{"id":"F2005L03934","name":"AD/DO 328/27 - FDR & CVR Impact G-Switches","slug":"ad-do-328-27-fdr-cvr-impact-g-switches","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39770,"registerId":"commonwealth-F2005L03934-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 328/27 | FDR & CVR Impact G-Switches | 1/2006 |\n| ------------ | --------------------------- | ------ |\n\n| Applicability: | Model 328-100 aeroplanes with serial numbers 3005 to 3119 inclusive.                                                                                                                                                                                                                                           |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | If not previously accomplished, replace the old Flight Data Recorder (FDR) impact G-Switch 3UC and the old Cockpit Voice Recorder (CVR) impact G-Switch5UB with new impact G-Switches part number 3LO-453/4.25 in accordance with Fairchild Dornier Service Bulletin SB-328-31-390 dated 06 September 2001.    |\n|                | Note: LBA AD 2002-239 refers.                                                                                                                                                                                                                                                                                  |\n| Compliance:    | No later than the next A-Check after the effective date of this Directive.                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                                                             |\n| Background:    | The German Luftfahrt-Bundesamt (LBA) has received advice from the aircraft manufacturer that the FDR and CVR impact G-Switches do not meet the design requirements of JAR/FAR § 25.1459 (a) 5. Incorrect operation of the G-Switches may cause the loss of FDR and/or CVR data following an aircraft accident. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/27","sectionType":"part","heading":"AD/DO 328/27","content":"## AD/DO 328/27","sortOrder":1},{"sectionNumber":"FDR & CVR Impact G-Switches","sectionType":"part","heading":"FDR & CVR Impact G-Switches","content":"## FDR & CVR Impact G-Switches","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 aircraft model and component. There is no evidence of scope creep; it addresses exactly the problem identified in the background (faulty G-Switches) with a precise technical solution."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly referenced (A-Check — a standard aviation maintenance interval)","Single, unambiguous requirement with no exceptions or conditional logic","No cross-references to other legislation beyond a single note referencing a German authority document","Clear applicability criteria (specific serial number range)","Straightforward compliance deadline tied to existing maintenance schedule"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Dornier 328-100 aircraft to replace faulty impact sensors in their flight recorders.\n\n**What it does:**\n- **Who must comply:** Anyone operating Dornier 328-100 aircraft with serial numbers 3005 through 3119.\n- **What must be done:** Replace the old impact G-Switches in both the Flight Data Recorder (FDR — the \"black box\" that records flight parameters) and the Cockpit Voice Recorder (CVR — the \"black box\" that records cockpit audio).\n- **The problem:** The existing switches don't meet safety standards (specifically JAR/FAR § 25.1459). If there's a crash, these faulty switches might fail to activate properly, meaning the recorders could lose data when investigators need it most.\n- **When it must be done:** By the next \"A-Check\" (a routine maintenance inspection) after 19 January 2006.\n\n**Why it matters:** Flight recorders are crucial for accident investigation. If the impact sensors don't work, the recorders might stop recording too early or fail to preserve data after a crash — making it harder to find out what went wrong and prevent future accidents."},"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":"This directive implements a corrective maintenance requirement consistent with existing airworthiness safety objectives rather than expanding regulatory scope. It prescribes a specific hardware replacement for a defined fleet subset and a compliance window tied to routine maintenance (next A‑Check), so it narrows action to particular aircraft and parts without broadening obligations beyond the stated safety fix."},"complexity_factors":["Narrow applicability limited to specific serial numbers (3005–3119) — reduces scope but requires serial checks (Applicability).","Specific replacement part number (3LO-453/4.25) and mandated compliance with Fairchild Dornier SB-328-31-390 — technical specificity and reliance on an external service bulletin (Requirement).","Compliance timing tied to the operator's next A‑Check rather than a fixed calendar date — affects scheduling and operational planning (Compliance).","Cross-reference to foreign authority and regulation: LBA AD 2002-239 and JAR/FAR §25.1459(a)5 — introduces regulatory standard-setting and certification rationale (Background).","Operational impacts: parts procurement, maintenance labour and A‑Check sequencing create direct costs for operators (Requirement/Compliance).","Limited operator discretion: mandatory replacement is prescribed with no alternative measures noted (Requirement).","Administrative enforcement by CASA with an effective date specified — formal regulatory obligation (first paragraph/effective date)."],"plain_english_summary":"Requires operators of Dornier 328-100 aeroplanes (serial numbers 3005–3119) to replace the old Flight Data Recorder and Cockpit Voice Recorder impact G-switches with part number 3LO-453/4.25 in accordance with Fairchild Dornier Service Bulletin SB-328-31-390. The directive (effective 19 Jan 2006) ties compliance to the next A‑Check and cites manufacturer and German LBA advice that the existing switches may not meet JAR/FAR §25.1459(a)5, risking loss of crash-recording data."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-27-fdr-cvr-impact-g-switches","history":"/api/acts/ad-do-328-27-fdr-cvr-impact-g-switches/history","analysis":"/api/acts/ad-do-328-27-fdr-cvr-impact-g-switches/analysis","conflicts":"/api/acts/ad-do-328-27-fdr-cvr-impact-g-switches/conflicts","importantCases":"/api/acts/ad-do-328-27-fdr-cvr-impact-g-switches/important-cases","documents":"/api/acts/ad-do-328-27-fdr-cvr-impact-g-switches/documents"}}