CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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[ Chapter 96 TOC ]
Page 208
Revision 8
96-05-00
The information disclosed herein is proprietary to MD Helicopters, Inc.
Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright © 1999−2016 by MD Helicopters, Inc.
A. Temperature Sensing Light/Switch
Indicators
The indicator light/switches are electrically
connected to low and high temperature
sensing switches installed on a bus bar of the
ni-cad battery. (The switches are part of and
are furnished with the battery.) Figure 202 is
the wiring diagram for the sensing indicators.
Both indicator light/switches contain a built-in
press-to-test switch for testing internal lights
and function as follows:
NOTE: Indicator lights used on instrument
panels (T-shape) are part of the caution and
warning light assembly. Lights are tested
through the main PRESS-TO-TEST
switch. Function and maintenance of this
system is essentially the same as for the in
dicator lights used on slim line instrument
panel.
(1). Low Temperature Caution (Amber)
Indicator:
A rise in battery temperature to 140
°F
causes the low temperature switch to
close and apply +dc voltage from the
battery to illuminate the amber caution
light.
(2). High Temperature Warning (Red)
Indicator:
An increase of battery temperature to
160
°F causes the high temperature red
light to illuminate.
(3). Testing Temperature Indicators:
When pressed, the press-to-test switch
of each indicator applies +28 Vdc from
panel lights circuit breaker CB104 to
the applicable light indicator to test its
internal lamp for illumination.
B. Battery Temperature Sensing Equipment
Maintenance
Maintain battery temperature sensing
equipment as shown in Figure 202 and as
follows:
(1). Refer to Chapter 95 for locations of
instrument panel components.
(2). As required, perform Battery Tempera
ture Sensing Equipment Operational
Check.
(3). For information on low and high
temperature switch limits, refer to
Battery Temperature Sensing Switches
Testing.
(4). Troubleshoot battery temperature
sensing equipment according to
information on troubleshooting of
caution and warning light indicators
(Ref. Chap. 95).
C. Battery Temperature Sensing Switches
Testing
(Ref. Figure 201)
Consumable Materials
(Ref. Section 91−00−00)
Item Nomenclature
CM219 Methyl-ethyl-ketone
(1). Remove battery from helicopter per
Battery Replacement. Remove bus bar
equipped with sensors and connecting
wires.
(2). Use container (oil or water), thermome
ter and heat source. Submerge sensor
bus bar and check at battery sensor
connector plug for proper heat range.
(a). Low temperature switch:
Closes on temperature rise at 140
±8
°F.
(b). High temperature switch:
Closes on temperature rise at 160
±8
°F.
(3). Clean bus bar with MEK (CM219) and
reinstall.
NOTE: Sensors may be removed from bus bar
for testing or replacement. (Ref. Battery Re
pair)
(4). Reinstall battery per Battery Replace
ment.
(5). Inspect electrical wiring for security,
physical damage and continuity.
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