{"id":"F2007L02121","name":"AD/EC 135/14 - Direct Current Distribution - Separation of Wiring","slug":"ad-ec-135-14-direct-current-distribution-separation-of-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67252,"registerId":"commonwealth-F2007L02121-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter EC 135 Series Helicopters","sectionType":"division","heading":"Eurocopter EC 135 Series Helicopters","content":"### Eurocopter EC 135 Series Helicopters\n\n| AD/EC 135/14 | Direct Current Distribution - Separationof Wiring | 8/2007 |\n| ------------ | ------------------------------------------------- | ------ |\n\n| Applicability: | EC135, all models, and EC635T1, serial numbers (S/N) 0005 up to and includingS/N 0497, except S/N 0028, 0473, 0484, 0492 and 0496.                                                                                                                          |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Modify and separate the direct-current (DC) power supply lines in accordance with the accomplishment instructions of Eurocopter Deutschland EC135 Alert Service Bulletin (ASB) EC135-24A-013 Revision 01 dated 25 May 2007.                                 |\n|                | Actions accomplished before the effective date of this Directive, in accordance with the original issue of Eurocopter Deutschland EC135 ASB EC135-24A-013 dated 12 December 2006, are acceptable for compliance with this Directive.                        |\n|                | Note: EASA AD 2007-0165 refers.                                                                                                                                                                                                                             |\n| Compliance:    | At the next periodical inspection, after the effective date of this Directive, but not later than 31 December 2007.                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 2 August 2007.                                                                                                                                                                                            |\n| Background:    | Under current design regulations JAR-27 and JAR-29, power lines and signal lines may not be routed within one wire harness. Additionally, redundant energy sources may not interfere with each other and must independently supply the aircraft with power. |\n|                | In order to achieve compliance with the design rules, this Directive requires the power lines to be routed in a sufficient distance to each other and to the signal lines.                                                                                  |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n19 June 2007","sortOrder":0},{"sectionNumber":"AD/EC 135/14","sectionType":"part","heading":"AD/EC 135/14","content":"## AD/EC 135/14","sortOrder":1},{"sectionNumber":"Direct Current Distribution - Separation","sectionType":"part","heading":"Direct Current Distribution - Separationof Wiring","content":"## Direct Current Distribution - Separation  \nof Wiring","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific wiring separation issue in a defined helicopter fleet. The scope remains precisely limited to the identified airworthiness concern without expansion into broader operational or maintenance requirements."},"complexity_factors":["Single, specific technical requirement with clear reference to external manufacturer bulletin","Limited conditional logic: only one grandfathering clause (acceptance of prior work under earlier bulletin version)","Narrow applicability: specific aircraft models and serial number range with explicit exclusions","No nested definitions or extensive interpretation section","Straightforward compliance deadline with single extension path (next inspection vs. hard cap date)","Background explanation provided in plain language referencing underlying regulatory purpose"],"plain_english_summary":"This CASA Airworthiness Directive mandates physical separation of DC power and signal wiring on Eurocopter EC135 helicopters and EC635T1s (SN 0005–0497, five SNs excluded) to prevent electrical interference between power sources. Compliance requires following Eurocopter Alert Service Bulletin EC135-24A-013 (Rev 01; earlier edition accepted) by the next inspection after 2 Aug 2007, and no later than 31 Dec 2007. It preserves redundancy and prevents single faults from disabling backup power."},"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":"Scope enforces separation of DC wiring for the explicitly listed helicopter models and serial numbers, consistent with the manufacturer ASB and JAR design rules. The Directive accepts earlier compliance under the original ASB and imposes a deadline tied to periodical inspection, without expanding applicability beyond the stated serial-number list."},"complexity_factors":["Model- and serial-number specific applicability (EC135 all models; EC635T1 S/N range with four specific exclusions).","Mandatory compliance tied to the next periodical inspection with a fixed outer date (31 Dec 2007).","Requirement references a specific manufacturer Alert Service Bulletin (ASB EC135-24A-013 Revision 01).","Acceptance clause for earlier compliance under the original ASB issue (affects evidence of compliance).","Technical standard basis set by external design rules (JAR-27 and JAR-29) constraining routing and redundancy.","Regulatory authority and effective date declared (Delegate of CASA; effective 2 Aug 2007)."],"plain_english_summary":"Requires operators of specified Eurocopter EC135 and EC635T1 helicopters to separate direct-current (DC) power supply lines per Eurocopter ASB EC135‑24A‑013 (Requirement). The modification must be performed at the next periodical inspection after the directive’s effective date and no later than 31 December 2007; work already done under the original ASB is accepted (Compliance). Operators must arrange and pay for the modification to meet JAR‑27/JAR‑29 wiring separation rules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ec-135-14-direct-current-distribution-separation-of-wiring","history":"/api/acts/ad-ec-135-14-direct-current-distribution-separation-of-wiring/history","analysis":"/api/acts/ad-ec-135-14-direct-current-distribution-separation-of-wiring/analysis","conflicts":"/api/acts/ad-ec-135-14-direct-current-distribution-separation-of-wiring/conflicts","importantCases":"/api/acts/ad-ec-135-14-direct-current-distribution-separation-of-wiring/important-cases","documents":"/api/acts/ad-ec-135-14-direct-current-distribution-separation-of-wiring/documents"}}