{"id":"F2011L01721","name":"AD/DHC-1/43 Amdt 1 - Engine Primer Pipe and Fuel Tank Selector Guide - Modifications, Inspections and Replacements","slug":"ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":126207,"registerId":"commonwealth-F2011L01721-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"De Havilland DHC-1 (Chipmunk) Series Aer","sectionType":"division","heading":"De Havilland DHC-1 (Chipmunk) Series Aeroplanes","content":"### De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n| AD/DHC-1/43 Amdt 1 | Engine Primer Pipe and Fuel Tank Selector Guide - Modifications, Inspections and Replacements | 17/2011 |\n| ------------------ | --------------------------------------------------------------------------------------------- | ------- |\n\n| Applicability: | All Canadian production DHC-1 aircraft as specified in the requirement document.                                                                                                                                                |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Carry out the modifications, inspections and replacements in accordance with Transport Canada Airworthiness Directive CF-51-05.Note: De Havilland Aircraft of Canada Limited Technical News Sheets C-20, C-21, and C(R)1 refer. |\n| Compliance:    | Within 6 months after the effective date unless previously accomplished.                                                                                                                                                        |\n|                | This Amendment becomes effective on 26 August 2011.                                                                                                                                                                             |\n| Background:    | Modifications relating to the fuel tank selector guide and engine primer pipes have been mandated by Transport Canada.Amendment 1 of this directive reduces the applicability of the directive to Canadian Chipmunks only.      |\n\n![](image.001.png)  \nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n23 August 2011","sortOrder":0},{"sectionNumber":"AD/DHC-1/43 Amdt 1","sectionType":"part","heading":"AD/DHC-1/43 Amdt 1","content":"## AD/DHC-1/43 Amdt 1","sortOrder":1},{"sectionNumber":"Engine Primer Pipe and Fuel Tank Selecto","sectionType":"part","heading":"Engine Primer Pipe and Fuel Tank Selector Guide - Modifications, Inspections and Replacements","content":"## Engine Primer Pipe and Fuel Tank Selector Guide - Modifications, Inspections and Replacements","sortOrder":2},{"sectionNumber":"17/2011","sectionType":"part","heading":"17/2011","content":"## 17/2011","sortOrder":3}],"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":"Amendment 1 narrows the directive's scope: originally broader, it now applies only to Canadian-production De Havilland DHC-1 (Chipmunk) aircraft. (Background: \"Amendment 1 of this directive reduces the applicability of the directive to Canadian Chipmunks only.\"; Applicability: \"All Canadian production DHC-1 aircraft...\")"},"complexity_factors":["Cross-jurisdictional reliance: instructs compliance with Transport Canada AD CF-51-05 rather than reproducing technical requirements locally (Requirement).","External technical references: refers to De Havilland Technical News Sheets C-20, C-21 and C(R)1 for implementation detail (Requirement/Note).","Scope limitation: Amendment 1 reduces applicability to Canadian production DHC-1 aircraft only, changing who must comply (Background/Applicability).","Fixed compliance window: a statutory six-month deadline from the effective date creates scheduling and logistical pressure for operators (Compliance).","Enforcement and administrative discretion: CASA (via its delegate) issues the directive and will oversee compliance, implying administrative monitoring and potential verification actions (signature/authority).","Operator cost and supply effects: required modifications, inspections and replacements imply direct out-of-pocket costs and possible parts/service sourcing constraints for owners/operators (Requirement/Compliance)."],"plain_english_summary":"This amendment requires owners/operators of Canadian-production De Havilland DHC-1 (Chipmunk) aircraft to carry out specified modifications, inspections and replacements to the engine primer pipe and fuel tank selector guide by following Transport Canada Airworthiness Directive CF-51-05. Compliance must be completed within six months of the effective date (26 Aug 2011).\n\nOwners/operators pay for the work and parts, CASA enforces compliance, and the amendment narrows applicability to Canadian-built Chipmunks only while citing De Havilland Technical News Sheets C-20, C-21 and C(R)1."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 1 explicitly reduces the scope from all DHC-1 Chipmunks to only Canadian production models. The original AD/DHC-1/43 likely applied more broadly, but this amendment narrows applicability based on manufacturing origin."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (Canadian production)","Single cross-reference to external document (Transport Canada AD CF-51-05)","Simple compliance deadline (6 months from effective date)","No nested conditions, exceptions, or sub-delegations","Straightforward amendment history (merely narrows applicability)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners and operators of Canadian-built De Havilland DHC-1 Chipmunk aircraft to carry out modifications, inspections and replacements on engine primer pipes and fuel tank selector guides per Transport Canada AD CF-51-05 to prevent fuel leaks, engine failure or fire. Compliance was required within six months of 26 August 2011.\n\nAmendment 1 narrows the AD’s scope so it applies only to Canadian-manufactured Chipmunks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep","history":"/api/acts/ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep/history","analysis":"/api/acts/ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep/analysis","conflicts":"/api/acts/ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep/conflicts","importantCases":"/api/acts/ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep/important-cases","documents":"/api/acts/ad-dhc-1-43-amdt-1-engine-primer-pipe-and-fuel-tank-selector-guide-modifications-inspections-and-rep/documents"}}