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caution panel. The capsules are labeled XMSN OIL HOT,
XMSN OIL PRESS, XMSN AUX OIL PRESS, and
712 NO. 1 AND NO. 2 ENG XMSN HOT, 714A ENG 1
or ENG 2 XMSN HOT. These cautions, in conjunction
with the transmission oil pressure and temperature indicators
on the center instrument panel and the TRANSMISSION
OVERTEMP magnetic indicators, MAIN OIL
PRESS, and AUX OIL PRESS indicating lights on the
MAINTENANCE PANEL, alert the crew to impending
transmission lubrication problems. The cautions operate
independently of the pressure and temperature indicators
on the center instrument panel.
a. XMSN OIL HOT Caution. It illuminates when the
main oil temperature in the sump of the forward, aft and
reservoir of the combining (mix) or either engine transmission
exceeds 140
C. The hot transmission is identified
by the oil temperature selector switch and indicator
and the TRANSMISSION OVERTEMP magnetic indicators
on the MAINTENANCE PANEL.
b. XMSN OIL PRESS Caution. It illuminates when
main oil pressure drops below 20 psi in any transmission
or aft rotor shaft pressure drop below 10 psi. The lowpressure
system is identified by the transmission oil pressure
selector switch and indictors on the center instrument
panel and the TRANSMISSION MAIN OIL PRESS
indicating lights on the MAINTENANCE PANEL. If the
XMSN OIL PRESS caution capsule illuminates and the
affected transmission cannot be determined using the
selector switch, the condition may be caused by loss of
aft rotor shaft oil pressure. Low oil pressure at the aft rotor
shaft is indicated by the illumination of the TRANSMISSION
AFT SHAFT MAIN OIL PRESS indicating light on
the MAINTENANCE PANEL.
c. XMSN AUX OIL PRESS Caution. It is activated
by individual aux oil switches and illuminates when auxiliary
oil pressure drops below 20 psi in the fwd or aft
transmission and 10 psi in the combining (mix) transmission.
The transmission with the low pressure is identified
by a lit TRANSMISSION AUX OIL PRESS indicating light
on the MAINTENANCE PANEL.
d. 712 NO. 1 or NO. 2 ENG XMSN HOT, 714A
ENG 1 XMSN HOT or ENG 2 XMSN HOT Caution. They
illuminate if oil temperature in either engine transmission
exceeds about 190
C. The capsules are activated by a
thermoswitch in each engine transmission. The thermoswitch
monitors oil temperature in the transmission, not
in the reservoir. It is part of a chip detector and temperature
assembly in each engine transmission.
2-7-11. Transmission Chip Detectors.
Chip detectors are installed in all transmission and aft
rotor shaft thrust bearing lubrication systems. All transmission
chip detectors, except those in the engine transmission,
are connected to the XMSN CHIP DET caution
capsule on the master caution panel. Engine transmission
chip detectors are connected to the corresponding
712 NO. 1 or NO. 2 ENG CHIP DET, 714A ENG 1 or
ENG 2 CHIP DET caution capsules.
All transmissions and aft rotor shaft chip detectors are
also connected to the TRANSMISSION CHIP DETECTOR
magnetic indicators on the MAINTENANCE PANEL.
When a chip detector is bridged by ferrous particles,
the XMSN CHIP DET, or the 712 NO. 1 and/or NO. 2
ENG CHIP DET, 714A ENG 1 and/or ENG 2 CHIP DET
caution capsule illuminates. At the same time, the corresponding
TRANSMISSION CHIP DETECTOR indicator
on the MAINTENANCE PANEL will trip and change from
an all-black indication to a black-and-white indication,
identifying the transmission.
TM 1-1520-240-10
2-7-4
2-7-12. Transmission Chip Detectors Fuzz Burn-
Off.
Helicopters equipped with the chip detector fuzz burn-off
system in the forward, combining (mix), aft, No.1 and No.
2 engine transmission, and aft rotor shaft thrust bearing
are identified by a module labeled PWR MDL CHIP
BURN-OFF located below the MAINTENANCE PANEL.
The chip detector fuzz burn-off system employs an operated
fuzz burn-off electrical circuit with the ability to eliminate
nuisance automatically chip lights caused by minute
ferrous metallic fuzz or ferrous metallic particles on the
transmission chip detectors. The response time of the
fuzz burn-off circuit is more rapid than that of the helicopter
warning system; thus a successful fuzz burn-off will
be accomplished before any caution capsule on the master
caution panel illuminates. Should the particle or particles
not burn off, the XMSN CHIP DET caution will illuminate.
Also, the corresponding TRANSMISSION CHIP
DETECTOR or ENGINE CHIP DETECTOR magnetic
indicator on the MAINTENANCE PANEL will latch. Power
for the PWR MDL CHIP BURN-OFF is supplied by the
　
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