AD 70-04-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744 and 745D Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744 and 745D Airplanes |
Unsafe Condition
Failure of the automatic feathering system's micro-switch actuating levers could lead to improper arming during cruise, turbine overheat, or propeller separation from the engine due to engine annulus gear failure.
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Required Actions
Replace micro-switch actuating levers and set the 'arm' setting of the automatic feathering system throttle micro-switches per British Aircraft Corporation Bulletin D.2207, 4th Issue (Jan 31, 1969) or later ARB/FAA-approved equivalent.
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Compliance Time
within the next 450 hours' time in service after the effective date of this AD
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount 744 and Viscount 745D airplanes
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Federal Register Abstract
Automatic Feathering System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-04-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-04-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744 and 745D Airplanes Subject: Automatic Feathering System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/21/1970 Make: Vickers-Armstrongs (Aircraft Limited) Model: Viscount 744 | Viscount 745D Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-04-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-942 AD NUMBER: 70-04-05 SUBJECT HEADING: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744 and 745D Airplanes ACTION: SUMMARY: DATES: Effective March 21, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-04-05 BRITISH AIRCRAFT CORPORATION: Amendment 39-942. Applies to BAC Viscount Model 744 and 745D airplanes. Compliance is required within the next 450 hours' time in service after the effective date of this AD, unless already accomplished. To assure that the automatic feathering system is armed properly during cruise, to protect against turbine overheat and to protect against separation of the propeller from the engine in the event of engine annulus gear failure, replace micro-switch actuating levers and set the "arm" setting of the automatic feathering system throttle micro-switches in accordance with British Aircraft Corporation, Viscount 700 series aircraft, Bulletin for Modification No. D.2207, 4th Issue, dated January 31, 1969, or later ARB-approved issue or an FAA-approved equivalent. This amendment becomes effective March 21, 1970. FOOTER:
Document Text
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AD Final Rules - DRS_70-04-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-04-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744 and 745D Airplanes Subject: Automatic Feathering System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/21/1970 Make: Vickers-Armstrongs (Aircraft Limited) Model: Viscount 744 | Viscount 745D Product Type: Aircraft Product Subtype: Large 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: 70-04-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-942 AD NUMBER: 70-04-05 SUBJECT HEADING: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744 and 745D Airplanes ACTION: SUMMARY: DATES: Effective March 21, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-04-05 BRITISH AIRCRAFT CORPORATION: Amendment 39-942. Applies to BAC Viscount Model 744 and 745D airplanes. Compliance is required within the next 450 hours' time in service after the effective date of this AD, unless already accomplished. To assure that the automatic feathering system is armed properly during cruise, to protect against turbine overheat and to protect against separation of the propeller from the engine in the event of engine annulus gear failure, replace micro-switch actuating levers and set the "arm" setting of the automatic feathering system throttle micro-switches in accordance with British Aircraft Corporation, Viscount 700 series aircraft, Bulletin for Modification No. D.2207, 4th Issue, dated January 31, 1969, or later ARB-approved issue or an FAA-approved equivalent. This amendment becomes effective March 21, 1970. FOOTER:
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Retrieved: Apr 8, 2026
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