SAFT AMERICA INC.
COMPONENT MAINTENANCE MANUAL
4579
24-31-05
PAGE 1
Jan 30/98
DESCRIPTION AND OPERATION
1. Description
The Nickel Cadmium Battery provides power either to the standby system or to start the
auxiliary power unit (APU). It is a nickel-cadmium type with sintered plate construction, and
uses a potassium hydroxide electrolyte. The battery consists of a case and cover, 20 cell
assemblies, and a temperature sensor assembly. The sensor assembly includes a
thermoswitch mounted on a plate against the end of the center row of cells. A charge control
thermistor is located between cells 6 and 9 in the center row of cells.
2. Operation
The battery is charged on the aircraft by an on-board charger. The charge control thermistor
provides a signal to the charger to compensate the charge according to the battery
temperature. The thermostat will cut off the charger if the battery temperature exceeds a safe
operating limit.
Nickel-Cadmium Battery
Figure 1
Battery
Cover
Battery
Case
Temperature
Sensor
Assembly
Connector
Battery
Receptacle
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