ARMY TM 9-6675-349-12&P
MARINE CORPS TM 11039-12&P
2-9. Install IPADS in UH-60 Helicopter - Continued
b. Install Plumb Bob Arm.
(1) Obtain plumb bob arm, Teflon shoulder washers, flat washer, and machine screw, figure 1-7.
(2) Install Teflon shoulder washers into plumb bob arm, figure 2-23.
(3) Install plumb bob arm to bottom of frame with machine screw and flat washer, figure 2-23.
(4) Using 9/16-inch wrench tighten machine screw until snug.
Machine
Screw
Flat Washer
Teflon Shoulder
Washer
(5) Check plumb bob arm operation. Arm should rotate without binding.
(6) Secure arm in vertical position using attached pin. Pin locks into corresponding pinhole on frame.
