59-24-01 VICKERS: Applies to all Viscount Model 810 Series Aircraft.
Compliance required by December 31, 1959.
In order to preclude the possibility of excessive glare affecting the pilots, the following modifications are required.
(a) The propeller below low stop warning lamps which are located on the fire control panels should be covered by filtered lamp cowls Vickers P/N 81536.287.
(b) Replace the existing lamp cowl Vickers P/N 74536-745, which is installed at the propeller low stop removed warning lights, with an improved lamp cowl Vickers P/N 75436-265.
The British Air Registration Board considers this mandatory.
(Vickers-Armstrongs Modification Bulletins Nos. FG-1559 and G-1668 cover this subject.)