{"id":"F2006B09202","name":"AD/DHC-8/47 Amdt 1 - Engine Compartment Hydraulic System","slug":"ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53025,"registerId":"commonwealth-F2006B09202-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/47 Amdt 1 - Engine Compartment Hydraulic System","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-8/47\n\nAmdt 1\n\n  \nEngine Compartment Hydraulic System 13/98\n\nApplicability: All DHC-8 model 100 and 300 series aircraft, serial number 003 through 405\\. Requirement: 1. Aircraft within S/N range 003 through 154.\n\nIncorporate modification 8/1152 to relocate the parking brake accumulator in accordance with de Havilland SB 8-32-128 Revision B dated 30 August 1996.\n\n    2. Aircraft within S/N range 003 through 392.\n\nIncorporate modification 8/1982 to relocate the parking brake charging valve in accordance with de Havilland SB 8-32-128 Revision B dated 30 August 1996.\n\n    3. Aircraft within S/N range 003 through 405.\n\nIncorporate modification 8/1983 to relocate the No.2 standby power unit in accordance with de Havilland SB 8-29-23 dated 06 December 1996, Or\n\nIncorporate modification 8/2781 in accordance with de Havilland SB 8-29-29, dated 27 February 1998 for aircraft where this modification has not been incorporated during manufacture.\n\nUpon incorporation of either modification above, the corresponding Aircraft Flight Manual (AFM) revision identified in section D, compliance, of the applicable Service Bulletin must be inserted in the affected aircraft’s AFM.\n\nNote: Transport Canada AD CF-96-25R2 refers.\n\nCompliance: Unless previously accomplished comply with Requirements 1, 2 and 3, as applicable, prior to 15 June 2000.\n\nThis Airworthiness Directive becomes effective on 3 December 1998.\n\nBackground: The manufacturer has advised that two fuel-fed fires in the engine compartment resulted in fire damage to hydraulic components located in the number 2 engine nacelle. This resulted in total loss of system 1 and 2 hydraulic pressure. Component relocation will ensure hydraulic pressure for rudder operation continues to be maintained.\n\nThe revision of this AD was introduced to allow alternate compliance with requirement 3 of this AD.\n\nThe original issue of this Airworthiness Directive became effective on 27 February 1997.","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":"This amendment introduced an alternate means of compliance for Requirement 3 by permitting modification 8/2781 as an alternative to 8/1983 (for aircraft not modified during manufacture). The overall applicability (S/N 003–405) and the directive's objective (preserve hydraulic pressure after engine‑nacelle fires) remain the same, but operators now have an additional permitted modification path and must still insert the AFM revision identified in the applicable Service Bulletin."},"complexity_factors":["Multiple serial‑number applicability bands requiring different modifications: Requirement 1 (S/N 003–154), Requirement 2 (S/N 003–392), Requirement 3 (S/N 003–405).","Three distinct physical changes specified by different modification numbers (8/1152, 8/1982, 8/1983 or 8/2781) tied to specific Service Bulletins (SB 8‑32‑128 Rev B; SB 8‑29‑23; SB 8‑29‑29).","Alternative compliance allowed for Requirement 3 (either mod 8/1983 or, if not fitted in manufacture, mod 8/2781), adding an options/eligibility decision for operators.","Mandatory insertion of the AFM revision identified in the applicable Service Bulletin after modification — an administrative compliance step linked to operational documentation.","Fixed compliance deadline (15 June 2000) creates scheduling and potential fleet‑downtime pressures for owners/operators.","Safety‑critical system work (hydraulic/standby power) requires certified maintenance capability and access to parts and engineering data from the manufacturer."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier (de Havilland) DHC‑8 model 100 and 300 aeroplanes (serial numbers 003–405) to relocate three hydraulic‑related components and to insert corresponding Aircraft Flight Manual revisions by following specified manufacturer service bulletins and modification kits. The measured change aims to preserve hydraulic pressure for rudder operation after engine‑nacelle fires. The work (and associated parts, labour and downtime) is the responsibility of the aircraft owner/operator and must be done by 15 June 2000 if not already completed."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the Airworthiness Directive. The revision adds an alternative compliance method for Requirement 3 (allowing modification 8/2781 as an alternative to 8/1983) but does not expand the applicability to new aircraft models or introduce new safety objectives beyond the original intent of preventing hydraulic system failure during engine fires."},"complexity_factors":["Multiple overlapping serial number ranges (003–154, 003–392, 003–405) create intersecting applicability conditions","Three distinct modification requirements with different technical references (modifications 8/1152, 8/1982, 8/1983, and alternative 8/2781)","Cross-references to external manufacturer documents (de Havilland Service Bulletins 8-32-128 Rev B, 8-29-23, and 8-29-29)","Conditional logic: \"as applicable\" compliance based on serial number ranges","Alternative compliance pathway for Requirement 3 (modification 8/1983 OR 8/2781)","Mandatory documentation update requirement (Aircraft Flight Manual revision insertion)","External reference to Canadian aviation authority (Transport Canada AD CF-96-25R2)"],"plain_english_summary":"This Airworthiness Directive mandates urgent relocation of three hydraulic components on Bombardier DHC‑8 Dash 8 model 100/300 aircraft (S/N 003–405) to prevent catastrophic loss of hydraulic pressure from engine fires that would disable the rudder. It affects owners/operators of those serials, requires completion by 15 June 2000, and Amendment 1 adds an alternative compliance option for relocating the No.2 standby power unit."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system","history":"/api/acts/ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system/history","analysis":"/api/acts/ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system/analysis","conflicts":"/api/acts/ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system/conflicts","importantCases":"/api/acts/ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system/important-cases","documents":"/api/acts/ad-dhc-8-47-amdt-1-engine-compartment-hydraulic-system/documents"}}