Install guide
ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Section IV. MAINTENANCE
3-10. General. Direct support maintenance of PADS
includes replacement of the IMU, CDU, computer,
computer power supply, and power supply, and repairs
to those units as well as the mounting base subassem-
bly, battery box,
installation kit, transit case, and
winterization kit.
a. Torquing is required to ensure proper sealing of
the computer, CDU and power supply, and mounting of
the IMU. General torquing procedures are given in
paragraph 3-11,
3-11. Torquing.
a.
Use of Torque Wrench.
(See
figure 3-3.)
(1)
(2)
(3)
(4)
Place desired driver on torque wrench.
Set dial so main power is on zero.
Set follow-up pointer to zero.
Tighten fastener, with an uninterrupted rotary
motion, to the desired torque value. The fol-
low-up pointer will indicate the maximum
torque applied, Make sure the driver is per-
pendicular to the fastener head at all times.
b. Torquing Sequence. To provide consistent seal-
ing, fasteners must
be torqued in a specified pattern
with progressively increasing torque values. First, all
fasteners are torqued to 1/3 the specified maximum
value. Next, all fasteners are torqued 2/3 the specified
value, Finally, the fasteners are torqued to the specified
value. The torque patterns for the various units are
shown in figure 3-4.
3-12. Removal and Replacement of IMU in Transit
Case. This paragraph describes the removal and re-
placement of the IMU in the transit case. Figure 3-5
shows the IMU installed in the transit case.
a. Removal.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
3-20
Release latches securing cover to transit base.
Press pressure relief valve until air pressure is
equalized.
Lift off transit case cover.
Check humidity indicator. Take the action
shown on the indicator.
Loosen IMU retaining bolts.
Remove IMU.
Loosen memory unit compartment cover
screws.
Change 6
(8)
(9)
(lo)
(11)
OF PADS
Remove cover.
Loosen memory unit wedgelock screws.
Remove memory unit.
Inspect transit case shock and vibration isola-
tor mounts. Replace if frayed, broken, or
loose.
b. Replacement.
(1) Insert memory unit in compartment and
tighten wedgelock screws.
(2) Secure cover to memory unit compartment.
(3) Install IMU in transit case and torque IMU
retaining bolts to 50 inch-pounds.
(4) Carefully place cover on transit case and se-
cure with latches.
3-13. Unit Replacement.
This paragraph describes pro-
cedures for the removal and replacement of the CDU.
computer, computer power supply, IMU, and power
supply. Figure 3-1 shows PADS interconnections and
figure 3-6 is an exploded view of the primary pallet.
a. CDU. Remove and replace CDU (4, figure 3-6)
as follows:
(1) Removal.