# AD 70-08-04: Cabin Blower Drive Quill

- Type: Airworthiness directive
- Status: Current
- Products: Vickers-Armstrongs Viscount 744, Viscount 745D and Viscount 810
- Effective: May 14, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-975
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4DF964E2848F69CB862569A40059BC26.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-08-04

## 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 data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-814](https://openairdocs.org/tcds/A-814): Vickers-Armstrongs (Aircraft Limited); names 3 of 3 models: Viscount 810, Viscount 744, Viscount 745D

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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