PS Magazine - TB 43-PS-607
PS, The Preventative Maintenance Monthly
ISSUE 607
JUNE 2003
PS 607
JUNE 03
11
M1A1 Tank…
PS 607
JUNE 03
10
j
amming the driver’s AN/VVS-2 night vision viewer into its mount without adjust-
ing the wiper blades will break the viewer housing and damage the wipers and flex-
ible shaft parts.
Normally, the wiper blades are left in the upper left or right positions so they’re
not in the driver’s field of vision. But when the scope comes out, the wipers retract
into the hatch housing just enough to become trapped between it and the night
vision viewer.
Once you tighten down the wingnuts, the prism housing cracks and the wiper
blades are damaged. To make matters worse, moving the handle to operate the
jammed wipers can damage the flexible shaft and linkage parts of the wiper mech-
anism.
Make sure this doesn’t happen by placing the wiper blades in the vertical position
(straight up-and-down) and holding them away from the opening before removing
the center scope just like it states in the -10 TMs. That way the wipers still work and
the prism doesn’t get cracked.
G
et out those stubby pencils, crewmen. It’s time to make a change to your M1A1
tank’s -10-1 TM.
Page 1-45 on the tank’s NBC system says there are only three configurations of
the tank commander’s panel. But now there are five.
Use the same procedure
when you remove the night
viewer and reinstall the
center scope to avoid dam-
age to the wiper blades.
Make sure wipers are vertical
before
removing center scopes
My wipers
weren't in
the right
position!
My periscope
prism housing has
cracked up!
So, until the TM is updated, replace
Para 2 with the following:
“There are five configurations of
the tank commander’s panel. Part
numbers 9376322 and 9377879 will
start NBC System when engine
starts unless turret networks box cir-
cuit breaker CB3 is turned off. Part
numbers 12549797, 12549797-2, and
12549797-3 will not start NBC
System automatically.”
You’ll find
the part number
on the panel’s
data plate.
There are now five configurations
of tank commander’s panel
Another
change,
huh?
yep! you may
have one of
five different
configurations
of the tank com-
mander’s panel.
M1-Series Tanks…
607. 10-11 (C)
5/2/03
1:27 PM
Page 1
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