Learjet 60 - BAT 140 and BAT 160 Lights; BAT TEMP Indicator; Battery Overheat Warning System; External Power Receptacle

Pilo's Manual
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Lea4et 60
BATTERY OVERHEAT WARNING SYSTEM
On aircraft
equipped with nickel-cadmium batteries, a battery overheat
warning system is installed to warn the operator of an impending bat-
tery overheat condition . The system consists of two thermoswitches in-
stalled in each battery, a temperature sensor in each battery,
two
overheat
warning
lights, a
temperature indicator, and
associated
air-
craft wiring .
BAT 140 AND
BAT
160 LIGHTS
e red BAT
140 and
BAT160
warning lights
on the
glareshield annun-
iator panel
are installed
to
warn
the pilot that a battery is overheating .
The lights are operated by thermoswitches installed in the battery links .
7be BAT 140 light will illuminate in the event either battery reache
temperature of 140°F . The BAT 160 light will illuminate in the event ei-
ther battery
reaches a temperature of 160'F . Since both BAT 140 ther-
ms and both BAT 160 thermoswitches
are wired together, the
pilot must refer to the BAT TEMP indicator to determine the
malfunc-
tioning
battery .
BAT TEMP INDICATOR
The BAT TEMP indicator is a dual-reading, vertical-scale instrument
and is usually located in the copilot's instrument panel
.
The indicator
face consists of a center scab, marked from 50OF to 200'F in 25'F
incre-
ments and two pointers on opposite margins of the scale . The pointer
indicating #1 battery temperature is on the left margin and the pointer
indicating #2 battery temperature is on the right margin . Each
pointer
is operated by a temperature
sensor installed in the corresponding bat-
tery cell links . Electrical power to the indicator is 28 NTX" supplied
through the 1-amp BAT TEMP circuit breaker on the pilots circuit
breaker panel .
EXTERNAL POWER RECEPTACLE
External power may be connected
to the aircraft
DC electrical distribu-
tion system
through a standard receptacle
located on the
right fuselage
below the pylon . To
start an
engine or operate aircraft systems using ex-
ternal power at least one BATTERY switch must be in the On position ;
however, the generators will not come on-line with an
external power
source connected
.
External power
over-voltage protection circuits will
open the external power relay and disconnect external power from the
aircraft DC distribution system in the event the external power
source
exceeds approximately 32 volts . External
power source amperage must
be limited to a
maximum of 1500 amps as specified on the placard
above the external power receptacle .
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