{"id":"F2006L02484","name":"AD/DHC-8/127 - Airworthiness Limitation Items","slug":"ad-dhc-8-127-airworthiness-limitation-items","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59673,"registerId":"commonwealth-F2006L02484-current","compilationNumber":null,"startDate":"2026-04-02","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-8/127 | Airworthiness Limitation Items | 9/2006 |\n| ------------ | ------------------------------ | ------ |\n\n| Applicability: | DHC-8 aircraft, Models 400, 401, and 402, with serial numbers 4001, and 4003 through 4094.                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of Transport Canada AD CF-2004-19.                                                                                                                                                                                                                                                                                                                                                         |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of31 August 2006.                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 31 August 2006.                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | During DHC-8-400 type certification fatigue testing, fatigue failures were discovered at the engine isolator bracket and at the orifice support tube, upper bearing and piston plug in the main landing gear shock strut assembly. Failure of these components, which have been identified as principal structural elements, could adversely affect the structural integrity of the engine installation and of the main landing gear. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 July 2006","sortOrder":0},{"sectionNumber":"AD/DHC-8/127","sectionType":"part","heading":"AD/DHC-8/127","content":"## AD/DHC-8/127","sortOrder":1},{"sectionNumber":"Airworthiness Limitation Items","sectionType":"part","heading":"Airworthiness Limitation Items","content":"## Airworthiness Limitation Items","sortOrder":2},{"sectionNumber":"9/2006","sectionType":"part","heading":"9/2006","content":"## 9/2006","sortOrder":3}],"analysis":{"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":"This instrument adopts Transport Canada AD CF‑2004‑19 for the stated DHC‑8 serial numbers and only revises the effective date to 31 August 2006. It does not expand the listed applicability or add obligations beyond those in the referenced AD (Requirement; Compliance)."},"complexity_factors":["Cross-reference to a foreign authority's AD (Transport Canada AD CF-2004-19) — requires legal and operational alignment (Requirement).","Narrow serial-number applicability means operators must check fleet-specific applicability (Applicability).","Technical cause: fatigue failures in engine isolator bracket and shock‑strut components — safety‑critical, technical inspections/limits (Background).","Compliance timing: revised effective date creates an administrative deadline to incorporate the referenced actions (Compliance).","Implementation burden on operators to amend maintenance/airworthiness limitation items and schedule inspections (Requirement; Compliance).","No substantive amendment text provided here — administrative adoption of another AD rather than bespoke provisions."],"plain_english_summary":"This AD requires operators of Bombardier DHC‑8 models 400–402 (serials 4001, 4003–4094) to comply with Transport Canada AD CF‑2004‑19, with a revised effective date of 31 August 2006. Mechanically, it incorporates airworthiness limitation items and mandated inspection/maintenance requirements into affected aircraft programs. Transport Canada found fatigue failures in the engine isolator bracket and in several main landing‑gear shock‑strut parts; those parts are identified as principal structural elements requiring specific actions (Requirement; Background)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive implementing a foreign aviation safety requirement. It maintains its original narrow scope: addressing specific fatigue failures discovered during type certification testing. There is no evidence of scope creep — it targets exactly the components and aircraft identified in the safety testing."},"complexity_factors":["Very short document (under 300 words)","No defined terms section — relies entirely on external reference to Transport Canada AD CF-2004-19","Simple conditional logic: if you own this specific aircraft model with these serial numbers, you must comply","Single cross-reference to one external document","No nested exceptions or conditional compliance pathways","Clear applicability table with explicit serial number ranges"],"plain_english_summary":"This AD makes certain maintenance and inspection tasks from Transport Canada AD CF-2004-19 mandatory for Bombardier DHC-8-400 series (Models 400/401/402) aircraft with serials 4001 and 4003–4094. It targets fatigue cracking risks in the engine isolator bracket and main landing gear shock-strut components — principal structural elements whose failure could cause engine separation or landing-gear collapse. Effective 31 August 2006."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-127-airworthiness-limitation-items","history":"/api/acts/ad-dhc-8-127-airworthiness-limitation-items/history","analysis":"/api/acts/ad-dhc-8-127-airworthiness-limitation-items/analysis","conflicts":"/api/acts/ad-dhc-8-127-airworthiness-limitation-items/conflicts","importantCases":"/api/acts/ad-dhc-8-127-airworthiness-limitation-items/important-cases","documents":"/api/acts/ad-dhc-8-127-airworthiness-limitation-items/documents"}}