- Effective
- March 23, 1970
- Models
- Viscount 744, Viscount 745D, Viscount 810
- Data sheet
- TCDSA-814
- Product
- Aircraft · Large airplane
- Amendment
- 39-946
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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The airworthiness directive
70-05-02 BRITISH AIRCRAFT CORPORATION: Amdt. 39-946. Applies to Viscount Models 744, 745D, and 810 series airplanes.
Compliance is required as indicated, unless already accomplished.
To prevent burn-through of aluminum piping, accomplish the following:
(a) For Viscount Models 744 and 745D airplanes, within the next 600 hours' time in service after the effective date of this AD replace the aluminum engine breather pipes located between the firewall and drains collector box with stainless steel pipes in accordance with British Aircraft Corporation Bulletin for Modification No. D.3226, dated March 17, 1969, or later ARB- approved issue or an FAA-approved equivalent.
(b) For Viscount Model 810 series airplanes, within the next 600 hours' time in service after the effective date of this AD, replace the aluminum engine breather pipes located between the firewall and drains collector box and the engine accessory gearbox aluminum breather pipe which connects into the engine breather piping, with stainless steel pipes in accordance with British Aircraft Corporation Bulletin for Modification No. FG.2102, dated March 17, 1969, or later ARB-approved issue or an FAA-approved equivalent.
This amendment becomes effective March 23, 1970.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.