PS Magazine - TB 43-PS-437
PS, The Preventative Maintenance Monthly
ISSUE 437
APRIL 1989
CH-470 .±.
THE CAP•S the ±²ING
T
he gap has to be just right between
the engine cover frmer and the Fixed
±Ireshield.
No gap means the FOrmer gasket gets
toM and has to be repLaced²
Too mUch gap Lets Fire extinguishing
agent leak out oF the engine compar³-
ment in the event oF an engine FiRe²
So, aLways adjUst the gap to
²³²´²
to
²³1²²
incH² No more. No Less² Just
rIght² ´
AH-µ ¶¶¶
Overlooked PM
H
ere
are
some
common
Cobra
maintenance procedures that aµe over-
Looked by some mechanics:
0
Tie the saFety wIre on tHe main
rotor pitch cHange t¶bes so that the pig-
taiL is up instead oF down² ·t prevents
damage to the tube during instalLation
and ¸igh³¹
Tie
pIgtaIl
away
from tube
0
ºemove the wire cover on tHe
transmission chip detector so that it
won't FilL with water and corrode²
0
·nstalL screens in battery vent
holes to keep insects »om cLogging the
lines² CLogged vents can lead to a bat¼
tery explosion¹
±nstaLL screen in vents
36
aPR 89
Ah-·4 ±¸¹
iµ in your Apache's hydµaulic sys½
tem will cause the hydrauLic pump to
"cavitate²¾
That's just a F¿ncy way oF saying
it'lÀ Àose all suction² When that hap-
pens, it takes less than
º²
seconds FOr
the pump to buM up²
0
1ve
og³r
To µeduce chances oF buÁÂng up the
hydraUlic
pump,
bLeed the system
every time you add FÀuid²
ÃoÀlow the procedures in Para
»¼5¼2²
oF TÄ
55½»52²¾2º¿¾2º¾1³
Prohibition on AlcohoL
containing
contact hydraulic Fluid, the resuLt is a
residue that can cause hydrauLic comÅ
'
ponents to seize up dUring operation²
·
So never use any kind oF soLvent or
cleaning compound that contains aL-
cohoL to clean your bird's hydrauLic
components²
aPR 89
3À
SticK with what your maintenance
manuals calÀ FOr² ÄethyLÆethyLÆKetone,
p¾D¾Á¿²,
and acetone are
OKÂ
They
don't contain any aLcohoL²
i
.I
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