AD 72-18-09
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 744 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 745D | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes |
| aircraft | Vickers-Armstrongs (Aircraft Limited) | Viscount 810 | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes |
Unsafe Condition
Control rods, electrical systems, and structure in the underfloor electrical system bay are vulnerable to fire and overheat damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace control rods with specified part numbers, replace electrical panel guard covers with glasscloth resin laminate or equivalent, and install protective surfaces/panels on floor panels as per the listed modifications.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 250 hours' time in service after the effective date of this AD
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Affected Aircraft
Vickers-Armstrongs (Aircraft Limited) Models Viscount 744, 745D, and 810 with nickel-cadmium batteries; Models Viscount 744, 745D, and 810 with lead acid batteries have compliance within 1500 hours' time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Control Rods And Electrical Systems
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_72-18-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-18-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes Subject: Control Rods And Electrical Systems Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/06/1972 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Model: Viscount 744 | Viscount 745D | Viscount 810 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 72-18-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1514 AD NUMBER: 72-18-09 SUBJECT HEADING: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes ACTION: SUMMARY: DATES: Effective September 6, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-18-09 BRITISH AIRCRAFT CORPORATION: Amendment 39-1514. Applies to Vickers Viscount, Model 744, 745D and 810 airplanes. Compliance is required as indicated. To reduce the vulnerability of control rods, electrical systems, and structure located in the underfloor electrical system bay to fire and overheat damage, accomplish the following: (a) For Models 744, 745D and 810 airplanes with nickel-cadmium batteries in the primary electrical system, within the next 250 hours' time in service after the effective date of this AD, unless already accomplished, replace the control rods in accordance with paragraph (e) and replace the electrical panel guard covers in accordance with paragraph (f). (b) For Models 744 and 745D airplanes with nickel-cadmium batteries in the primary electrical system, within the next 250 hours' time in service after the effective date of this AD, unless already accomplished, install protective surfaces on the lower surface of floor panels in accordance with paragraph (g). (c) For Models 744, 745D and 810 airplanes with lead acid batteries in the primary electrical system within the next 1500 hours' time in service after the effective date of this AD, unless already accomplished, replace the control rods in accordance with paragraph (e) and replace the electrical panel guard covers in accordance with paragraph (f). (d) For Models 744 and 745D airplanes with lead acid batteries in the primary electrical system, within the next 1500 hours' time in service after the effective date of this AD, unless already accomplished, install protective panels on the lower surface of floor panels in accordance with paragraph (g). (e) Replace applicable control rods listed in Column A with the control rods listed in Column B: (1) For Models 744 and 745D airplanes : COLUMN A Remove Part Numbers COLUMN B Install Part Numbers Aileron 70133 Sht. 97 70133 Sht. 231 70133 Sht. 185 70133 Sht. 235 Elevator 70133 Sht. 93 70133 Sht. 227 70133 Sht. 95 70133 Sht. 229 Rudder 70133 Sht. 93 70133 Sht. 227 70133 Sht. 95 70133 Sht. 229 (2) For Model 810 airplanes: COLUMN A Remove Part Numbers COLUMN B Install Part Numbers Aileron 70133 Sht. 97 70133 Sht. 231 80233 Sht. 31 80233 Sht. 391 Elevator 70133 Sht. 93 70133 Sht. 227 70133 Sht. 153 70133 Sht. 233 Rudder 70133 Sht. 93 70133 Sht. 227 70133 Sht. 153 70133 Sht. 233 (f) Replace Perspex electrical panel covers listed in Column A with glasscloth resin laminate covers listed in Column C, or FAA-approved equivalent covers. (1) For Models 744 and 745D airplanes: COLUMN A COLUMN B COLUMN C Remove Part Numbers Location Install Part Numbers 72436-1903 74536-315 Over fuses at top of power panel "K" At cut-out for control rods at top of power panel "J" 72436 Sht. 735 74536-1481 72436-663 Over wing root panel "H" 72436 Sht. 737 72436-665 Over wing rootpanel "G" 72436 Sht. 739 (2) For Model 810 airplanes: COLUMN A COLUMN B COLUMN C Remove Part Numbers Location Install Part Numbers 81236-2713 Over wing root panel "H" 81236 Sht. 147 81236-2715 Over wing root panel "G" 81236 Sht. 149 (g) Install 2024 aluminum alloy sheeting with a minimum thickness of .028 inches, or an FAA-approved equivalent fire resistant material, on the lower surface of all floor panels made of plywood or material with similar fire resistant characteristics, between fuselage stations 357.85 and 414.00. (British Aircraft Corporation Bulletins for Modification D.3249 (700 Series) and FG.2127 (800/810 Series) cover this same subject). This amendment becomes effective 6 September 1972. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_72-18-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-18-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes Subject: Control Rods And Electrical Systems Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/06/1972 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: 72-18-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1514 AD NUMBER: 72-18-09 SUBJECT HEADING: Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model 744, 745D and 810 Airplanes ACTION: SUMMARY: DATES: Effective September 6, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-18-09 BRITISH AIRCRAFT CORPORATION: Amendment 39-1514. Applies to Vickers Viscount, Model 744, 745D and 810 airplanes. Compliance is required as indicated. To reduce the vulnerability of control rods, electrical systems, and structure located in the underfloor electrical system bay to fire and overheat damage, accomplish the following: (a) For Models 744, 745D and 810 airplanes with nickel-cadmium batteries in the primary electrical system, within the next 250 hours' time in service after the effective date of this AD, unless already accomplished, replace the control rods in accordance with paragraph (e) and replace the electrical panel guard covers in accordance with paragraph (f). (b) For Models 744 and 745D airplanes with nickel-cadmium batteries in the primary electrical system, within the next 250 hours' time in service after the effective date of this AD, unless already accomplished, install protective surfaces on the lower surface of floor panels in accordance with paragraph (g). (c) For Models 744, 745D and 810 airplanes with lead acid batteries in the primary electrical system within the next 1500 hours' time in service after the effective date of this AD, unless already accomplished, replace the control rods in accordance with paragraph (e) and replace the electrical panel guard covers in accordance with paragraph (f). (d) For Models 744 and 745D airplanes with lead acid batteries in the primary electrical system, within the next 1500 hours' time in service after the effective date of this AD, unless already accomplished, install protective panels on the lower surface of floor panels in accordance with paragraph (g). (e) Replace applicable control rods listed in Column A with the control rods listed in Column B: (1) For Models 744 and 745D airplanes : COLUMN A Remove Part Numbers COLUMN B Install Part Numbers Aileron 70133 Sht. 97 70133 Sht. 231 70133 Sht. 185 70133 Sht. 235 Elevator 70133 Sht. 93 70133 Sht. 227 70133 Sht. 95 70133 Sht. 229 Rudder 70133 Sht. 93 70133 Sht. 227 70133 Sht. 95 70133 Sht. 229 (2) For Model 810 airplanes: COLUMN A Remove Part Numbers COLUMN B Install Part Numbers Aileron 70133 Sht. 97 70133 Sht. 231 80233 Sht. 31 80233 Sht. 391 Elevator 70133 Sht. 93 70133 Sht. 227 70133 Sht. 153 70133 Sht. 233 Rudder 70133 Sht. 93 70133 Sht. 227 70133 Sht. 153 70133 Sht. 233 (f) Replace Perspex electrical panel covers listed in Column A with glasscloth resin laminate covers listed in Column C, or FAA-approved equivalent covers. (1) For Models 744 and 745D airplanes: COLUMN A COLUMN B COLUMN C Remove Part Numbers Location Install Part Numbers 72436-1903 74536-315 Over fuses at top of power panel "K" At cut-out for control rods at top of power panel "J" 72436 Sht. 735 74536-1481 72436-663 Over wing root panel "H" 72436 Sht. 737 72436-665 Over wing rootpanel "G" 72436 Sht. 739 (2) For Model 810 airplanes: COLUMN A COLUMN B COLUMN C Remove Part Numbers Location Install Part Numbers 81236-2713 Over wing root panel "H" 81236 Sht. 147 81236-2715 Over wing root panel "G" 81236 Sht. 149 (g) Install 2024 aluminum alloy sheeting with a minimum thickness of .028 inches, or an FAA-approved equivalent fire resistant material, on the lower surface of all floor panels made of plywood or material with similar fire resistant characteristics, between fuselage stations 357.85 and 414.00. (British Aircraft Corporation Bulletins for Modification D.3249 (700 Series) and FG.2127 (800/810 Series) cover this same subject). This amendment becomes effective 6 September 1972. FOOTER:
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Retrieved: Apr 8, 2026
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