{"id":"F2006B06902","name":"AD/SD3-60/56 - Air Conditioner System Wiring","slug":"ad-sd3-60-56-air-conditioner-system-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114782,"registerId":"commonwealth-F2006B06902-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/56 - Air Conditioner System Wiring","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nShort SD3-60 Series Aeroplanes\n\nAD/SD3-60/56 Air Conditioner System Wiring 7/99\n\nApplicability: All SD3-60 aircraft that have incorporated Shorts Service Bulletin (SB) SD360-21-21 Original Issue dated August 1994.\n\nRequirement: 1. If not previously accomplished, rewire the aeroplane in accordance with Shorts SB SD360-21-21 Revision 1 dated June 1998.\n\nNote: CAA(UK) AD 011-03-99 and Shorts Mandatory Service Bulletin SD360-21-23 dated 4 March 1999 refers.\n\nCompliance: 1. Before 15 August 1999.\n\nThis Airworthiness Directive becomes effective on 15 July 1999.\n\nBackground: Incorporation of Shorts SB SD360-21-21 Original Issue resulted in wiring changes that inhibited the generator failure slave relay from being energised, this resulted in both load shedding busbars not being able to be brought back on line when override is selected.\n\nRewiring in accordance with Revision 1 of the service bulletin restores correct operation of the generator failure slave relay.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific wiring defect in a specific aircraft model. It has not expanded beyond its original purpose of correcting the generator failure relay issue caused by the original service bulletin installation."},"complexity_factors":["Single, specific aircraft type (SD3-60 Series)","Single applicability condition (previous installation of specific service bulletin)","Single requirement (rewire per specific revision of service bulletin)","No defined terms section — all technical terms are industry standard","No cross-references to other legislation or regulations beyond a note referencing related UK authority documents","Clear, unconditional compliance deadline","Background explanation provided in plain technical language"],"plain_english_summary":"This is a **safety order** (called an \"Airworthiness Directive\") issued by Australia's aviation safety regulator for a specific type of aircraft — the **Short SD3-60 Series** (a small regional turboprop plane).\n\n**What it does:**\nIt requires owners or operators of these aircraft to **rewire the air conditioning system** if they previously installed a specific service bulletin (SB SD360-21-21 Original Issue from August 1994).\n\n**Why it matters:**\nThe original wiring change had a dangerous flaw — it stopped a critical safety relay (the \"generator failure slave relay\") from working properly. This meant that if the generator failed, the aircraft couldn't restore power to essential electrical systems when pilots tried to override the failure. The fix (using Revision 1 of the service bulletin from June 1998) corrects this wiring error.\n\n**Who must comply:**\nAnyone operating an SD3-60 aircraft that installed the August 1994 service bulletin.\n\n**Deadline:**\nThe rewiring must be done **before 15 August 1999**.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A mandatory safety instruction from the aviation regulator — you cannot legally fly the aircraft without complying.\n- **Service Bulletin:** A technical notice from the aircraft manufacturer recommending modifications or inspections.\n- **Load shedding busbars:** Electrical distribution points that can be disconnected (\"shed\") to reduce power demand during emergencies, then reconnected when needed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive confines action to aircraft already modified by the Original Issue service bulletin and requires a corrective rewiring as specified (Applicability; Requirement; Background). It does not expand the class of affected aircraft or add operational restrictions beyond the mandated corrective maintenance and compliance deadline (Compliance)."},"complexity_factors":["Narrow applicability: applies only to SD3‑60 aircraft that have incorporated SB SD360‑21‑21 Original Issue (Applicability).","Technical maintenance action: requires rewiring per a specific service bulletin revision, so certified maintenance personnel and parts are needed (Requirement).","Dependency on external document: the AD mandates compliance by following Shorts SB SD360‑21‑21 Revision 1 (Requirement).","Fixed compliance deadline: a short, non‑extensible date by which operators must complete the work (Compliance).","Safety‑critical electrical effect: relates to generator‑failure slave relay and load‑shedding busbars, so incorrect implementation risks system malfunction (Background).","Verification burden: operators must check whether the Original Issue was previously incorporated to determine applicability (Applicability)."],"plain_english_summary":"This Airworthiness Directive requires operators of Short SD3‑60 aeroplanes that installed Shorts Service Bulletin SD360‑21‑21 (Original Issue, Aug 1994) to rewire those aircraft in accordance with Shorts SB SD360‑21‑21 Revision 1 (June 1998). Compliance must be completed by 15 August 1999. It corrects a wiring change introduced by the original bulletin that prevented the generator-failure slave relay from energising and restoring load‑shedding busbars; the aircraft owner/operator bears the cost and work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-56-air-conditioner-system-wiring","history":"/api/acts/ad-sd3-60-56-air-conditioner-system-wiring/history","analysis":"/api/acts/ad-sd3-60-56-air-conditioner-system-wiring/analysis","conflicts":"/api/acts/ad-sd3-60-56-air-conditioner-system-wiring/conflicts","importantCases":"/api/acts/ad-sd3-60-56-air-conditioner-system-wiring/important-cases","documents":"/api/acts/ad-sd3-60-56-air-conditioner-system-wiring/documents"}}