{"id":"F2007L04506","name":"AD/DHC-8/103 Amdt 1 - Cockpit Door Hinge Attachment","slug":"ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70953,"registerId":"commonwealth-F2007L04506-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-8/103 Amdt 1 | Cockpit Door Hinge Attachment | 13/2007 |\n| ------------------- | ----------------------------- | ------- |\n\n| Applicability: | DHC-8 aircraft, Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, with serial numbers 003 through 557; equipped with cockpit door installation, part numbers 82510074-( ), 82510294-( ), 82510310-001, 8Z4597-001, H85250010-( ),82510700-( ), or 82510704-( ), except 82510704-502 and 82510704-503.Note: -( ) denotes all dash numbers. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement: | 1. Applicable to aircraft serial numbers 003 through 451, 453 through 463, 465 through 489, 491 through 505, and 507.Modify the cockpit door single-point hinge attachment to a two-point hinge attachment by incorporating Modsum 8Q100859 in accordance with Bombardier Service Bulletin 8-52-54 original issue, dated 12 May 2004, or Revision A, dated5 November 2004, or a later Transport Canada approved revision.Note 1: Installation of Modifications 8/2337 and 8/3339 are required for aircraft serial numbers 003 through 407, 409 through 412, and 414 through 433, before installation of Modsum 8Q100859.2. Applicable to aircraft serial numbers 452, 464, 490, 506, and 508 through 557.Modify the cockpit door single-point attachment to a two-point hinge attachment by incorporating Modsum 8Q900267 in accordance with Bombardier Service Bulletin 8-52-58 original issue, dated 12 May 2004, or a later Transport Canada approved revision.Note 2: Installation of Modsum 8Q200015, is required before installation of Modsum 8Q900267.3. Applicable to aircraft serial numbers 452, 464, 490, 506, and 508 through 557.a. For aircraft that have already accomplished Requirement 2 as of the effective date of this Directive:Rework the cockpit door striker plate and replace the latch block by incorporating Modsum 8Q902145 in accordance with Bombardier Service Bulletin 8-52-61 original issue, dated 20 October 2006, or a later Transport Canada approved revision. |\n| | b. For aircraft that have not already accomplished Requirement 2 as of the effective date of this Directive:Carry out the requirements of Requirement 3.a. concurrent with the requirements of Requirement 2 of this Directive.Note 3: Transport Canada AD CF-2005-34R1 refers. |\n| Compliance: | For Requirements 1 and 2: Within 24 months after 27 October 2005.For Requirement 3.a: Within 12 months after 20 December 2007, unless already accomplished.The compliance time for Requirements 1 and 2 remains unchanged by this issue of the Directive. |\n| | This Amendment becomes effective on 20 December 2007. |\n| Background: | During testing of the cockpit door, it was observed that the door lower hinge block rotated which resulted in disengagement of the mating hinge pin and excessive door deflection. The lower hinge block rotated because it was attached to its support structure with only one attachment bolt, which prevented it from reacting to any moment force. This condition, if not corrected, could result in breakage and uncontrolled release of the cockpit door under certain decompression situations.Amendment 1 is issued in response to a revision of the related Transport Canada AD, which requires rework of the cockpit door striker plate and replacement of the latch block for affected aircraft serial numbers, and additionally, clarifies the Modsums required prior to incorporation of Requirement 2. |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n7 November 2007","sortOrder":0},{"sectionNumber":"AD/DHC-8/103 Amdt 1","sectionType":"part","heading":"AD/DHC-8/103 Amdt 1","content":"## AD/DHC-8/103 Amdt 1","sortOrder":1},{"sectionNumber":"Cockpit Door Hinge Attachment","sectionType":"part","heading":"Cockpit Door Hinge Attachment","content":"## Cockpit Door Hinge Attachment","sortOrder":2},{"sectionNumber":"13/2007","sectionType":"part","heading":"13/2007","content":"## 13/2007","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":6,"scope_assessment":{"changed":true,"description":"Amendment 1 expands and clarifies the original directive: it adds a rework and latch‑block replacement requirement for specified serial numbers (Requirement 3) and clarifies which Modsums are required before incorporation of Requirement 2 (Background; Requirement 2 and accompanying Notes). The amendment leaves the original compliance deadlines for Requirements 1 and 2 unchanged (Compliance)."},"complexity_factors":["Multiple aircraft model and serial‑number subgroups with different required Modsums (Applicability; Requirement 1 and 2).","Staged requirements and prerequisites: some Modsums must be installed before others (Notes in Requirement 1 and 2).","Different actions depending on whether Requirement 2 was already accomplished before the amendment (Requirement 3.a vs 3.b).","Incorporation by reference to Bombardier Service Bulletins and Transport Canada approvals, creating external-document dependency (Requirement 1–3).","Varied compliance times across requirements and an explicit effective date for the amendment (Compliance).","Cross‑reference to a related Transport Canada AD (Background and Note 3), adding regulatory alignment obligations."],"plain_english_summary":"This airworthiness directive requires operators of specified Bombardier DHC‑8 aeroplanes (models and serial ranges listed) to replace the cockpit door single‑point lower hinge with a two‑point hinge by installing specified Modsums and Bombardier service bulletin actions. For certain serial numbers it also mandates striker‑plate rework and latch‑block replacement. Operators must carry out the modifications within set deadlines and satisfy prerequisite Modsums where specified (see Requirements 1–3 and Compliance). The mechanical aim is to stop hinge‑block rotation that can disengage the hinge pin in decompression."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive (AD/DHC-8/103). The original directive required the hinge attachment modification. Amendment 1 adds the striker plate/latch block rework (Requirement 3) and clarifies prerequisite modifications. This represents a natural evolution of the safety directive based on further testing and revised Canadian regulatory requirements, rather than scope creep beyond aviation safety."},"complexity_factors":["Multiple applicability groups based on aircraft serial number ranges (two distinct groups with overlapping requirements)","Nested prerequisites: Requirement 2 requires prior installation of Modsum 8Q200015; Requirement 1 requires prior installation of Modifications 8/2337 and 8/3339 for certain serial numbers","Conditional logic in Requirement 3 distinguishing between aircraft that have/have not accomplished Requirement 2","Cross-reference to external documents: Bombardier Service Bulletins 8-52-54, 8-52-58, and 8-52-61, plus Transport Canada AD CF-2005-34R1","Specific part number ranges with wildcard notation (-( ) denoting all dash numbers) and explicit exclusions (82510704-502 and 82510704-503)","Multiple compliance deadlines tied to different effective dates and conditional on prior completion status"],"plain_english_summary":"This AD orders operators of certain Bombardier DHC‑8 (Dash 8) aircraft to fix a cockpit‑door design flaw: a single lower hinge bolt can allow the door to rotate and detach, risking rapid decompression. A two‑point hinge modification (and, on newer series, striker‑plate/latch rework) must be installed on affected aircraft/door part numbers. It applies to multiple Dash‑8 variants and operators; compliance within the mandated timeframes is required to prevent catastrophic in‑flight failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment","history":"/api/acts/ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment/history","analysis":"/api/acts/ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment/analysis","conflicts":"/api/acts/ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment/conflicts","importantCases":"/api/acts/ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment/important-cases","documents":"/api/acts/ad-dhc-8-103-amdt-1-cockpit-door-hinge-attachment/documents"}}