PS Magazine - TB 43-PS-499
PS, The Preventative Maintenance Monthly
ISSUE 499
JUNE 1994
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W
hen
it comes To the M981 's north seekIng gyrocompass (NSG), There is
dRiftIng .±² and theRe is drIfting.
³SGs can drIFt up to
8
mIls per hour and be
OK¸
Here´s how to catch your ³SGµs
dRifT afTer you Do The ³SG conF¶dence check:
LooK ThRoUgh The tank per¶scope eyep¶ece· Position The Targeting head with The
hand conTrols so that the cRosshaIRs oF The ¸aser DesignaToR/rangefInDer
(
¹\º
)
RetIcle are cenTereD on a taRgeT wITh a known azimUth» ¼he AZ¶muTh d¶sp¸ayed on
The targeting staTion control and dIsplay
±
¼SC¹
²
shou¸d be roughly the same as the
Targetµs² ºecord The ¼S½¹ azImuTh¾
Leave the taRgeT¶ng head on The taRget ¿r
one hourÀ Make sure There Is no moVement
oF The crosshairs on the taRget and ThaT
The azimuTh numBeR does noT change
moRe Than
8
m¶¸s·
Áf The crosshairs moVed, something
may Be wrong with The Turret hydRau-
¸ics. Áf The crosshairs stayed on taRget
anD the change ¶n aZImuth was moRe
Than
8
mils, the ³SG is DrIFting too
mUch Ãeport eiTher pRoBlem To your
mechanic.
¼his proceDURe has been added To ¼M
9¹2350¹266º1»
on Pages
¼½¼85
anD
¼½¼86¾
PS 4¿¿
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JUNE ¿4
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