- Effective
- May 14, 1970
- Models
- Viscount 744, Viscount 745D, Viscount 810
- Data sheet
- TCDSA-814
- Product
- Aircraft · Large airplane
- Amendment
- 39-975
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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On this page
The airworthiness directive
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.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.