PS Magazine - TB 43-PS-425
PS, The Preventative Maintenance Monthly
ISSUE 425
APRIL 1988
ment system processor is not sealed.
ProcessoR
is not
sealed
When the insIde of the processor gets
wet, some of your cRitical instruments
can gO haywiRe in a hurry.
Keep moisture out of the nose com-
partment by keepIng a close eye on the
'
compartmeNt d±or seal² Chec³ it out at
least every 10 hours oR 14 days, which´
ever comes Frst, lI³e it says in Sequence
1.5 ofTM 55µ1520¶237·PMS¶L²
¸ook ¹r cRacks, cuts, brittleness and
de¹rmIties iº the rubber seal.
»f it¼s
damage
D
oR hard and bRittle, rep½ace it
wIth ¾S¾ 5330¶0LµLL4µ2342.
44
APR 88
p
raVIN&
,
: ±·
.-
¿
À
A ½ot
of
APU Á"d gÂn
:
±²³
ontÃl boxÄ, P¾
:
;
077¶41,
i
n
re
;±
12
;\
Å
±² ³ '
·
±
depot ¹r repair are not bad.
´
. g
That¼s rigHt² The depot tests tÆe relay contRol boxes be¹re tHey repair them and
fÇnd theRe¼s nothing wRong with tHe boxes.
1
´
Èt might be because the É41 contRo½ box does not have the time¶delay relays and
I
load ResIstoRs thaÊ aRe built into the
l
14E20Ë˵43 control box that¼s installed in
some C¶model Chiºooks.
±
0
RELAY BOX ASSY.
APU & GEN± CONT²
If youR bird's controL box has
2
µ
relays mounted on the outs²de
of the box, it³s a
¶·3
rELAY BOX ASSY.
APU & GEN³ CONT.
If youR b²Rd³s controL box has
no external relays, ²t's a
¸·1
I
THe time¶delay reÌays and load Resistors are built Into the generator control panelÍ
Sending ¶41 boxes back to depot without thorough troubleshooting Is a big waste
in time, eÎort aºd money.
When your bIg bird¼s APU fÏi½s to start or aboRts aÐteR staRting, go by the boo³
In peÑfÒRming operational checks and troublesHooting²
²
i
Óperatioºal chec³s are Ìisted in Para¼s 15µ4 thRough 15¶8 of TM 55¶1520¶227¶
23µ4. Para 15µ9 te½ls you where to enter troubleshooting Table 15¶1 based on the
Results of your opeRational checks.
»Ð the operational checks and troubleshooting fÏil to Isolate the cause of the noÔ
start Õr start¶abort, check out the troub½eshooting procedures ¹r theAPU in Section
4 of TÖ 55µ2835µ203µ24.
»f the relay control box is at ÐÏult, Replace It and tu× It in to AV»M ¹r repaIr.
APR 88
4
5
i¹
º
»
±
¼
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