{"id":"F2006B09227","name":"AD/DHC-8/7 Amdt 1 - Electronic Engine Control Units","slug":"ad-dhc-8-7-amdt-1-electronic-engine-control-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53104,"registerId":"commonwealth-F2006B09227-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/7 Amdt 1 - Electronic Engine Control Units","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-8/7\n\nAmdt 1\n\n  \nElectronic Engine Control Units 3/90\n\nApplicability: All DHC-8 series aeroplanes as detailed in the Requirement Documents.\n\nRequirement: 1. Incorporate modification No 8/0597 in accordance with DHC-8 SB 8-73-7 Revision E dated 14 October 1988 or later revision.\n\n    2. Incorporate modification No 8/0598 in accordance with DHC-8 SB 8-71-10 Revision B dated 14 October 1988 or later revision.\n\n    3. Incorporate modification No 8/0964 in accordance with DHC-8 SB 8-72-2 Revision A dated 14 October 1988 or later revision.\n\n    4. Incorporate modification No 8/0813 in accordance with DHC-8 SB 8-72-4 Revision A dated 14 October 1988 or later revision.\n\n    5. Incorporate modification No 8/1416 in accordance with DHC-8 SB 8-61-16 dated 15 December 1989 or later revision.\n\nNote: Transport Canada Airworthiness Directive CF 85-06 R2 also refers.\n\nCompliance: Prior to 10 August 1990.\n\nBackground: This AD is issued to require incorporation of five modifications which, when incorporated will minimize the danger of lightning transient-induced damage to the electronic engine control units. Amendment 1 to this AD is issued to include a requirement to incorporate an additional modification (Requirement 5) as advised by Boeing Canada de Havilland Division.","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 amendment remains tightly scoped to its original purpose — preventing lightning damage to engine control units in DHC-8 aircraft. The addition of a fifth modification (Requirement 5) is a technical expansion within the same safety objective, not a broadening of the directive's scope to new aircraft types, systems, or regulatory purposes."},"complexity_factors":["Highly technical content referencing specific manufacturer service bulletins (SB 8-73-7, SB 8-71-10, etc.) and modification numbers","Requires cross-referencing to external technical documents not included in the legislative text","Contains one conditional amendment (Amendment 1 adds Requirement 5 to the original 4 requirements)","Short, single-purpose instrument with minimal defined terms (only implicit definitions through technical references)","No nested legislative provisions or complex conditional logic — straightforward command structure"],"plain_english_summary":"This Airworthiness Directive mandates that all Australian operators and maintenance organisations for Bombardier DHC‑8 (Dash 8) aircraft install five specific modifications to protect Electronic Engine Control units from lightning‑induced electrical transients. Completion (per the manufacturer’s Service Bulletins) was required by 10 August 1990; an amendment added a fifth modification after new manufacturer advice. The work prevents lightning damage that could cause loss of engine power control."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the original directive by adding a fifth required modification (No 8/1416 per DHC‑8 SB 8‑61‑16 dated 15 December 1989), increasing the work operators must carry out and the associated compliance burden."},"complexity_factors":["Applicability to all DHC‑8 series aeroplanes increases the number of affected operators and fleet-wide coordination.","Requirement references five separate modifications tied to specific manufacturer service bulletins (with permitted later revisions), requiring operators to obtain and follow multiple documents.","Fixed compliance deadline (prior to 10 August 1990) imposes scheduling pressure and potential aircraft downtime.","Amendment added an additional required modification, expanding the original scope of work.","Reference to Transport Canada AD CF 85‑06 R2 introduces an international conformity check for operators and maintainers.","Compliance entails costs for parts, labour and record-keeping borne by operators; limited regulatory discretion once AD is issued."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier (De Havilland) DHC‑8 aeroplanes to install manufacturer-specified modifications to reduce the risk of lightning transient damage to electronic engine control units. Work must follow the applicable service bulletins and be completed by 10 August 1990.\n\nThe rule applies to all DHC‑8 owners/operators, who must pay for, schedule and document the modifications; this creates parts, labour and downtime costs and requires following the specified maintenance instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-7-amdt-1-electronic-engine-control-units","history":"/api/acts/ad-dhc-8-7-amdt-1-electronic-engine-control-units/history","analysis":"/api/acts/ad-dhc-8-7-amdt-1-electronic-engine-control-units/analysis","conflicts":"/api/acts/ad-dhc-8-7-amdt-1-electronic-engine-control-units/conflicts","importantCases":"/api/acts/ad-dhc-8-7-amdt-1-electronic-engine-control-units/important-cases","documents":"/api/acts/ad-dhc-8-7-amdt-1-electronic-engine-control-units/documents"}}