{"id":"F2006B09228","name":"AD/DHC-8/70 - Fuel Tank Vent and Scavenge Line Couplings","slug":"ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53107,"registerId":"commonwealth-F2006B09228-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/DHC-8/70 Fuel Tank Vent and Scavenge ","sectionType":"part","heading":"AD/DHC-8/70 Fuel Tank Vent and Scavenge Line Couplings 7/2000","content":"# AD/DHC-8/70 Fuel Tank Vent and Scavenge Line Couplings 7/2000\n\nApplicability: DHC-8 aircraft Model 102, 103, 106, 201, 202, 301, 311, 314 and 315, serial numbers\n\n003 to 540 inclusive.\n\nRequirement: 1. Inspect Wiggins fuel couplings in accordance with the Accomplishment Instructions in Bombardier Alert Service Bulletin A8-28-32 dated 14 January 2000.\n\n2. Rework stiffener on upper access panel 624AT in accordance with the Accomplishment Instructions in Bombardier Alert Service Bulletin A8-28-32 dated 14 January 2000.\n\nNote: Transport Canada AD CF-2000-05 refers.\n\nCompliance: 1. Unless previously accomplished, within 90 days time in service after the effective date of this Directive.\n\n2. Unless previously accomplished, at the next convenient maintenance opportunity but not later than the next “C” check or 5,000 hours flight time, whichever occurs first, after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 13 July 2000.\n\nBackground: Reports from operators indicate that some of the right wing fuel couplings on the fuel and scavenge lines may have been assembled incorrectly, (nut facing outboard). This can result in fouling between the coupling nut and the stiffener located on the lower surface of the 624AT access panel. This contact is a potential safety concern in the event of a lightning strike.\n\n![](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 19 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.","sortOrder":1}],"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":3,"scope_assessment":{"changed":false,"description":"The directive sets a narrow, specific scope: named DHC-8 models and serial numbers and two mandated actions (inspect couplings; rework 624AT stiffener) with fixed compliance deadlines. The AD text contains no indication of any expansion or subsequent amendment to broaden applicability or requirements; it became effective 13 July 2000 and cites Bombardier ASB A8-28-32 as the procedural source."},"complexity_factors":["Limited applicability to specific DHC-8 models and serial numbers (Applicability).","Technical reliance on Bombardier Alert Service Bulletin A8-28-32 for inspection and rework procedures (Requirement).","Two distinct compliance timeframes: 90 days for inspection, and by next C-check or 5,000 hours for rework (Compliance).","Safety rationale tied to potential lightning-strike interaction between coupling nut and panel stiffener (Background).","Regulatory authority and discretionary issuance by CASA delegate under CAR 1998 subreg 39.1(1) (preamble).","Operator cost and labour burden to perform inspection and structural rework (implied by Requirement and Compliance).","Cross-reference to Transport Canada AD CF-2000-05 introduces multi-jurisdictional alignment (Note)."],"plain_english_summary":"Requires operators of certain DHC-8 aircraft (Models 102–315, serials 003–540) to inspect Wiggins fuel couplings and rework the 624AT access-panel stiffener per Bombardier Alert Service Bulletin A8-28-32 to prevent coupling nut contact that could be hazardous during lightning strikes. CASA's delegate issued the AD under CAR 1998 subreg 39.1(1); compliance deadlines are 90 days for inspection and by next C-check or 5,000 flight hours for the rework. Operators bear the compliance costs and must follow the manufacturer's instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original, narrow scope: addressing a specific manufacturing/assembly defect in fuel line couplings on specific DHC-8 aircraft models. The document shows no evidence of scope creep — it targets exactly the unsafe condition described in the background (incorrectly oriented coupling nuts creating lightning strike hazards) and mandates precisely the corrective actions recommended by the manufacturer."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 substantive requirements with clear, sequential numbering","Single applicability section with straightforward aircraft model/serial number criteria","Compliance deadlines use standard aviation maintenance terminology ('C' check, flight hours) but are clearly defined","No nested exceptions or conditional logic — requirements apply uniformly to all affected aircraft","Only one cross-reference (to Transport Canada AD CF-2000-05, noted for information only)","Background section provides clear, plain-language explanation of the safety issue","No defined terms section — technical terms (Wiggins couplings, stiffener, access panel) are industry-standard or explained by context"],"plain_english_summary":"Owners/operators of specific Bombardier DHC-8 (Dash 8) airframes (s/n 003–540, models 102–315) must inspect Wiggins fuel couplings and rework an access-panel stiffener. The couplings’ nut can face outboard and rub the stiffener, creating a lightning-spark risk near fuel vapour. Inspection is required within 90 days; stiffener rework must be done at the next maintenance opportunity or by the next C‑check/5,000 flight hours."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings","history":"/api/acts/ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings/history","analysis":"/api/acts/ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings/analysis","conflicts":"/api/acts/ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings/conflicts","importantCases":"/api/acts/ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings/important-cases","documents":"/api/acts/ad-dhc-8-70-fuel-tank-vent-and-scavenge-line-couplings/documents"}}