{"id":"F2005L03935","name":"AD/DO 328/26 - Ice and Rain Protection Systems","slug":"ad-do-328-26-ice-and-rain-protection-systems","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39773,"registerId":"commonwealth-F2005L03935-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 328/26 | Ice and Rain Protection Systems | 1/2006 |\n| ------------ | ------------------------------- | ------ |\n\n| Applicability: | Model 328-100 aeroplanes with serial numbers 3005 to 3119 inclusive.                                                                                                                                                                                                                                                                                                                     |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. If not previously accomplished, inspect transient absorption zener (TAZ) diodes and metal oxide varistor (MOV) modules to determine if those parts are outside of tolerance limits, in accordance with the Accomplishment Instructions of Dornier Service Bulletins SB-328-30-417, dated 24 January 2002.                                                                             |\n|                | 2. If any TAZ diode or MOV module is found to be outside of tolerance, replace the faulty part with a new part in accordance with the Accomplishment Instructions of the service bulletin.                                                                                                                                                                                               |\n|                | Note: LBA AD 2002-262 refers.                                                                                                                                                                                                                                                                                                                                                            |\n| Compliance:    | For Requirement1 - Within 30 days after the effective date of this Directive.                                                                                                                                                                                                                                                                                                            |\n|                | For Requirement1 - Before further flight after the Requirement 1 inspection.                                                                                                                                                                                                                                                                                                             |\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 a Revision of the Aircraft Maintenance Manual will provide procedures for the inspection of the TAZ diodes and MOV modules following a lightning strike. This Directive requires an initial inspection of all installed units to detect faulty units affected by earlier lightning strikes. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/26","sectionType":"part","heading":"AD/DO 328/26","content":"## AD/DO 328/26","sortOrder":1},{"sectionNumber":"Ice and Rain Protection Systems","sectionType":"part","heading":"Ice and Rain Protection Systems","content":"## Ice and Rain Protection Systems","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The manufacturer planned AMM procedures for inspections after a lightning strike, but the Directive mandates an initial inspection of all installed TAZ diodes and MOV modules to detect earlier lightning damage, expanding coverage from conditional/reactive inspections to a mandatory fleet‑wide initial check (Background)."},"complexity_factors":["Narrow applicability: only Model 328‑100 with serials 3005–3119 are affected (Applicability).","Single technical action: inspection to tolerance limits and replacement if outside tolerance — limited scope of work but requires precise testing (Requirement 1 & 2).","Procedural dependence: compliance requires following the Accomplishment Instructions of Dornier Service Bulletin SB‑328‑30‑417 (Requirement).","Time pressure: initial inspection must occur within 30 days of the Directive’s effective date, introducing scheduling demands (Compliance).","Operational constraint: any faulty part must be replaced 'before further flight' after inspection, potentially grounding aircraft until parts/techs are available (Compliance).","Parts and maintenance resources: replacement requires availability of serviceable TAZ diodes/MOV modules and qualified maintenance personnel.","Regulatory cross-reference: the AD notes and aligns with a related LBA AD (LBA AD 2002‑262), adding regulatory linkage (Requirement Note & Background)."],"plain_english_summary":"This Directive mandates that operators of Dornier 328‑100 aeroplanes (serial numbers 3005–3119) inspect transient absorption zener (TAZ) diodes and metal oxide varistor (MOV) modules within 30 days, and replace any unit outside tolerance, following Dornier Service Bulletin SB‑328‑30‑417. It is intended to find parts that may have been damaged by past lightning strikes and to restore the ice and rain protection system to specified tolerances."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety issue (lightning damage to electrical protection components). It has not expanded beyond its original purpose of ensuring the airworthiness of specific aircraft components."},"complexity_factors":["Very short document (approximately 250 words of substantive content)","Only 2 defined technical terms (TAZ diode, MOV module) with no formal definitions section","Simple conditional structure: inspect → if faulty, replace","Single cross-reference to German authority document (LBA AD 2002-262) in a non-binding note","Clear, single applicability criterion (specific serial number range)","No nested exceptions or complex compliance alternatives","Straightforward timeline: 30 days for inspection, before next flight for replacement"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's aviation regulator (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners/operators of certain Dornier 328-100 aeroplanes (serial numbers 3005 to 3119) to inspect and potentially replace electrical components called **TAZ diodes** and **MOV modules**. These parts protect the aircraft's ice and rain protection systems from electrical damage, particularly from **lightning strikes**.\n\n**Who it affects:**\n- Owners and operators of 115 specific Dornier 328-100 aircraft (serials 3005–3119)\n- Maintenance engineers responsible for these aircraft\n\n**What must happen:**\n1. **Within 30 days** of 19 January 2006: Inspect all TAZ diodes and MOV modules to check if they're damaged or out of specification\n2. **Before flying again** if any faults found: Replace faulty parts with new ones\n\n**Why it matters:**\nThe German aviation authority discovered that earlier lightning strikes may have damaged these protective components without anyone knowing. Faulty protection could mean the aircraft's ice protection systems fail when needed — a serious safety risk in icing conditions. This directive forces a one-time check to catch hidden damage before it causes problems.\n\n**Key point:** This is a **retrospective safety fix** — it addresses potential damage that may have already occurred, not just preventing future problems."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-26-ice-and-rain-protection-systems","history":"/api/acts/ad-do-328-26-ice-and-rain-protection-systems/history","analysis":"/api/acts/ad-do-328-26-ice-and-rain-protection-systems/analysis","conflicts":"/api/acts/ad-do-328-26-ice-and-rain-protection-systems/conflicts","importantCases":"/api/acts/ad-do-328-26-ice-and-rain-protection-systems/important-cases","documents":"/api/acts/ad-do-328-26-ice-and-rain-protection-systems/documents"}}