AD 70-08-04
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes |
Unsafe Condition
The obsolete cabin blower drive quill may fail, leading to loss of cabin pressurization or engine power.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the obsolete cabin blower drive quill with a serviceable or reworked unit per specified Dowty Rotol Service Bulletins or FAA-approved equivalent. Use designated replacement part numbers for models 744, 745D, and 810.
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Compliance Time
within the next 750 hours' time in service after the effective date of this AD
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Viscount Models 744, 745D, and 810 series airplanes
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Federal Register Abstract
Cabin Blower Drive Quill
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-08-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-08-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes Subject: Cabin Blower Drive Quill Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/14/1970 Make: Vickers-Armstrongs (Aircraft Limited) Model: Viscount 744 | Viscount 745D | Viscount 810 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-08-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-975 AD NUMBER: 70-08-04 SUBJECT HEADING: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes ACTION: SUMMARY: DATES: Effective May 14, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-08-04 BRITISH AIRCRAFT CORPORATION: Amdt. 39-975. Applies to Viscount Models 744, 745D, and 810 series airplanes. Within the next 750 hours' time in service after the effective date of this AD, unless already accomplished, replace the obsolete cabin blower (supercharger) drive quill with a serviceable or reworked drive quill in accordance with Dowty Rotol Service Bulletin No. 83-407, Revision 2, dated August 1969, for models 744 and 745D series airplanes; or Dowty Rotol Service Bulletin No. 83-378, dated August 1968, for Model 810 series airplanes; or an FAA- approved equivalent as follows: Obsolete Drive Quill P/N Replacement Drive Quill P/N 602206000 (Models 744 and 745D) 602206002 G28165 (Models 744 and 745D) 601017004 G2575 (Model 810) G28302 (British Aircraft Corporation Viscount Bulletins for Modification Nos. D3237 and G.2083 cover this same subject.) This amendment becomes effective May 14, 1970. FOOTER:
Document Text
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AD Final Rules - DRS_70-08-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-08-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes Subject: Cabin Blower Drive Quill Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/14/1970 Make: Vickers-Armstrongs (Aircraft Limited) Model: Viscount 744 | Viscount 745D | Viscount 810 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: 70-08-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-975 AD NUMBER: 70-08-04 SUBJECT HEADING: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models 744, 745D, and 810 Series Airplanes ACTION: SUMMARY: DATES: Effective May 14, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-08-04 BRITISH AIRCRAFT CORPORATION: Amdt. 39-975. Applies to Viscount Models 744, 745D, and 810 series airplanes. Within the next 750 hours' time in service after the effective date of this AD, unless already accomplished, replace the obsolete cabin blower (supercharger) drive quill with a serviceable or reworked drive quill in accordance with Dowty Rotol Service Bulletin No. 83-407, Revision 2, dated August 1969, for models 744 and 745D series airplanes; or Dowty Rotol Service Bulletin No. 83-378, dated August 1968, for Model 810 series airplanes; or an FAA- approved equivalent as follows: Obsolete Drive Quill P/N Replacement Drive Quill P/N 602206000 (Models 744 and 745D) 602206002 G28165 (Models 744 and 745D) 601017004 G2575 (Model 810) G28302 (British Aircraft Corporation Viscount Bulletins for Modification Nos. D3237 and G.2083 cover this same subject.) This amendment becomes effective May 14, 1970. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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