PS Magazine - TB 43-PS-560
PS, The Preventative Maintenance Monthly
ISSUE 560
JULY 1999
M139 Mine Dispenser . . .
Backing Up
Always use ground guides to back
up the Volcano. There’s no other way
to do the job safely. Don’t forget that
the Volcano sticks out a foot over the
back of the truck. Volcano rails and
controls are banged up if you don’t
allow for that.
Ground It
If the Air Volcano is parked in the
hanger, be sure to ground the helicop-
ter. That protects the Volcano from
static electricity.
No lights? Try
replacement fuse
down. If the display doesn’t light, screw
in the replacement fuse that’s part of
the DCU. If that doesn’t light up the
DCU, tell your repairman.
No lights? Turn BRIGHT dial
Cables
Easy does it when you hook up the
cable to the dispenser control unit
(DCU) and the racks. The connectors
have pathways and must be mated just
right. If you force the cable on, you
bend pins and get BIT faults.
Don’t try to hook up cables wearing
gloves. Your hand needs to be as ma-
neuverable as possible.
If you’re dealing with the Air Vol-
cano, use the adapter connector. Install
the adapter to the rack port and then
mate the cable to the adapter. That
makes mating easier.
DCU
Before you operate, push the DCU
breather valve to make sure it’s not
sticking. A sticking valve will let mois-
ture build up in the DCU and cause
electrical problems. Your repairman can
fix a problem valve.
If the DCU indicators don’t light,
don’t panic. Turn the BRIGHT dial
clockwise. It may have been turned
Breather valve sticking?
you’ll have firing problems and built-
in test (BIT) faults. The easiest way to
clean the connectors is to blow them
out with an air hose at the end of op-
erations. Wiping them out with a dry
cloth works, too. Keep the rack covers
zipped in place to protect the racks
when you’re not operating.
how
may i serve
you, oh mighty
volcano
?
good
pm!
Blow breech connectors clean
Locking
pins in
place?
Lanyards
attached?
Rack
Keep the rack breech connectors
clean. If they become dirty or corroded,
f you expect your Volcano to spew
mines freely, you Volcanic crewmen
need to pay your respects to the PM
gods. Here’s what they demand:
Locking Pins and Lanyards
If the Volcano is missing even one
of its locking pins, it’s NMC. It’s dan-
gerous to operate with missing pins.
The launching rack could come apart
during firing. Check for every pin—
and look for pin lanyards, too. If a
lanyard’s missing, the pin soon will
be. Report missing pins and lanyards.
PS 560
23
JUL 99
PS 560
22
JUL 99
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