AD 74-17-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; de Havilland Model DHC-2 (Mk I) Beaver Airplane |
Unsafe Condition
Carbon monoxide entering the airplane cabin due to holes, cracks, flaking, or weld separations in the intensifier tube cabin heater system or heater jackets and exhaust pipe.
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Required Actions
Inspect the intensifier tube and exhaust pipe or heater jackets for holes, cracks, flaking, or weld separations. Replace or repair any defective parts using AC 43.13-1 or FAA-approved methods. Repeat inspections every 110 hours in service.
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Compliance Time
within the next 110 hours in service after the last inspection pursuant to this directive and thereafter at intervals not to exceed 110 hours in service from a preceding inspection
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Affected Aircraft
de Havilland Model DHC-2 (Mk I) Beaver Airplane with intensifier tube cabin heater system or heater jackets
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Federal Register Abstract
Cabin Heater Inspection
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-17-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-17-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; de Havilland Model DHC-2 (Mk I) Beaver Airplane Subject: Cabin Heater Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/12/1974 Make: Viking Air Limited Model: DHC-2 Mk.I Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-17-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1914 AD NUMBER: 74-17-03 SUBJECT HEADING: Airworthiness Directives; de Havilland Model DHC-2 (Mk I) Beaver Airplane ACTION: SUMMARY: DATES: Effective August 12, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-17-03 DEHAVILLAND: Amendment 39-1914. Applies to Model DHC-2 (Mk I) Beaver Airplane. Compliance required within the next 110 hours in service after the last inspection pursuant to this directive and thereafter at intervals not to exceed 110 hours in service from a preceding inspection. To prevent carbon monoxide from entering the airplane cabin, accomplish the following: (a) For airplanes using the intensifier tube cabin heater system, remove the tube and perform a visual inspection on both the intensifier tube and the exhaust pipe for any holes, cracks, flaking or weld separations. (b) For airplanes using heater jackets, remove the jacket and perform the same inspection as in (a) above. Replace or repair parts found to have any holes, cracks flaking or weld separations. Make welding repairs in accordance with Advisory Circular AC 43.13-1 or an FAA approved equivalent. Upon submission of substantiation data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, Eastern Region, may adjust the repetitive inspection intervals specified in this AD. This Directive supersedes Airworthiness Directive 57-13-02. This amendment is effective August 12, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-17-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-17-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; de Havilland Model DHC-2 (Mk I) Beaver Airplane Subject: Cabin Heater Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/12/1974 Make: Viking Air Limited Model: DHC-2 Mk.I Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-17-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1914 AD NUMBER: 74-17-03 SUBJECT HEADING: Airworthiness Directives; de Havilland Model DHC-2 (Mk I) Beaver Airplane ACTION: SUMMARY: DATES: Effective August 12, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-17-03 DEHAVILLAND: Amendment 39-1914. Applies to Model DHC-2 (Mk I) Beaver Airplane. Compliance required within the next 110 hours in service after the last inspection pursuant to this directive and thereafter at intervals not to exceed 110 hours in service from a preceding inspection. To prevent carbon monoxide from entering the airplane cabin, accomplish the following: (a) For airplanes using the intensifier tube cabin heater system, remove the tube and perform a visual inspection on both the intensifier tube and the exhaust pipe for any holes, cracks, flaking or weld separations. (b) For airplanes using heater jackets, remove the jacket and perform the same inspection as in (a) above. Replace or repair parts found to have any holes, cracks flaking or weld separations. Make welding repairs in accordance with Advisory Circular AC 43.13-1 or an FAA approved equivalent. Upon submission of substantiation data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, Eastern Region, may adjust the repetitive inspection intervals specified in this AD. This Directive supersedes Airworthiness Directive 57-13-02. This amendment is effective August 12, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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