{"id":"F2006B08588","name":"AD/CL-600/28 - Sunstrand Air Driven Generator","slug":"ad-cl-600-28-sunstrand-air-driven-generator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51450,"registerId":"commonwealth-F2006B08588-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/28 - Sunstrand Air Driven Generator","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)  \nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/28 Sunstrand Air Driven Generator 12/94\n\nApplicability: Canadair Challenger aircraft with the following serial numbers, equipped with Sundstrand Air Driven Generator (ADG) uplock assemblies part number 721863, 721863A or 721863B:\n\nCL-600-1A11 serial numbers 1004 to 1085 inclusive,\n\nCL-600-2A12 serial numbers 3001 to 3066 inclusive, and CL-600-2B16 serial numbers 5001 to 5150 inclusive.\n\nRequirement: 1. Check the integrity of the ADG uplock internal pin in accordance with the Accomplishment Instructions Section 2.B of Canadair Service Bulletin 600-0638 (for CL-600-1A11 aircraft) or Service Bulletin 601-0430 (for CL-600-2A12 and CL-600-2B16 aircraft) both dated 25 April 1994. (This check is not required if a modified ADG uplock assembly is installed within 150 flight hours from 10 November 1994 to satisfy Requirement 2 of this Directive).\n\n    2. Install a modified ADG uplock assembly, part number 721863C (all models) or M721863 (for CL-600-1A11 aircraft only) in accordance with the Accomplishment Instructions Section 2.A of Canadair Service Bulletin 600-0638 (for CL-600-1A11 aircraft) or Service Bulletin 601-0430 (for CL-600-2A12 and CL-600-2B16 aircraft) both dated 25 April 1994.\n\n    3. Perform a rigging check in accordance with the Accomplishment Instructions Section 2.C of Canadair Service Bulletin 600-0638 (for CL-600-1A11 aircraft) or Service Bulletin 601-0430 (for CL-600-2A12 and CL-600-2B16 aircraft) both dated 25 April 1994.\n\nNote: Transport Canada Aviation AD CF-94-13 dated 1 September 1994 refers.\n\nCompliance: 1. Within 150 flight hours from 10 November 1994.\n\n    2. Prior to 10 November 1995.\n\n    3. Immediately following completion of the actions specified by either Requirement 1 or 2.\n\nBackground: Operators have reported six incidents where the ADG has not deployed upon operation of the manual release system. Inspection of the manual release system found that a broken shaft pin in the ADG uplock assembly had prevented the uplock mechanism from releasing the ADG when the manual system was operated.\n\nCompliance with this Directive will detect and correct these problems in the ADG manual deployment system.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Multiple conditional requirements (Requirement 1 inspection is waived if Requirement 2 replacement is done within 150 flight hours)","Three different aircraft sub-models with different serial number ranges requiring different service bulletins","Two different replacement part numbers depending on aircraft model (721863C for all, M721863 for CL-600-1A11 only)","Cross-reference to Canadian aviation authority directive (Transport Canada AD CF-94-13)","Specific technical terminology requiring aviation engineering knowledge (ADG uplock, rigging check, service bulletins)","Multiple compliance deadlines tied to different requirements and events (flight hours vs calendar dates vs completion of prior actions)"],"plain_english_summary":"This Airworthiness Directive orders owners/operators of specified Bombardier Challenger CL-600 series jets (listed serials) to inspect and ultimately replace a Sundstrand ADG uplock (p/n 721863/721863A/721863B) because an internal pin can break and prevent the Air Driven Generator from deploying in an emergency. Inspections or interim replacements are required within 150 flight hours of 10 Nov 1994, full replacement by 10 Nov 1995, and rigging checks after the work. It prevents loss of critical backup electrical power after six reported failures."},"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive is narrowly remedial and limited to a specific mechanical fault (broken shaft pin in the ADG uplock) on a defined set of aircraft and parts. It does not broaden regulatory scope beyond correcting that safety issue; it prescribes inspection or replacement and a rigging check, consistent with the original airworthiness‑directed purpose of detecting and correcting unsafe conditions."},"complexity_factors":["Applicability defined by three specific serial‑number ranges (numerical ranges may require checking registries)","Three original uplock part numbers subject to inspection (721863, 721863A, 721863B) and two replacement part numbers (721863C, M721863)","Three substantive requirements (inspect, replace, rigging check) with ordered timing","Two service bulletins referenced (CL‑600 and CL‑601 family bulletins dated 25 April 1994) for procedural detail (workmanship delegated to those documents)","Two compliance deadlines (150 flight hours from 10 Nov 1994; prior to 10 Nov 1995) and a conditional exemption that removes Requirement 1 if Requirement 2 is done within the 150‑hour window","Single technical root cause (broken shaft pin) so substantive technical complexity is low","Cross‑reference to a Transport Canada AD (CF‑94‑13)"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- It applies to specific Bombardier (Canadair) CL-600 Challenger aeroplanes (three serial‑number ranges) that are fitted with certain Sundstrand Air Driven Generator (ADG) uplock assemblies (part numbers 721863, 721863A or 721863B).\n\n- Operators must do one of two things and then a follow‑up check:\n  - Requirement 1: Inspect the internal pin of the ADG uplock (a specific component of the manual deployment system) according to the instructions in the applicable Canadair Service Bulletin, or\n  - Requirement 2: Install a modified ADG uplock assembly (part number 721863C for all models, or M721863 for CL‑600‑1A11 aircraft) according to the same service bulletins.\n  - Requirement 3: After doing either the inspection or the replacement, perform a rigging check per the service bulletin instructions.\n\n- Timing (compliance):\n  - The inspection (Requirement 1) must be completed within 150 flight hours from 10 November 1994.\n  - The replacement (Requirement 2) must be completed before 10 November 1995.\n  - The rigging check (Requirement 3) must be done immediately after completing either Requirement 1 or Requirement 2.\n\n- There is a conditional exemption: if the modified uplock assembly is installed within the 150 flight‑hour window counted from 10 November 1994, then the inspection in Requirement 1 is not required.\n\n- The directive refers to two Canadair Service Bulletins (dated 25 April 1994) for the detailed step‑by‑step workmanship and checks. It also notes a related Transport Canada Airworthiness Directive.\n\n**Who this affects**\n\n- Aircraft owners and operators of the specified Bombardier (Canadair) CL‑600 models with the listed serial numbers and fitted with the specified Sundstrand uplock parts. Maintenance organisations performing the work will also be affected because they must follow the service bulletin procedures.\n\n**Why it matters (the safety issue and mechanism)**\n\n- The background states six incidents were reported where the ADG failed to deploy using the manual release. Inspections found broken shaft pins in the ADG uplock assembly that could prevent manual release of the ADG. The ADG is a device that can supply essential electrical power if primary systems fail, so failure to deploy on manual command is a safety risk.\n\n**Who pays, who decides, and what changes in behaviour**\n\n- Who pays: aircraft owners/operators pay for labour, parts (the modified uplock assembly where required), and the aircraft downtime while the work is done.\n- Who decides: the Civil Aviation Safety Authority issues the directive and enforces compliance; the operator/maintenance organisation decides scheduling and which approved personnel or organisations perform the inspections and installations, following the mandated service bulletin procedures.\n- Behaviour changes: operators must inspect or replace the uplock assembly and perform the rigging check by the set deadlines; maintenance shops must follow the specific service bulletin procedures and record compliance.\n\n**Costs, incentives, trade‑offs and implementation notes**\n\n- Direct costs: parts (the specific upgraded uplock assembly part numbers), maintenance labour, and out‑of‑service time for affected aircraft. These costs are concentrated on the operators of the listed serial‑number aircraft.\n- Supplier effects: the required replacement uses specific part numbers. That concentrates demand for those parts with OEM or approved suppliers; operators may have limited sourcing options for a certified part, which can affect price and lead times.\n- Operational trade‑offs: operators must balance completing the work within the flight‑hour/deadline windows against maintaining schedules; compliance may require short‑term capacity adjustments.\n- Compliance burden and risk: the directive relies on compliance with the referenced service bulletins. Implementation risk includes delays obtaining parts or trained maintenance, and the possibility of human error in inspections or rigging checks. The directive prescribes follow‑up rigging checks immediately after the work to reduce some of that risk.\n\n**Scope and targeting**\n\n- The directive is narrowly targeted: it lists specific aircraft serial numbers and specific uplock part numbers. Its purpose (as stated in the directive) is corrective and limited to fixing or detecting broken pins that prevent manual ADG deployment.\n\n**Cross‑jurisdictional note**\n\n- The directive cites a corresponding Transport Canada AD, indicating alignment with the Canadian authority on the same safety issue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-28-sunstrand-air-driven-generator","history":"/api/acts/ad-cl-600-28-sunstrand-air-driven-generator/history","analysis":"/api/acts/ad-cl-600-28-sunstrand-air-driven-generator/analysis","conflicts":"/api/acts/ad-cl-600-28-sunstrand-air-driven-generator/conflicts","importantCases":"/api/acts/ad-cl-600-28-sunstrand-air-driven-generator/important-cases","documents":"/api/acts/ad-cl-600-28-sunstrand-air-driven-generator/documents"}}