PS Magazine - TB 43-PS-720
PS, The Preventative Maintenance Monthly
ISSUE 720
NOVEMBER 2012
44
PS 720
NOV 12
45
PS 720
Dear Editor,
When M119A2 howitzer crews
are doing the BEFORE PMCS in
TM 9-1015-252-10, they need to
add a step when they get to Item
15 in WP 0040-15. Crewmen must
make sure the serial number for the
M140A1 alignment device’s mounting
bracket (or “dovetail”) matches that
of the howitzer’s serial number.
If the wrong dovetail is used, the
howitzer can fail the fire control
alignment test in WP 0049.
A dovetail can be adapted to another howitzer by being pinned, but this
can be done only once. Then the dovetail must be replaced. The pinning
procedure is in WP 0081 in TM 9-1015-252-34.
If you find the wrong dovetail, tell your repairman.
James Palmer
TACOM Left Behind Equipment Specialist
JBLM, WA
Editor’s note:
A good PMCS addition,
Mr. Palmer. Thanks.
When the bad removable fring pin is put in SAFE (3 o’clock position with the pin
retracted), it’s actually extended ±rom the breech cap in the FIRE position. And when
the bad fring pin is put in FIRE (9 o’clock with the pin extended), it’s retracted.
The result is a round that won’t fre in FIRE mode. I± the crew can’t remove the pin
and puts the sa±ety mechanism in the SAFE position to do the misfre procedure, the
round could fre i± it slips while using the round extractor. That could be a catastrophe.
So, be±ore another round is fred, repairmen should check all Stryker mortar
carriers ±or bad removable fring pins. Check spare fring pins, too. See WP 0370
in TM 9-2355-311-10-3-3 ±or the removal/installation and inspection procedures.
When the fring pin is in the SAFE position (3 o’clock), it should be ±ully retracted.
I± it’s not, you’ve got a bad pin.
M119A2 Howitzer…
Check
Alignment
Device’s
Mounting
Bracket
Serial
Number
M1129A1
MCV Stryker…
Bad Firing Pins
Dangerous
Make sure M140A1
alignment device serial
number matches that
of the howitzer
good grieF!
you
flunked
the
alignment test.
I thought you
were ready for
battle?!
I
would
be
if you got
the right
alignment
device.
some
bad
removable
firing pins,
nsn 1005-01–
583-2295, for
the stryker
mortar
carrier have
gotten out to
the field.
these firing
pins do the
opposite
of
what they’re
supposed to.
this
one
belongs
to another
howitzer.
remember,
you can use
any m2a1
barrel with any
m2a1 machine
gun without
affecting
timing and
headspacing.
When lever is unlocked and 180
degrees from SAFE position…
…pin should be at forward-most position
When lever is locked in SAFE position…
…pin should
be fully
retracted
720 44-45.indd
1-2
10/2/12
10:30 AM
Click here for a copy of this article to save or email.
Click here for a copy of this article to save or email.
Back to TopBack to Top
