PS Magazine - MAY 1978
PS, The Preventative Maintenance Monthly
ISSUE 306
MAY 1978
f [
'1
1
±
i
I
iI
±
QUADRANT
SEAtS
-
±
he
M201
cannon on your
MllOal
Has
·
a
breecH ring. For that Reason the
M201
tube caN be leveled dIrectly. ±f
your bReech has an embedded
correctIon sTamped on It, have It
stamped out and fInd the tube level
wItH yoUr gunneR's quadrant.
4
uadrant
.
ut
a g
unne
R
s
-T
or±end
firs²,
P
a
ssed
the
en
rant
seat
³
²ha²
ha
´
h
µ
ruzz\e QU
a
±
brIng
¶
·
\est
on
the bubb¸e¹
and
center
to
0
mI¸
s
º
uadraNt
you» tube
u
\'\he g
unne
R
S
d
¼
ant
seat
½hen
¾
p
E
ch
rIng
QU
a
.t
W
S
not
¿
on
the
pre
À1s
bubb¸e
I
d
½he
anD
:
Á
a
ÂÃ
a²Ing
ce
Ä
ÅÆÇ È
s
the
0
a¸»ea
•
ou
noÉ
en
the
readIngÊ
Ë T
acto»
be
Ì
e
d
and
the
cOÍrrec²ÎÏ
the
mu
z¸e
en
ch
rIng
¹
ÐI¸
s
Ñ
at
ta
Ò
en
at ²he
bree
»eading
Ó
CoRRECTIoN FACToR
±
±
he cor-
rectIon facTor is a mechanIcAl
vaRiaTIon iN elevatioN and you Have
to make allowance for it in taKing
your readIngs fRom The gunner²s
QuadRaNT at tHe breech. ±f your
correctIoN
factor (breecH rIng
readIng) Is (+) theN you have ³o
subTract(´) the factor to get the real
correct muzzle (oR Tube) elevatIon
angle. µowevER, If THe coRRectIon
facTor is mInus (¶)¸tHen you Have to
add it (+) to the elevatIon readinG
taken aT the breech to get the true
weapon elevaTIon¹
CANNoN TUBE LIFE-
ºhe Round lIfe of your
M201
cannon tube Is
dIffeRenT¹
Once you're suRe y»u Have you¼ correct½o¾ facTor ¼Ig¿TÀ Áecord ÂT ½N The ÃeMÄrkS
section o
Å
N THe
da
Form
2408²³
aND use it every time you mÄke a¾ eLevÄTIoN SetT½Ng
wiTh the gunner²s ÆuadrÄÇTÈ
M107
RECORD DATA
.
CAnNoN
EfC ´IFE
M201
7,500
rds
autoÉfretTage
tube
M2a2
7,500
Rds
M113aµ
¶,200
Rds
autoÊfRettage
tuBe
M¶¶3
400
Rds
E·C fActoR
Zone
9
(futuRe)
1.0
ËrIgINal plus
Zones
7²8
0¸7
4
tubes
Ì
Zones
1²6
0¹2º
Zone
7
»OO
Ío retubing
Zone
1¼6
0¸25
Zone
3
¶¸0
ÎerIaÏ Ío.
338
Zone
1²2
0¸10
and Ðbove¸
origInal and
5
tuBes.
Ñ
Zone
3
¶¸0
Zone
1²2
½¹¾0
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