) is referenced in the directive.\n\n**Who this affects**\n\n- Aircraft operators, maintenance organisations and maintenance personnel responsible for Dornier 328-100 aeroplanes. The directive specifies who must act (the operator/maintenance provider), what they must do (visual inspection following the named Service Bulletin), and when (initially within 30 days, then at each 5A check or every 6 months).\n\n**Why it matters (stated purpose and practical effect)**\n\n- Stated purpose: fuel leakage has been observed at Rib 21 on the left wing; the inspections are intended to detect and thereby prevent fuel leaks. (Background and Requirement.)\n\n**Practical mechanics, incentives and trade-offs**\n\n- Who pays: the operator bears the direct cost of inspections, any follow-up repairs, and any aircraft downtime while inspections/repairs occur.\n- Who decides/controls scope of acceptable work: the directive makes adherence to a named manufacturer Service Bulletin mandatory, but allows later LBA-approved revisions of that Bulletin; this ties the required inspection method to the manufacturer’s procedure and to the LBA’s approval process.\n- Behavioural change required: maintenance organisations must add a recurring visual inspection of Rib 21 to the aircraft’s maintenance schedule and record compliance; operators may elect to perform more invasive repairs or replacements to eliminate the need for recurrent inspections, but the AD itself mandates inspection unless the inspector or operator obtains an approved alternative method of compliance.\n- Costs and opportunity cost: the recurring inspection frequency (every 5A check or every 6 months) creates an ongoing maintenance burden and potential aircraft downtime. If leaks are found, repair costs and possible parts replacement will be additional. These are concentrated costs on operators of the small affected fleet (Dornier 328-100), while the safety benefit (reduced risk of fuel leakage) is diffuse across passengers, crew and the public.\n- Implementation risk and effectiveness: the mandated detection method is a visual inspection. Visual checks are inexpensive and simple to implement but can miss small or intermittent leaks; if visual inspection is insufficient, a leak could persist undetected between inspections. The Service Bulletin requirement means the detail of how to inspect is specified externally and may require training or procedures change.\n- Regulatory interaction and administrative burden: the AD references a specific manufacturer Service Bulletin and requires LBA approval for later revisions. That creates a dependency on LBA approvals for future permitted procedures and may require operators to track revisions and approvals.\n\n**Concrete provisions cited**\n\n- Requirement 1: initial visual inspection following ASB-328-57-020 (or later LBA approved revision).\n- Requirement 2 / Compliance 2: repeat at each 5A check or at intervals not to exceed 6 months.\n- Compliance 1: initial inspection within 30 days of the AD’s effective date.\n\n**Net practical effect**\n\nOperators of Dornier 328-100 aeroplanes must inspect Rib 21 for fuel leaks soon (within 30 days) and then repeatedly at a defined maintenance cadence. The directive formalises a manufacturer-prescribed inspection procedure and imposes recurring maintenance costs and record-keeping obligations on operators; its stated benefit is reduced risk from fuel leakage at that wing location."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific technical defect in a specific aircraft type. The scope remains tightly focused on the original safety issue (Rib 21 fuel leaks) with no evidence of scope creep."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced ('5A check' — a maintenance interval)","Single, clear compliance pathway with only 2 requirements","No nested exceptions or conditional logic","Minimal cross-referencing (only to one Service Bulletin and one German aviation authority document — LBA AD 1998-020)"],"plain_english_summary":"This AD requires owners and operators of Dornier 328‑100 aeroplanes to inspect Rib 21 on both wings for fuel leaks per Dornier Alert Service Bulletin ASB‑328‑57‑020 and to repeat that inspection at every 5A check or every six months.\n\nIt affects anyone operating or maintaining these aircraft in Australia and addresses observed fuel leakage to reduce fire and flight‑safety risk through ongoing monitoring."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-63-wing-rib-21-fuel-leaks","history":"/api/acts/ad-do-328-63-wing-rib-21-fuel-leaks/history","analysis":"/api/acts/ad-do-328-63-wing-rib-21-fuel-leaks/analysis","conflicts":"/api/acts/ad-do-328-63-wing-rib-21-fuel-leaks/conflicts","importantCases":"/api/acts/ad-do-328-63-wing-rib-21-fuel-leaks/important-cases","documents":"/api/acts/ad-do-328-63-wing-rib-21-fuel-leaks/documents"}}