{"id":"F2006L02197","name":"AD/DHC-8/124 - Airworthiness Limitation Items","slug":"ad-dhc-8-124-airworthiness-limitation-items","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117526,"registerId":"commonwealth-F2006L02197-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-8/124 | Airworthiness Limitation Items | 8/2006 |\n| ------------ | ------------------------------ | ------ |\n\n| Applicability: | DHC-8 Aircraft, Models 400, 401, and 402; with serial numbers 4001, 4003, 4004, 4006, and 4008 through 4126.                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the requirements of Transport Canada AD CF-2006-10.Note: Temporary Revisions, ALI-53 and ALI-54 of Airworthiness Limitation Items of the DHC-8-400 Maintenance Requirements Manual, PSM 1-84-7, refer.                                                                                                                                                                                                                                                                             |\n| Compliance:    | Within 60 days after 3 August 2006, unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 3 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Background:    | A revision has been made to the DHC-8-400 Maintenance Requirements Manual, Airworthiness Limitations Items (ALI). This revision incorporates additional inspection requirements for principal structural elements (PSE) related to fuselage cutouts and revises an existing ALI task on the aft entry door with a lower threshold inspection. The actions required by this Directive are to ensure that fatigue cracking of these components will be detected and corrected before possible fatigue failure. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 June 2006","sortOrder":0},{"sectionNumber":"AD/DHC-8/124","sectionType":"part","heading":"AD/DHC-8/124","content":"## AD/DHC-8/124","sortOrder":1},{"sectionNumber":"Airworthiness Limitation Items","sectionType":"part","heading":"Airworthiness Limitation Items","content":"## Airworthiness Limitation Items","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This Directive expands maintenance obligations relative to the prior ALI set by adding inspections for fuselage cutouts and lowering the inspection threshold for the aft entry door, thereby broadening the set of mandated inspection tasks for the affected aircraft (Background; Requirement)."},"complexity_factors":["Narrow applicability to specific models and listed serial numbers (Applicability), limiting operational scope but requiring precise fleet identification","Cross-reference to Transport Canada AD CF-2006-10 and temporary revisions ALI-53 and ALI-54 (Requirement), creating dependency on external documents","Technical focus on principal structural elements (PSE) at fuselage cutouts and a lower-threshold inspection for the aft entry door (Background), requiring structural inspection expertise","Short compliance window: actions due within 60 days after 3 August 2006 (Compliance), imposing scheduling and resource pressure on operators","Obligation to amend the Maintenance Requirements Manual (Requirement), producing administrative updates and potential training or procedural changes","Limited discretion for operators: the AD prescribes specific inspection tasks rather than outcome-based obligations"],"plain_english_summary":"Mandates that operators of specified Bombardier (De Havilland) DHC‑8‑400 series aeroplanes incorporate Transport Canada AD CF‑2006‑10 (temporary ALI‑53 and ALI‑54) into their Maintenance Requirements Manual and carry out the added or revised inspections for principal structural elements and the aft entry door. Compliance is required within 60 days of 3 August 2006. The stated aim is to detect and correct fatigue cracking before failure, which raises inspection workload and maintenance costs for the affected serial‑numbered aircraft (Requirement; Compliance; Background)."},"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":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing specific fatigue inspection requirements for a defined aircraft fleet. It has not expanded beyond its original purpose of ensuring structural integrity through mandatory maintenance actions."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 2 defined applicability criteria (aircraft models and serial numbers)","Single cross-reference to external Canadian aviation document (Transport Canada AD CF-2006-10)","Simple compliance structure: one deadline (60 days), one alternative (already accomplished)","No nested exceptions or conditional logic","Straightforward technical background explaining the safety rationale","Minimal legislative machinery — operates as a delegated legislative instrument rather than complex statute"],"plain_english_summary":"This CASA Airworthiness Directive mandates that operators of specified Bombardier DHC-8-400 (Q400) serials (4001, 4003, 4004, 4006, 4008–4126; ~126 aircraft) carry out inspections and maintenance per Transport Canada AD CF-2006-10 to detect and repair metal fatigue around fuselage cutouts and the rear entry door. Compliance was mandatory within 60 days of 3 August 2006. It’s a technical safety regulation issued under CASA authority."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-124-airworthiness-limitation-items","history":"/api/acts/ad-dhc-8-124-airworthiness-limitation-items/history","analysis":"/api/acts/ad-dhc-8-124-airworthiness-limitation-items/analysis","conflicts":"/api/acts/ad-dhc-8-124-airworthiness-limitation-items/conflicts","importantCases":"/api/acts/ad-dhc-8-124-airworthiness-limitation-items/important-cases","documents":"/api/acts/ad-dhc-8-124-airworthiness-limitation-items/documents"}}