59-17-06 HELIO: Applies to All Model H-391B Aircraft and Model H-395, Serial Number 075 and 502 Through 509 Inclusive.
Compliance required within next 100 hours or by November 1, 1959, whichever occurs first.
Install additional pulley guards at three 3-inch stabilator control system pulleys located at:
(a) The upper left-hand corner of the fuselage truss just aft of the firewall.
(b) Just forward of the lower left-hand side of the instrument panel.
(c) Directly under the forward attach point of the vertical stabilizer in the aft portion of the tail cone.
(The cable makes a 180 degree turn around this pulley.)
(Helio Service Bulletin No. 20 covers this subject.)