{"id":"F2006B09170","name":"AD/DHC-8/15 Amdt 3 - MLG Actuator Support Bracket and Bolts","slug":"ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52914,"registerId":"commonwealth-F2006B09170-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/15 Amdt 3 - MLG Actuator Support Bracket and Bolts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAD/DHC-8/15\n\nAmdt 3\n\n  \nMLG Actuator Support Bracket and Bolts 11/95\n\nApplicability: Model DHC-8 Series 100 and 300, with serial numbers 3 through 400, but not including 391.\n\nRequirement: Action in accordance with the technical requirements of Transport Canada AD CF- 91-25R2.\n\nNote: de Havilland SB 8-54-27 and SB 8-54-34 refer.\n\nCompliance: As specified in the Requirement Document, with a revised compliance of\n\n12 December 1995 for paragraph 3 of the Requirement Document for additional aircraft affected by this amendment of the Directive.\n\nThe compliance of the previous issue of this Directive remains unchanged with an exception as stated in the compliance statement. This Amendment is effective from 12 October 1995.\n\nBackground: An incident occurred where all hydraulic power was lost in-flight when a MLG retract actuator support bracket bolt failed. This occurrence allowed unrestricted actuator movement which resulted in damage to adjacent hydraulic lines.\n\nAmendment 1 required specific torque checks on the bolts, and a non-destructive test on the support bracket if bolt looseness is detected.\n\nAmendment 2 required terminating action in lieu of the on-going repetitive inspections.\n\nAmendment 3 is issued in response to a revision of the Requirement Document, which mandates compliance with Revision A of Service Bulletin 8-54-34 that has new requirements added for a re-torque of the fasteners of the retraction actuator fitting between 50 and 100 flights after incorporation of Modification 8/2049.","sortOrder":0}],"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":4,"scope_assessment":{"changed":true,"description":"Amendment 3 revises the Requirement Document by adding a specific re‑torque requirement (50–100 flights after Mod 8/2049) and revises the compliance date for paragraph 3 to 12 December 1995; it extends these requirements to additional aircraft affected by the amendment while leaving prior compliance statements otherwise unchanged."},"complexity_factors":["Cross-reference to a foreign mandatory document (Transport Canada AD CF‑91‑25R2) rather than full text in the Directive","Serial-number limited applicability (Model DHC‑8 Series 100 and 300, s/n 3–400 except 391)","Multiple technical tasks required (torque checks, non‑destructive testing, re‑torque after a flight-count window, and option for terminating modification)","Interplay of prior amendments (original AD, Amendment 1 and 2) with the current revision (Amendment 3)","Specific scheduling constraint for re‑torque (50–100 flights after Mod 8/2049) creating operational tracking needs","Revised compliance date for a particular paragraph (administrative complexity for record keeping and enforcement)","Safety‑critical nature of the parts involved increases inspection and documentation rigor","Potential need for parts, qualified personnel, and access to NDT resources increases logistical load on operators"],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier/De Havilland DHC‑8 Series 100 and 300 (serials 3–400 except 391) to carry out the technical actions in Transport Canada AD CF‑91‑25R2: bolt torque checks, non‑destructive inspection if looseness is found, and a re‑torque of the main‑landing‑gear retraction actuator fasteners 50–100 flights after Modification 8/2049. A terminating modification may replace repetitive inspections. Compliance deadlines are fixed by the Directive (effective 12 Oct 1995; paragraph 3 revised to 12 Dec 1995)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 3 of an existing Airworthiness Directive. The amendments have remained tightly focused on the original safety issue (MLG actuator support bracket bolt failures). Each amendment has refined the technical requirements without expanding beyond the original mechanical safety concern. Amendment 3 adds a specific re-torque requirement for modified aircraft but does not broaden the scope beyond the landing gear actuator bracket issue."},"complexity_factors":["Short, single-purpose safety directive (approximately 250 words)","Only 4 defined applicability criteria (model series, serial number range, exclusion)","Single cross-reference to Transport Canada AD CF-91-25R2 and two Service Bulletins","Clear compliance deadline (12 December 1995 for specific paragraph)","Straightforward amendment history explaining evolution of requirements","No nested conditional logic or exceptions to exceptions"],"plain_english_summary":"This AD mandates inspections and corrective action on the main landing gear retract actuator support bracket and bolts for certain Bombardier DHC‑8 Series 100/300 (S/N 3–400, excl. 391). Operators must follow Transport Canada AD CF‑91‑25R2, including torque checks, non‑destructive testing when looseness is found, and required re‑torque after a specified modification. It prevents in‑flight hydraulic loss from bolt failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts","history":"/api/acts/ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts/history","analysis":"/api/acts/ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts/analysis","conflicts":"/api/acts/ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts/conflicts","importantCases":"/api/acts/ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts/important-cases","documents":"/api/acts/ad-dhc-8-15-amdt-3-mlg-actuator-support-bracket-and-bolts/documents"}}