59-22-02 VICKERS: Applies to All Viscount 810 Series Aircraft Which Do Not Embody Modification FG.1447.
Compliance required as indicated.
Service experience has shown that a gap of less than 0.25 inch between the end of No. 3 flap and the aileron may, under certain flight conditions, produce a condition where the flap could foul or contact the inboard end of the aileron (port and starboard wings). Within the next 500 flight-hours but not later than December 15, 1959, inspect for adequate clearance between the outboard end of the No. 3 flap at the No. 4 flap beam unit and the inboard end of the aileron on both the right and left sides. This inspection must also be carried out whenever a flap or an aileron is installed. Where the gap is found to be less than 0.25 inch the outboard end of the No. 3 flap must be modified to provide proper clearance.
(Vickers-Armstrongs PTL No. 80 (800/810 Series) and Modification FG.1447 cover the same subject.)