{"id":"F2006B09189","name":"AD/DHC-8/33 - Electronic Engine Control Cable Harness Lightning Protection","slug":"ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52985,"registerId":"commonwealth-F2006B09189-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-8/33 - Electronic Engine Control Cable Harness Lightning Protection","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-8/33 Electronic Engine Control Cable Harness Lightning Protection\n\n  \n8/94\n\nDM\n\nApplicability: Models 102, 103 and 106, serial numbers 3 to 369 inclusive, and Models 301, 311\n\nand 314, serial numbers 100 to 370 inclusive.\n\nRequirement: Action in accordance with Bombardier Regional Aircraft Division de Havilland Dash 8 Service Bulletin S.B. 8-73-18 dated 29 April 1994 or SB 8-73-19 dated 29 April\n\n1994 as applicable.\n\nNote: Transport Canada AD CF-94-09 dated 6 May 1994 refers.\n\nCompliance: Prior to 28 August 1994.\n\nBackground: AD/DHC-8/7 Amdt 1 required the incorporation of five modifications designed to minimise the danger of lightning transient-induced damage to the electronic engine control units. Transport Canada have advised, that despite the required modifications being incorporated a DHC-8 aircraft experienced an engine flameout following a lightning strike, subsequent investigation revealed several engine control cable harness shields were not grounded in accordance with the modifications. This Directive requires a one time inspection to verify the integrity of the engine control cable harness shield grounds and, if necessary, the rework of any grounds that do not satisfy the resistance measurement specifications.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive addressing a specific technical defect identified through incident investigation. It has not expanded beyond its original purpose of ensuring lightning protection integrity on specific DHC-8 aircraft models."},"complexity_factors":["Single, specific technical requirement with clear reference to external manufacturer documents (Service Bulletins 8-73-18 and 8-73-19)","Limited applicability — only 6 specific aircraft models with defined serial number ranges","No defined terms section or interpretation provisions","Simple conditional structure: inspect, and if non-compliant, repair","Single compliance deadline with no exceptions or alternative compliance methods","Short document (approximately 200 words) with straightforward background explanation","Only cross-reference is to related Canadian aviation authority directive for context"],"plain_english_summary":"This AD requires owners/operators of early-production Bombardier DHC‑8 (Dash 8) aircraft (specific models/serials pre‑S/N ~370) to inspect engine‑control cable shielding and its grounding and to fix any defects, following Bombardier April 1994 service instructions. \n\nIt responds to a lightning-induced engine flameout where shielding wasn’t properly grounded; the inspection/repairs are one‑time and must be done by 28 August 1994."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This directive expands the earlier corrective programme (AD/DHC‑8/7) by adding a mandatory one‑time inspection and corrective rework specifically to verify and restore engine control cable harness shield grounding where prior modifications were not implemented or did not meet resistance specifications (Requirement; Background). It therefore adds a verification and remediation step to the earlier modification mandate."},"complexity_factors":["Narrow applicability to specific models and serial ranges (Applicability: Models 102, 103, 106 s/n 3–369; Models 301, 311, 314 s/n 100–370).","Mandates work to be done in accordance with manufacturer service bulletins (Requirement: Bombardier S.B. 8‑73‑18 or 8‑73‑19).","Technical verification and repair standard: inspection of shield grounds and rework where resistance measurements fail to meet specified limits (Background).","Fixed, one‑time compliance deadline (Compliance: prior to 28 August 1994) creating scheduling pressure for operators.","Built on prior regulatory action and foreign authority reference (Background: AD/DHC‑8/7 Amdt 1; Note: Transport Canada AD CF‑94‑09).","Predictable enforcement path and limited regulator discretion — mandatory inspection and corrective action rather than ongoing monitoring."],"plain_english_summary":"This airworthiness directive requires operators of specified Bombardier (De Havilland) DHC‑8 aeroplanes (particular models and serial numbers) to carry out a one‑time inspection of the electronic engine control cable harness shield grounds and to rework any grounds that do not meet the resistance specifications, following Bombardier Service Bulletin S.B. 8‑73‑18 or S.B. 8‑73‑19. Compliance was required by 28 August 1994.\n\nIt affects the listed aircraft owners/operators by imposing a mandatory inspection and corrective‑maintenance obligation after an incident showed previously mandated modifications had not been correctly grounded."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection","history":"/api/acts/ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection/history","analysis":"/api/acts/ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection/analysis","conflicts":"/api/acts/ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection/conflicts","importantCases":"/api/acts/ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection/important-cases","documents":"/api/acts/ad-dhc-8-33-electronic-engine-control-cable-harness-lightning-protection/documents"}}