{"id":"F2006L00753","name":"AD/DHC-8/116 - Fuel Tank Lightning Protection","slug":"ad-dhc-8-116-fuel-tank-lightning-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136776,"registerId":"commonwealth-F2006L00753-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Boeing Canada/De Havilland) ","sectionType":"division","heading":"Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","content":"### Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\n| AD/DHC-8/116 | Fuel Tank Lightning Protection | 4/2006 |\n| ------------ | ------------------------------ | ------ |\n\n| Applicability: | DHC-8 Series 400 aeroplanes, serial numbers (S/N) 4005, 4006, 4008 through 4010, 4012 through 4015 and 4018 through 4040.                                                                                                                                                                                                                                                                                                                               |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. For aeroplanes S/N 4005, 4006, 4008 through 4010, 4012 through 4015 and 4018 through 4040 - If not previously accomplished, incorporate ModSum4-113299. Approved instructions for incorporating ModSum 4-113299 are detailed in the Accomplishment Instructions of Bombardier Alert Service Bulletin A84-28-02 dated 7 February 2001 or later revisions approved by the Director, Aircraft Certification, Transport Canada.                          |\n|                | 2. For aircraft serial numbers 4006, 4008, 4012 through 4015 and 4018 through 4027 - If not previously accomplished, incorporate ModSum 4-113192. Approved instructions for incorporating ModSum 4-113192, are detailed in the Accomplishment Instructions of Bombardier Service Bulletin 84-28-01 dated19 December 2000 or later revisions approved by the Director, Aircraft Certification, Transport Canada.                                         |\n|                | Note: Transport Canada AD CF-2001-14 refers.                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Compliance:    | For Requirements 1 and 2 - Within 30 days after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                   |\n|                | This Airworthiness Directive becomes effective on 13 April 2006.                                                                                                                                                                                                                                                                                                                                                                                        |\n| Background:    | Transport Canada has advised that two potential problems have been identified with the wing fuel tanks which, if not corrected, could compromise the lightning protection of the aircraft. The first issue is the possible lack of clearance between the fuel tank vent line and rib structures at 20 wing stations (10 in each wing). The second issue is a potential fouling condition between #1, #2 and #5 fuel probes and the wing tank structure. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n2 March 2006","sortOrder":0},{"sectionNumber":"AD/DHC-8/116","sectionType":"part","heading":"AD/DHC-8/116","content":"## AD/DHC-8/116","sortOrder":1},{"sectionNumber":"Fuel Tank Lightning Protection","sectionType":"part","heading":"Fuel Tank Lightning Protection","content":"## Fuel Tank Lightning Protection","sortOrder":2},{"sectionNumber":"4/2006","sectionType":"part","heading":"4/2006","content":"## 4/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive focused specifically on fuel tank lightning protection defects. It has not expanded beyond its original safety purpose."},"complexity_factors":["Highly specific applicability limited to 28 specific aircraft serial numbers","Two distinct modification requirements (ModSum 4-113299 and ModSum 4-113192) with overlapping but not identical serial number ranges","References to external technical documents (Bombardier Service Bulletins) that contain the actual implementation instructions","Cross-reference to Canadian aviation regulation (Transport Canada AD CF-2001-14)","Conditional language ('If not previously accomplished') requiring operators to check maintenance history"],"plain_english_summary":"This AD orders owners/operators of certain Bombardier DHC‑8 Series 400 aircraft (specific serial numbers listed in the directive) to install two mandated wing fuel‑tank modifications within 30 days.  \n\nIt fixes two defects—vent lines positioned too close to wing ribs and fuel probes contacting tank structure—that could let lightning ignite fuel vapours. Aircraft may not legally fly until the specified Bombardier repair instructions are completed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope has not changed from the Directive's stated corrective intent: it targets specified DHC-8-400 serial numbers and mandates incorporation of two ModSums per Bombardier service instructions (consistent with Transport Canada AD CF-2001-14). It implements corrective work to address the two identified lightning-protection issues and fixes a 30-day compliance deadline, matching the original remedial purpose described in the Background."},"complexity_factors":["Multiple, non-contiguous serial-number subsets determine applicability (Applicability).","Two distinct modification packages apply to overlapping but different serial-number groups (Requirement 1 and Requirement 2).","Mandated use of specific Bombardier service/alert bulletins and any later revisions only if approved by the Director, Aircraft Certification, Transport Canada (Requirement wording).","Short compliance window: work must be done within 30 days of the directive's effective date (Compliance).","Work involves physical modification of fuel-tank/vent/probe arrangements, implying maintenance/engineering effort and possible aircraft downtime (Background + Requirement).","Reference to an existing Transport Canada AD (CF-2001-14) creates regulatory cross-reference obligations (Note)."],"plain_english_summary":"This Airworthiness Directive requires specified Bombardier DHC-8 Series 400 aeroplanes (listed serial numbers) to incorporate two modification packages (ModSum 4-113299 and ModSum 4-113192) using approved Bombardier/Transport Canada service instructions to correct potential wing fuel-tank clearance and fuel-probe fouling that could affect lightning protection. Compliance is mandatory within 30 days. The stated purpose is safety; mechanically it forces operators to carry out approved retrofit work on a defined subset of aircraft, creating immediate maintenance costs and administrative tracking obligations."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-116-fuel-tank-lightning-protection","history":"/api/acts/ad-dhc-8-116-fuel-tank-lightning-protection/history","analysis":"/api/acts/ad-dhc-8-116-fuel-tank-lightning-protection/analysis","conflicts":"/api/acts/ad-dhc-8-116-fuel-tank-lightning-protection/conflicts","importantCases":"/api/acts/ad-dhc-8-116-fuel-tank-lightning-protection/important-cases","documents":"/api/acts/ad-dhc-8-116-fuel-tank-lightning-protection/documents"}}