{"id":"F2006B09164","name":"AD/DHC-8/1 - Ground and Roll Control Spoilers","slug":"ad-dhc-8-1-ground-and-roll-control-spoilers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52896,"registerId":"commonwealth-F2006B09164-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/1 - Ground and Roll Control Spoilers","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-8/1 Ground and Roll Control Spoilers 11/88\n\nApplicability: Model DHC-8 with serial numbers 003 and subsequent.\n\nRequirement: 1. Modify the landing gear proximity switch electronic unit (PSEU) in accordance with De Havilland SB No. 8-32-54 Revision B.\n\n    2. Modify the electrical power phase supply for the PSEU BITE power circuit in accordance with De Havilland SB No. 8-32-55 Revision A.\n\n    3. Remove the placard, and reinstate the equipment previously deactivated by Transport Canada AD CF-86-11 R2 Para 1, 2 and 3, in accordance with the instructions of De Havilland SB No. 8-27-34 Revision C.\n\nNote: Transport Canada AD CF-86-11 R2 and FAA AD 86-14-51 R1 refer. It should be noted however that compliance with either of these documents does not ensure compliance with this AD, unless specific reference is made to the terminating action of the above referenced Service Bulletins.\n\nCompliance: Before issue of a Certificate of Airworthiness.\n\nBackground: Deactivation of the ground spoilers and roll control spoilers was necessary to prevent an uncommanded deployment in the ground mode, and to preclude a hazardous loss of lift in a critical phase of flight. Incorporation of the specified modifications permits removal of the operating limitations and re-establishes normal use of all spoilers in the ground mode.","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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standalone airworthiness directive with a narrow, specific purpose: correcting a known safety defect in a particular aircraft model. It has not expanded beyond its original technical safety intent."},"complexity_factors":["Short, single-purpose directive with only 3 specific requirements","References 3 external technical documents (Service Bulletins) without reproducing their content","Contains one conditional cross-reference to Canadian and US aviation safety directives with a clarifying note","Limited defined terms (only 'PSEU' — Proximity Switch Electronic Unit — requires technical knowledge)","Clear, linear structure: Applicability → Requirement → Compliance → Background"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Bombardier DHC‑8 (Dash 8) aircraft, serial numbers 003 and up, to complete mandated repairs before issuing a Certificate of Airworthiness. It orders specific electronic modifications to fix an unsafe uncommanded spoiler deployment issue, restoring normal ground and roll spoiler function and ensuring safe braking and control on landing. It applies to all affected owners/operators in Australia."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive restores previously deactivated spoiler functions to address the original safety concern (uncommanded ground‑mode deployment and risk of lift loss). Applicability remains limited to DHC‑8 serial 003 onward and the AD does not expand obligations beyond implementing the cited service bulletin corrective actions and removing prior operating limitations."},"complexity_factors":["Technical work on safety‑critical aircraft systems (PSEU and power phase wiring) requires specialised maintenance procedures and approvals.","Compliance depends on implementing multiple manufacturer service bulletins (SB 8-32-54 Rev B, SB 8-32-55 Rev A, SB 8-27-34 Rev C).","Cross-references to Transport Canada AD CF-86-11 R2 and FAA AD 86-14-51 R1, with an explicit non‑equivalence warning, create potential compliance ambiguity.","Mandatory timing: work must be completed before issue of a Certificate of Airworthiness, affecting aircraft return‑to‑service scheduling.","Applicability limited to serial numbers (003 and subsequent), requiring operators to verify airframe eligibility.","Costs and operational downtime fall on operators and maintenance organisations; parts, labour and certification effort create administrative and financial burdens.","Safety‑critical change reduces previous operating restrictions, so regulators and maintainers must ensure correct termination actions are applied exactly as instructed."],"plain_english_summary":"This airworthiness directive requires operators of De Havilland DHC‑8 aeroplanes (serial 003 onward) to carry out manufacturer service‑bulletin modifications that restore normal ground and roll spoiler function and to remove temporary placards and deactivations. Compliance is required before a Certificate of Airworthiness issues.\n\nIt addresses a safety issue: temporary deactivations were introduced to prevent uncommanded ground‑mode spoiler deployment that could cause loss of lift. Operators and maintenance organisations must pay for and perform the prescribed work per the referenced service bulletins."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-1-ground-and-roll-control-spoilers","history":"/api/acts/ad-dhc-8-1-ground-and-roll-control-spoilers/history","analysis":"/api/acts/ad-dhc-8-1-ground-and-roll-control-spoilers/analysis","conflicts":"/api/acts/ad-dhc-8-1-ground-and-roll-control-spoilers/conflicts","importantCases":"/api/acts/ad-dhc-8-1-ground-and-roll-control-spoilers/important-cases","documents":"/api/acts/ad-dhc-8-1-ground-and-roll-control-spoilers/documents"}}