{"id":"F2006L01333","name":"AD/DO 328/61 - Hydraulics Leakage and Functional Checks","slug":"ad-do-328-61-hydraulics-leakage-and-functional-checks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58840,"registerId":"commonwealth-F2006L01333-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 328/61 | Hydraulics Leakage and Functional Checks | 6/2006 |\n| ------------ | ---------------------------------------- | ------ |\n\n| Applicability: | Dornier 328-100 aeroplanes.                                                                                                                                                                                                                                                                                                                                                                               |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform the major internal leakage test, the bypass valve of the return filter element test and the shut-off valve with bypass test according to section E, F(3) and F(4) of AMM TR 29-087 and TR 29-088 as applicable.Note: LBA AD 1997-189/2 dated 18 June 1998 refers.                                                                                                                                 |\n| Compliance:    | For aircraft that have previously completed a C-Check inspection but have not complied with the above mentioned AMM TRs this AD must be performed not later than at the next A-Check after the effective date of this AD.For aircraft that have complied with the above mentioned AMM TRs or aircraft that have not yet performed a first C-Check no action is required until the next scheduled C-Check. |\n|                | This Airworthiness Directive becomes effective on 8 June 2006.                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | This AD is in response to possible high internal leakage rates within the components of the ground spoiler hydraulic supply system and build-up of pressure in the bypass valve return line.                                                                                                                                                                                                              |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n28 April 2006","sortOrder":0},{"sectionNumber":"AD/DO 328/61","sectionType":"part","heading":"AD/DO 328/61","content":"## AD/DO 328/61","sortOrder":1},{"sectionNumber":"Hydraulics Leakage and Functional Checks","sectionType":"part","heading":"Hydraulics Leakage and Functional Checks","content":"## Hydraulics Leakage and Functional Checks","sortOrder":2},{"sectionNumber":"6/2006","sectionType":"part","heading":"6/2006","content":"## 6/2006","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":3,"scope_assessment":{"changed":false,"description":"The instrument, as written, targets Dornier 328‑100 aeroplanes and prescribes specified hydraulic leakage and functional tests tied to AMM TR 29‑087 and TR 29‑088 with deadlines linked to existing C‑Check/A‑Check scheduling. The text shows no indication that its substantive scope was altered from its stated purpose; it also references LBA AD 1997‑189/2 and sets an effective date (8 June 2006)."},"complexity_factors":["Limited technical scope: applies only to Dornier 328‑100 aeroplanes and specific hydraulic components (ground‑spoiler supply) — reduces broad regulatory complexity.","Cross‑references to manufacturer's AMM TR 29‑087 and TR 29‑088 (sections E, F(3), F(4)) require maintenance organisations to interpret and follow those technical procedures.","Conditional compliance timing: different deadlines depending on whether a prior C‑Check has been completed, linking enforcement to maintenance schedules (C‑Check vs A‑Check).","Reference to an external LBA AD (1997‑189/2) introduces international/regulatory interplay that may require checking additional documents.","Operational burden falls on aircraft operators and authorised maintenance organisations to schedule and fund the tests; CASA (delegate) enforces the AD.","Relatively short compliance window for aircraft that missed the tests at C‑Check (must be done by next A‑Check), creating scheduling pressure for affected operators."],"plain_english_summary":"Requires operators of Dornier 328‑100 aeroplanes to carry out specific hydraulic leakage and functional tests (major internal leakage, return‑filter bypass valve, and shut‑off valve with bypass) per AMM TR 29‑087 and TR 29‑088. If an aircraft has already completed a C‑Check without these tests they must be done by the next A‑Check; otherwise they may be deferred until the next scheduled C‑Check. The directive responds to possible high internal leakage and pressure build‑up in the ground‑spoiler hydraulic supply system; operators bear the maintenance cost and authorised maintenance organisations perform the work under CASA oversight."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific hydraulic safety issue in a single aircraft type. The compliance structure (different deadlines based on prior maintenance status) is a standard risk-management approach in aviation safety directives and does not represent scope creep."},"complexity_factors":["Short, single-purpose directive with one clear applicability (one aircraft model)","Only 3 specific technical tests required, referenced to external maintenance manuals rather than spelled out in the text","Simple conditional compliance structure with only two scenarios (post-C-Check vs. pre-C-Check/compliant aircraft)","No defined terms section — relies on standard aviation terminology (A-Check, C-Check, AMM TR)","Single cross-reference to German aviation authority (LBA AD 1997-189/2) for background context only","No nested exceptions or complex temporal calculations"],"plain_english_summary":"This AD requires operators of Dornier 328‑100 aircraft to carry out specified hydraulic tests on the ground spoiler system at the next appropriate scheduled maintenance (A‑ or C‑Check as directed).  \n\nIt affects airlines and maintenance teams and targets dangerous internal leakage and pressure buildup in ground‑spoiler hydraulics — a safety risk that could impair spoiler function during landing and ground handling."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-61-hydraulics-leakage-and-functional-checks","history":"/api/acts/ad-do-328-61-hydraulics-leakage-and-functional-checks/history","analysis":"/api/acts/ad-do-328-61-hydraulics-leakage-and-functional-checks/analysis","conflicts":"/api/acts/ad-do-328-61-hydraulics-leakage-and-functional-checks/conflicts","importantCases":"/api/acts/ad-do-328-61-hydraulics-leakage-and-functional-checks/important-cases","documents":"/api/acts/ad-do-328-61-hydraulics-leakage-and-functional-checks/documents"}}