58-18-03 VICKERS: Applies to All Viscount 700 Series Aircraft.
Compliance required by November 1, 1958.
Following a recent case of damage to Nos. 1 and 2 flaps, beams and telescopic rods caused by a flap chain tensioner barrel becoming completely unscrewed on No. 1 flap chain, Vickers-Armstrongs recommends the wirelocking of flap chain tensioners on Nos. 1, 2 and 3 flaps.
The British Air registration Board considers this mandatory. The FAA concurs with this action and considers compliance therewith mandatory.
(Vickers-Armstrongs Modification D.2554 covers this subject.)