{"id":"F2005L02842","name":"AD/DO 228/4 - Cockpit and Cabin Auxiliary Heaters","slug":"ad-do-228-4-cockpit-and-cabin-auxiliary-heaters","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":37843,"registerId":"commonwealth-F2005L02842-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Dornier 228 Series Aeroplanes","sectionType":"division","heading":"Dornier 228 Series Aeroplanes","content":"### Dornier 228 Series Aeroplanes\n\n| AD/DO 228/4 | Cockpit and Cabin Auxiliary Heaters | 11/2005 |\n| ----------- | ----------------------------------- | ------- |\n\n| Applicability: | Dornier 228-100, -101, -200, -201, 202 and -212 model aeroplane with option P05 or P09 incorporated.                                                                                                                                                     |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless previously accomplished, modify the internal wiring of the cockpit and cabin auxiliary heaters in accordance with Fairchild Dornier GmbH Service BulletinSB-228-249 dated 19 November 2001.                                                       |\n|                | Note 1: Compliance with this Directive replaces the requirements of All Operator Telefax No. AOT-228-21-024.                                                                                                                                             |\n|                | Note 2: LBA AD 2002-264 refers.                                                                                                                                                                                                                          |\n| Compliance:    | Within six months after the effective date of this Directive.                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 27 October 2005.                                                                                                                                                                                       |\n| Background:    | The German Luftfahrt-Bundesamt (LBA) has been advised of instances of overheating of the internal heating coil on cockpit and cabin auxiliary heaters have occurred.This Directive requires the modification of the cockpit and cabin auxiliary heaters. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n16 September 2005","sortOrder":0},{"sectionNumber":"AD/DO 228/4","sectionType":"part","heading":"AD/DO 228/4","content":"## AD/DO 228/4","sortOrder":1},{"sectionNumber":"Cockpit and Cabin Auxiliary Heaters","sectionType":"part","heading":"Cockpit and Cabin Auxiliary Heaters","content":"## Cockpit and Cabin Auxiliary Heaters","sortOrder":2},{"sectionNumber":"11/2005","sectionType":"part","heading":"11/2005","content":"## 11/2005","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific technical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating a wiring modification to prevent heater overheating."},"complexity_factors":["Very short document (under 300 words)","Only 1 substantive requirement with clear reference to external technical standard (Service Bulletin)","Limited applicability: 6 specific aircraft models with 2 specific options","Simple compliance timeline: single 6-month deadline","No nested exceptions, conditional logic, or defined terms section","Single cross-reference to related German aviation directive"],"plain_english_summary":"This AD mandates a wiring modification to cockpit and cabin auxiliary heaters on Dornier 228-100/101/200/201/202/212 aeroplanes equipped with option P05 or P09, following Fairchild Dornier Service Bulletin SB‑228‑249. It responds to reported heater-coil overheating (fire risk) and requires compliance within six months of 27 October 2005. Previously issued urgent AOT is superseded; aircraft already modified are compliant."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This Directive is narrowly focused on correcting an identified overheating hazard in auxiliary heaters for a defined set of Dornier 228 aircraft with options P05 or P09. It replaces an earlier All Operator Telefax but does not broaden the set of affected aircraft or introduce additional regulatory purposes beyond addressing the overheating issue described in the Background. The scope therefore aligns with the original safety objective and has not expanded materially."},"complexity_factors":["Short document: single mandatory action (modify internal wiring) referenced","Applicability limited to six Dornier 228 model variants with option P05 or P09","One external normative reference: Fairchild Dornier Service Bulletin SB-228-249 (dated 19 Nov 2001)","One fixed compliance period (six months) and one effective date","Two informational notes cross-referencing an All Operator Telefax and an LBA AD"],"plain_english_summary":"**What this directive does (mechanical change)\n\n- Requires modification of the internal wiring of the cockpit and cabin auxiliary heaters on certain Dornier 228 aeroplanes (see Applicability).  The work must be done in accordance with Fairchild Dornier Service Bulletin SB-228-249 dated 19 November 2001. (Requirement)\n- Compliance must be completed within six months after the Directive’s effective date. (Compliance)\n\nWho this affects\n\n- Aircraft owners/operators of Dornier 228-100, -101, -200, -201, -202 and -212 models that have option P05 or P09 installed (Applicability).  If the option is not installed, the Directive does not apply.\n- Maintenance organisations and engineers who will carry out the wiring modification according to the service bulletin.\n\nWhy it matters (stated purpose and practical effect)\n\n- Stated purpose: the German aviation authority (LBA) reported instances of overheating of the internal heating coil in cockpit and cabin auxiliary heaters; the modification is required to address that overheating (Background).  The Directive’s effect is to change the heaters’ internal wiring to reduce the risk of overheating (Requirement).\n\nPractical implementation and who pays\n\n- The operator or owner must arrange and pay for the modification. The work will be performed under maintenance by a qualified organisation using the referenced service bulletin. (Requirement, Compliance)\n- The Directive replaces a prior All Operator Telefax (AOT-228-21-024) and cross-references LBA AD 2002-264; it therefore updates earlier instructions on the same issue. (Note 1, Note 2)\n\nCosts, incentives and trade-offs (implementation risks and burdens)\n\n- Direct costs: parts, labour and aircraft downtime while the modification is carried out. These are borne by the operator/owner.\n- Incentives: operators have a clear incentive to comply within six months to avoid regulatory enforcement and to reduce the risk of heater overheating (which could affect safety and insurance). Non-compliance risks enforcement action and potential grounding.\n- Implementation risk: the work requires compliance with a specific manufacturer service bulletin; availability of parts, qualified maintenance slots and accurate incorporation of the SB instructions are practical constraints. Poor workmanship could leave the hazard unmitigated.\n- Opportunity cost: aircraft out of service for the modification reduce available flight hours and revenue while maintenance is performed.\n- Effects on private choice and competition: the Directive imposes a uniform safety requirement on affected operators; it does not create new commercial privileges or subsidies and does not directly alter market competition beyond imposing a common compliance cost.\n\nConcentrated benefits and diffuse costs\n\n- Benefit concentration: safety improvement accrues to passengers, crew and individual operators of affected aeroplanes. The benefit is concentrated on those specific aircraft types/options.\n- Cost diffusion: the compliance cost is concentrated on owners/operators of the listed Dornier models with P05 or P09. The Directive does not impose costs on unrelated operators.\n\nSummary sentence\n\n- This is a targeted airworthiness directive that requires a manufacturer-specified wiring modification to correct overheating of auxiliary heater coils on a defined subset of Dornier 228 aeroplanes; operators must arrange and pay for the work within six months, with practical costs limited to those operators and carried out to the referenced service bulletin (Applicability; Requirement; Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-228-4-cockpit-and-cabin-auxiliary-heaters","history":"/api/acts/ad-do-228-4-cockpit-and-cabin-auxiliary-heaters/history","analysis":"/api/acts/ad-do-228-4-cockpit-and-cabin-auxiliary-heaters/analysis","conflicts":"/api/acts/ad-do-228-4-cockpit-and-cabin-auxiliary-heaters/conflicts","importantCases":"/api/acts/ad-do-228-4-cockpit-and-cabin-auxiliary-heaters/important-cases","documents":"/api/acts/ad-do-228-4-cockpit-and-cabin-auxiliary-heaters/documents"}}