{"id":"F2006L00750","name":"AD/DHC-8/118 - Spoiler Lift Dump Valves","slug":"ad-dhc-8-118-spoiler-lift-dump-valves","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136773,"registerId":"commonwealth-F2006L00750-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-8/118 | Spoiler Lift Dump Valves | 4/2006 |\n| ------------ | ------------------------ | ------ |\n\n| Applicability: | Bombardier Inc. DHC-8 Models 400, 401 and 402, serial numbers 4005, 4006, 4008 through 4015 and 4018 through 4052.                                                                                                                                                                                                                                                                                                                                  |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Replace all spoiler lift dump valves that have a serial number in the range from 5164 through 5264 or from 5267 through 5279.2. Do not install spoiler lift dump valves with a serial number that is in the suspect range any aircraft unless the manufacturing defect has been corrected. These corrected valves are identified with a serial number that includes the suffix ‘A’ (e.g. S/N 5164A).Note: Transport Canada AD CF-2001-44 refers. |\n| Compliance:    | 1. Within 30 days after the effective date of this AD, unless previously accomplished.2. After the effective date of this directive.                                                                                                                                                                                                                                                                                                                |\n|                | This Airworthiness Directive becomes effective on 13 April 2006.                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | The manufacturer of the spoiler lift dump valves has determined that a venting slot was omitted during the manufacture of a batch lot of solenoid armatures. Although the affected spoiler lift dump valves passed acceptance test procedures and no problems have been observed with in-service aircraft, this defect has the potential to prevent the ground spoilers from deploying.                                                             |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n3 March 2006","sortOrder":0},{"sectionNumber":"AD/DHC-8/118","sectionType":"part","heading":"AD/DHC-8/118","content":"## AD/DHC-8/118","sortOrder":1},{"sectionNumber":"Spoiler Lift Dump Valves","sectionType":"part","heading":"Spoiler Lift Dump Valves","content":"## Spoiler Lift Dump Valves","sortOrder":2},{"sectionNumber":"4/2006","sectionType":"part","heading":"4/2006","content":"## 4/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific manufacturing defect in a specific aircraft component. The scope remains precisely limited to the identified safety issue without expansion into broader operational or maintenance requirements."},"complexity_factors":["Very short document (under 300 words)","Only 2 substantive requirements with clear serial number ranges","Single applicability table with explicit aircraft models and serial numbers","No defined terms section or interpretation provisions","No cross-references to other legislation (only a note referencing the Canadian equivalent AD)","Simple temporal compliance structure (30 days from effective date)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This AD requires operators of specified Bombardier DHC-8-400 series aircraft to replace certain spoiler lift-dump valves that were manufactured with a missing venting slot in the solenoid armature. The defect could prevent ground spoilers from deploying after landing, risking inadequate deceleration. Affected valves (serial ranges listed in the AD) must be removed and not reinstalled unless corrected (marked with an “A” suffix); work was required within 30 days of 13 April 2006."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains narrowly targeted: it applies only to specified DHC‑8 models and serial numbers to replace identified defective valves. The text shows no expansion or contraction of scope beyond that targeted remedial action."},"complexity_factors":["Narrow applicability limited to Models 400, 401, 402 and specific serial numbers (Applicability)","Single, discrete technical remedy: replace valves with specified serial numbers (Requirement)","Clear identification rule for corrected parts via an ‘A’ suffix (Requirement)","Short, fixed compliance deadline: within 30 days of effective date (Compliance)","Safety consequence stated (possible prevention of ground‑spoiler deployment) but no complex mitigation options (Background)","Reference to a related foreign AD (Transport Canada AD CF‑2001‑44) but no additional cross‑jurisdictional procedures in this text (Requirement)"],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier DHC‑8 Models 400/401/402 (specific serial numbers listed) to replace spoiler lift‑dump valves with serial numbers 5164–5264 or 5267–5279 and forbids installing valves in those ranges unless they are corrected and re‑marked with an ‘A’ suffix. (Requirement)\n\nOperators must complete the replacements within 30 days of the AD’s effective date (13 April 2006). The manufacturer found a missing venting slot that could prevent ground spoilers from deploying, so operators bear the replacement cost and associated downtime to address the safety defect. (Compliance; Background)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-118-spoiler-lift-dump-valves","history":"/api/acts/ad-dhc-8-118-spoiler-lift-dump-valves/history","analysis":"/api/acts/ad-dhc-8-118-spoiler-lift-dump-valves/analysis","conflicts":"/api/acts/ad-dhc-8-118-spoiler-lift-dump-valves/conflicts","importantCases":"/api/acts/ad-dhc-8-118-spoiler-lift-dump-valves/important-cases","documents":"/api/acts/ad-dhc-8-118-spoiler-lift-dump-valves/documents"}}