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CLEAN BATTERY, CHARGE AND
ADJUST ELECTROLYTE LEVEL.
CLEAN BATTERY, TIGHTEN OR
REPLACE CAP, CHARGE AND ADJUST
ELECTROLYTE LEVEL
SHORT OUT ALL CELLS TO 0 VOLTS,
CLEAN BATTERY, REPLACE
DEFECTIVE CELL, CHARGE AND
ADJUST ELECTROLYTE LEVEL.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 1302
APR 15/06
TROUBLE PROBABLE CAUSE CORRECTIVE ACTION
FAILURE OF ONE OR
MORE CELLS TO RISE TO
THE REQUIRED 1.55
VOLTS AT THE END OF
CHARGE.
Negative Electrode not fully charged.
Cellophane separator damage.
DISCHARGE BATTERY AND
RECHARGE. IF THE CELL STILL FAILS
TO RISE TO 1.55 VOLTS OR IF THE
CELL'S VOLTAGE RISES TO 1.55
VOLTS OR ABOVE AND THEN DROPS,
REMOVE CELL AND REPLACE.
DISTORTION OF CELL
CASE TO COVER.
Overcharged, overdischarged, or
overheated cell with internal short.
Plugged vent cap
Overheated battery
DISCHARGE BATTERY AND
DISASSEMBLE. REPLACE DEFECTIVE
CELL. RECONDITION BATTERY.
REPLACE VENT CAP
CHECK VOLTAGE REGULATOR:
TREAT BATTERY AS ABOVE,
REPLACING BATTERY CASE AND
COVER AND ALL OTHER DEFECTIVE
PARTS.
FOREIGN MATERIAL
WITHIN THE CELL CASE
Introduced into cell through addition
of impure water or water
contaminated with acid.
DISCHARGE BATTERY AND
DISASSEMBLE, REMOVE CELL AND
REPLACE, RECONDITION BATTERY.
FREQUENT ADDITION OF
WATER
Cell out of balance
Damaged "O" ring, vent cap
Leaking cell
Charge voltage too high
RECONDITION BATTERY
REPLACE DAMAGED PARTS.
DISCHARGE BATTERY AND
DISASSEMBLE.
REPLACE DEFECTIVE CELL,
RECONDITION BATTERY.
ADJUST VOLTAGE REGULATOR
CORROSION OF TOP
HARDWARE
Acid fumes or spray or other
corrosive atmosphere
REPLACE PARTS. BATTERY SHOULD
BE KEPT CLEAN AND KEPT AWAY
FROM SUCH ENVIRONMENTS
DISCOLORED OR
BURNED END
CONNECTORS OR
INTERCELL
CONNECTORS
Dirty connections
Loose connection
Improper mating of parts
CLEAN PARTS: REPLACE IF
NECESSARY. RETIGHTEN
HARDWARE USING PROPER TORQUE
VALUES. CHECK TO SEE THAT PARTS
ARE PROPERLY MATED.
DISTORTION OF BATTERY
CASE AND/OR COVER
Explosion caused by:
Dry cells
Charger failure
High charge voltage
Plugged vent caps
Loose intercell connectors
DISCHARGE BATTERY AND
DISASSEMBLE REPLACE DAMAGED
PARTS AND RECONDITION.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 1303
APR 15/06
TROUBLE PROBABLE CAUSE CORRECTIVE ACTION
CELL TO BATTERY CAN
LEAKAGE TO GROUND
DETECTED BY TESTING
Excessive spewage
Damaged cell case to cover seal.
CLEAN BATTERY, CHARGE AND
ADJUST ELECTROLYTE LEVEL.
RECHECK FOR ELECTRICAL
LEAKAGE.
DISCHARGE BATTERY AND
DISASSEMBLE, REPLACE DEFECTIVE
CELL, RECONDITION BATTERY.
FOAMING OF
ELECTROLYTE DURING
CHARGE
Contaminant in electrolyte
DISCHARGE BATTERY AND REPLACE
DEFECTIVE CELL.
RECONDITION BATTERY. REPLACE
CELL THAT CONTINUES TO FOAM
FALSE OR NO BATTERY
HIGH TEMPERATURE
INDICATION
Dirty connections
Loose connections
Improper mating of parts
Shorted thermistor or receptacle due
to KOH intrusion
CLEAN PARTS
INSPECT AND RETIGHTEN
RECEPTACLE
REPLACE SENSOR ASSEMBLY
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 1401
APR 15/06
14.0 STORAGE
The active materials of the sintered-plate, nickel-cadmium batteries do not react significantly with the
electrolyte during use or storage. Thus this type of battery may be stored for long period of time in any
state of charge or discharge without damage.
Nickel-cadmium batteries will incur only a temporary loss of capacity in inactive storage. The charge
retention depends largely on the ambient temperature in which the battery is stored and the length of time
in storage. Charge retention is also affected by impurities in the electrolyte and electrical leakage from
cells to battery case. In most applications, experience has indicated that a fully charged battery will be
capable of starting equipment even after six months of idle storage at room temperature. Storage at
higher temperatures will result in a greater loss of charge; at low temperatures, this loss will be much less.
Before placing a battery in storage, the battery should be cleaned. Where operation is required
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Operating and Maintenance Manual For Nickel-Cadmium Aircraft(17)
