{"id":"F2008L03367","name":"AD/DHC-8/142 - Spoiler Disconnect Sensing Device","slug":"ad-dhc-8-142-spoiler-disconnect-sensing-device","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":120289,"registerId":"commonwealth-F2008L03367-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Boeing Canada/De Havilland) ","sectionType":"division","heading":"Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","content":"### Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n| AD/DHC-8/142 | Spoiler Disconnect Sensing Device | 10/2008 |\n| ------------ | --------------------------------- | ------- |\n\n| Applicability: | Bombardier Inc. DHC-8 Models 102, 103, 106, 201, 202, 301, 311, 314 and 315, Serial Numbers 003 thru 644 inclusive; andBombardier Inc. DHC-8 Models 400, 401 & 402, Serial Numbers 4003, 4004, 4006 and 4008 thru 4164 inclusive. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Applicable to Bombardier Inc. DHC-8 Models 102, 103, 106, 201, 202, 301, 311, 314 and 315, Serial Numbers 003 thru 561:(a) For aircraft that have already had the fuselage spoiler cable disconnect sensing device, Modsum 8Q100898, installed - Inspect the fuselage spoiler cable disconnect sensing device for correct assembly in accordance with Paragraph 3.B, PART A of Bombardier Service Bulletin (SB) 8-27-107, initial issue dated 16 October 2007, or later approved revisions.Note 1: Modsum 8Q100898 may have already been incorporated in service (Service Bulletin 8-27-89 and AD/DHC-8/126 apply).(b) For aircraft that have not yet had the fuselage spoiler cable disconnect sensing device, Modsums 8Q100898, installed - Concurrently with the incorporation of Modsums 8Q100898 (SB 8-27-89 and AD/DHC-8/126 apply), inspect the fuselage spoiler cable disconnect sensing device for correct assembly in accordance with Paragraph 3.B, PART A of Bombardier SB 8-27-107, initial issue dated 16 October 2007, or later approved revisions.(c) If the sensing device is correctly assembled, no further action is required.(d) If an incorrectly assembled sensing device is detected, inspect the components, replace if worn or damaged and correctly re-assemble the device in accordance with Paragraph 3.B, PART B of Bombardier SB8-27-107, initial issue dated 16 October 2007, or later approved revisions.2. Applicable to Bombardier Inc. DHC-8 Models 102, 103, 106, 201, 202, 301, 311, 314 and 315, Serial Numbers 562 thru 644:Note 2: The fuselage spoiler cable disconnect sensing device was installed in production. |\n\n| | (a) Inspect the fuselage spoiler cable disconnect sensing device for correct assembly in accordance with Paragraph 3.B, PART A of Bombardier SB8-27-107, initial issue dated 16 October 2007, or later approved revisions.(b) If the sensing device is correctly assembled, no further action is required.(c) If an incorrectly assembled sensing device is detected, inspect the components, replace if worn or damaged and correctly re-assemble the device in accordance with Paragraph 3.B, PART B of Bombardier SB8-27-107, initial issue dated 16 October 2007, or later approved revisions.3. Applicable to Bombardier Inc. DHC-8 Models 400, 401 & 402, Serial Numbers 4003, 4004, 4006 and 4008 thru 4164:Note 3: The fuselage spoiler cable disconnect sensing device was installed in production.(a) Inspect the fuselage spoiler cable disconnect sensing device for correct assembly in accordance with Paragraph 3.B, PART A of Bombardier SB84-27-34, initial issue dated 3 October 2007, or later approved revisions.(b) If the sensing device is correctly assembled, no further action is required.(c) If an incorrectly assembled sensing device is detected, inspect the components, replace if worn or damaged and correctly re-assemble the device in accordance with Paragraph 3.B, PART B of Bombardier SB84-27-34, initial issue dated 3 October 2007, or later approved revisions.Note 4: Transport Canada AD CF-2008-28 dated 10 July 2008 refers. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | Within 1000 flight hours after the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 25 September 2008. |\n| Background: | A fuselage spoiler cable disconnect sensing device was installed in production on later DHC-8 Series 100/200/300 aircraft and on all DHC-8 Series 400 aircraft. On earlier DHC-8 Series 100/200/300 aircraft, its installation was mandated by AD/DHC-8/126.However, several incorrectly assembled spoiler cable disconnect sensing devices have recently been discovered on in-service aircraft. A pulley and plastic spacer had been inadvertently interchanged during assembly of the device in production, resulting in the spoiler cable sliding on the spacer rather than running on the pulley, as designed. |\n\n| | Continued operation with an incorrectly assembled spoiler cable disconnect sensing device could result in impaired operation of the sensing device and/or an eventual fuselage spoiler cable disconnect, with possible reduced controllability of the aircraft. |\n| --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n6 August 2008","sortOrder":0},{"sectionNumber":"AD/DHC-8/142","sectionType":"part","heading":"AD/DHC-8/142","content":"## AD/DHC-8/142","sortOrder":1},{"sectionNumber":"Spoiler Disconnect Sensing Device","sectionType":"part","heading":"Spoiler Disconnect Sensing Device","content":"## Spoiler Disconnect Sensing Device","sortOrder":2},{"sectionNumber":"10/2008","sectionType":"part","heading":"10/2008","content":"## 10/2008","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original scope as a targeted safety inspection mandate for a specific mechanical defect. It does not expand beyond its original purpose of addressing the incorrectly assembled spoiler disconnect sensing device."},"complexity_factors":["Multiple applicability categories based on aircraft model, serial number ranges, and whether a previous modification was installed (creating three distinct compliance paths)","Cross-references to other Airworthiness Directives (AD/DHC-8/126) and manufacturer Service Bulletins (SB 8-27-107, SB 8-27-89, SB84-27-34)","Conditional logic: different actions required depending on inspection results (correct assembly vs. incorrect assembly)","Nested compliance requirements: some aircraft must comply with this AD concurrently with another modification (Modsum 8Q100898)","Technical aviation terminology throughout (Modsum, Service Bulletin, fuselage spoiler cable, serial number ranges) requiring domain knowledge to interpret"],"plain_english_summary":"Owners/operators of specific Bombardier DHC‑8 (Dash 8) Series 100/200/300/400 aircraft must inspect the spoiler disconnect sensing device because some were assembled with the pulley and plastic spacer swapped. The error can cause cable rubbing, wear, sensor failure or cable disconnect, degrading spoiler control—especially at landing. Inspect within 1,000 flight hours of 25 Sep 2008 and repair/replace any damaged or incorrectly assembled parts per manufacturer instructions."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The AD maintains the original safety objective: ensuring correct assembly of the fuselage spoiler cable disconnect sensing device across the listed DHC‑8 models and serial numbers. It clarifies inspection and corrective‑action steps for both production‑installed and retrofit installations, but does not expand to aircraft outside the stated model/serial ranges."},"complexity_factors":["Multiple affected model series and non‑contiguous serial number ranges (Series 100/200/300 and Series 400) increase tracking and applicability complexity.","Conditional requirements depending on whether the Modsum 8Q100898 was previously installed or installed in production vs retrofit (paragraphs 1–3).","References to several Bombardier Service Bulletins (SB 8‑27‑107, SB 8‑27‑89, SB84‑27‑34) and to specific paragraphs (3.B PART A/B) create dependency on external documents and approved revisions.","Two-step action: inspect for correct assembly and, if incorrect, inspect components, replace worn/damaged parts and reassemble per SB instructions — requires parts availability and maintenance labour.","Compliance deadline of 1,000 flight hours imposes operational scheduling and recordkeeping burdens for operators.","Cross‑references to prior AD (AD/DHC‑8/126) and Modsum history require review of maintenance records to determine applicability.","Allowing 'later approved revisions' of service bulletins introduces regulatory discretion about acceptable procedures."],"plain_english_summary":"This Airworthiness Directive orders operators of specified Bombardier DHC‑8 models/serials to inspect the fuselage spoiler cable disconnect sensing device and, if it is misassembled, replace worn parts and reassemble according to Bombardier service bulletins. Compliance is required within 1,000 flight hours of the effective date. It affects the listed aircraft owners/operators (who pay inspection and repair costs) and is enforced by the regulator because incorrect assembly can impair the device or lead to a spoiler cable disconnect and reduced controllability."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-142-spoiler-disconnect-sensing-device","history":"/api/acts/ad-dhc-8-142-spoiler-disconnect-sensing-device/history","analysis":"/api/acts/ad-dhc-8-142-spoiler-disconnect-sensing-device/analysis","conflicts":"/api/acts/ad-dhc-8-142-spoiler-disconnect-sensing-device/conflicts","importantCases":"/api/acts/ad-dhc-8-142-spoiler-disconnect-sensing-device/important-cases","documents":"/api/acts/ad-dhc-8-142-spoiler-disconnect-sensing-device/documents"}}