{"id":"F2005L03949","name":"AD/DO 328/14 - Engine Air Intake De Icing System","slug":"ad-do-328-14-engine-air-intake-de-icing-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39807,"registerId":"commonwealth-F2005L03949-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 328/14 | Engine Air Intake De Icing System | 1/2006 |\n| ------------ | --------------------------------- | ------ |\n\n| Applicability: | Dornier 328-100 aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Carry out an inspection of the engine air intake de-icing boots in accordance with paragraph 2.B.1 of Dornier 328 Service Bulletin No. SB-328-30-432 dated26 April 2002 or later LBA approved revisions.2. Carry out an inspection and operational check of the engine air intake de-icing boots in accordance with paragraph 2.B.2 of Dornier 328 Service Bulletin No. SB-328-30-432 dated 26 April 2002 or later LBA approved revisions.Note: LBA AD 2002-256 refers. |\n| Compliance:    | 1. At intervals not to exceed 60 flight hours.2. At intervals not to exceed 800 flight hours.                                                                                                                                                                                                                                                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Background:    | The engine air intake de-icing system eliminates any ice formation on the leading edges of the engine air intakes. There have been several problems with debonded or delaminated de-icing boots. The consequence following a debonding or delamination of the engine-inlet de-icing boot could be an engine failure due to severe intake flow restriction.                                                                                                                 |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n29 November 2005","sortOrder":0},{"sectionNumber":"AD/DO 328/14","sectionType":"part","heading":"AD/DO 328/14","content":"## AD/DO 328/14","sortOrder":1},{"sectionNumber":"Engine Air Intake De Icing System","sectionType":"part","heading":"Engine Air Intake De Icing System","content":"## Engine Air Intake De Icing System","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 is a standard, narrow Airworthiness Directive addressing a specific technical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined compliance intervals (60 and 800 flight hours)","Single cross-reference to German aviation authority (LBA) AD 2002-256","No nested conditions or exceptions","Straightforward applicability (single aircraft model)","Clear, single-purpose safety requirement with no discretionary elements"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on aircraft.\n\n**What it does:**\nThis directive orders operators of **Dornier 328-100 aeroplanes** to inspect and test the **engine air intake de-icing boots** — the rubber-like covers on the front edges of the engine intakes that prevent ice buildup.\n\n**Why it matters:**\nIce on engine intakes can restrict airflow and cause **engine failure**. The directive was issued because some de-icing boots were found to be **debonding** (coming unstuck) or **delaminating** (layers separating). If this happens, pieces of the boot could break off and block the engine intake.\n\n**What must be done:**\n- **Visual inspection** of the boots every **60 flight hours**\n- **Operational check** (testing that the system works) every **800 flight hours**\n\nBoth tasks must follow specific instructions in a **Dornier Service Bulletin** (a manufacturer-issued maintenance guide).\n\n**Who it affects:**\nAnyone operating or maintaining Dornier 328-100 aircraft in Australia — typically regional airlines and charter operators using these 30-seat turboprop planes."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD stays within the original safety-focused purpose described in the Background — to detect and remedy debonding or delamination of engine air-intake de-icing boots to avoid intake flow restriction and possible engine failure. It does not broaden regulatory reach beyond inspection and operational-check obligations tied to the manufacturer Service Bulletin; it does not add unrelated requirements or expand to other aircraft types."},"complexity_factors":["Single aircraft type: Dornier 328-100 only (low scope breadth)","Short text with 2 distinct mandated actions (visual inspection and inspection+operational check)","Two fixed compliance intervals (60 flight hours and 800 flight hours) — simple conditional timing","Dependency on an external technical document (Dornier Service Bulletin SB-328-30-432) and its later LBA-approved revisions — introduces some cross-document tracking","Reference to an external airworthiness authority AD (LBA AD 2002-256) but no nested exceptions or complex derogations","No large set of defined terms, no layered exceptions, and no multiple compliance pathways"],"plain_english_summary":"**What this rule does**\n\n- This Airworthiness Directive (AD) applies to Dornier 328-100 aeroplanes. (Applicability)\n- It requires operators to inspect the engine air-intake de-icing boots following the procedures in Dornier Service Bulletin SB-328-30-432 (dated 26 April 2002) or any later revision approved by the German Luftfahrt-Bundesamt (LBA). (Requirement)\n- There are two mandated checks: a visual inspection (paragraph 2.B.1 of the Service Bulletin) and an inspection plus an operational check (paragraph 2.B.2 of the Service Bulletin). (Requirement)\n- The visual inspection must be done at intervals not exceeding 60 flight hours; the inspection plus operational check must be done at intervals not exceeding 800 flight hours. (Compliance)\n- The stated safety reason is that debonded or delaminated de-icing boots on the engine air intake can restrict airflow and could lead to engine failure if not found and fixed. (Background)\n\n**Who must act**\n\n- The legal duty to comply falls on the aircraft operator (the organisation that controls the Dornier 328-100’s maintenance and operation). The actual work will be carried out by maintenance personnel authorised to perform inspections and operational checks under the Service Bulletin procedures. (Requirement / Compliance)\n\n**Why it matters (mechanically)**\n\n- The AD imposes recurring maintenance actions designed to detect deterioration of the rubber de-icing boots on the engine intakes before that damage becomes severe enough to restrict airflow and risk an engine problem. (Background / Requirement)\n\n**Practical effects and implementation points**\n\n- Operators must obtain and follow Dornier SB-328-30-432 (26 April 2002) or a later LBA-approved revision; keeping track of later approved revisions is part of compliance. (Requirement)\n- Inspections at 60-flight-hour intervals are frequent and will affect line maintenance schedules; the 800-hour operational check is less frequent but more involved. (Compliance)\n- If an inspection finds delamination or debonding, the operator must perform corrective maintenance (repair or replace the boot) before further flight as required by standard airworthiness practice and the Service Bulletin procedures. The AD itself points to the Service Bulletin for instructions on what to do. (Requirement / Background)\n\n**Who pays and who decides**\n\n- The operator pays for the inspections, any ensuing repairs or replacements, and for scheduling any necessary aircraft downtime. Maintenance organisations decide how to slot the checks into routine maintenance cycles and whether to use in-house or contracted resources. (Compliance / Requirement)\n\n**Trade-offs, burdens and risks (analyst notes)**\n\n- Cost and scheduling burden: frequent inspections (every 60 hours) increase direct maintenance cost and create planning constraints, particularly for operators with few aircraft. (Compliance)\n- Benefits concentrated in safety of individual aircraft and passengers; costs are borne by the operators in a direct, measurable way. (Background / Compliance)\n- Administrative burden: compliance requires following an external document (the Dornier Service Bulletin) and monitoring any later LBA-approved revisions named in the AD. That creates a dependence on external technical guidance and record-keeping obligations. (Requirement)\n- Implementation risk: if an operator misunderstands which Service Bulletin revision is current or fails to perform the checks at the required intervals, the safety goal may not be achieved. (Requirement)\n- Competitive impact: the AD applies to a single aircraft type and so does not preferentially treat competing models, but the absolute cost may affect small operators disproportionately. (Applicability / Compliance)\n\n**Source-claimed purpose and how the rule pursues it**\n\n- The AD claims its purpose is to prevent engine failures caused by intake flow restriction from delaminated de-icing boots. Mechanically, it pursues that purpose by mandating periodic inspections and an operational check using procedures specified in the manufacturer Service Bulletin; detection leads to repair or replacement under normal maintenance processes. (Background / Requirement)\n\n(References in this AD: Applicability; Requirement — Dornier SB-328-30-432 dated 26 April 2002 or later LBA-approved revisions; Compliance intervals of 60 and 800 flight hours; Background description of risk.)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-328-14-engine-air-intake-de-icing-system","history":"/api/acts/ad-do-328-14-engine-air-intake-de-icing-system/history","analysis":"/api/acts/ad-do-328-14-engine-air-intake-de-icing-system/analysis","conflicts":"/api/acts/ad-do-328-14-engine-air-intake-de-icing-system/conflicts","importantCases":"/api/acts/ad-do-328-14-engine-air-intake-de-icing-system/important-cases","documents":"/api/acts/ad-do-328-14-engine-air-intake-de-icing-system/documents"}}