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terminals. Before subjecting battery to electrical service this device must be removed
1.1.3 Electrical connections
Test all terminal hardware to ensure tightness. If necessary retorque them to the proper value.
Poor electrical contact between mating surfaces may reduce discharge voltage, cause local
overheating and damage the battery.
1.14 Liquid level - Do not add water to a battery except near the end of a constant
current charge. Some exceptions may be noted later.
Addition of water, except at the proper time during the charge will cause spewing of electrolyte to
take place during the subsequent charge. MarathonNorco batteries are shipped with the proper
amounts of electrolyte. When a battery has been discharged or allowed to stand for a long period
of time, the electrolyte becomes absorbed into the plates. Since the battery has been shipped in a
discharged condition, the liquid level of the cells may appear to be low. Charging the battery will
cause the liquid level of the individual cells to rise to the proper operating level. If this does not
happen, add sufficient distilled or demineralized water (using the proper syringe and nozzle) to the
cells during the last 15 minutes of the topping charge, until the correct liquid level is reached.
BEFORE CHARGING THE BATTERY READ AND BECOME FAMILIAR WITH THE CHARGE
PROCEDURE.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 102
APR 15/06
WARNING: THE ELECTOLYTE USED IN NICKEL-CADMIUM BATTERIES IS A STRONG
CAUSTIC SOLUTION OF POTASSIUM HYDROXIDE. USE RUBBER GLOVES,
AN APRON AND A FACE SHIELD WHEN REPAIRING OR SERVICING THE
BATTERY. IF ELECTROLYTE IS SPILLED OR SPRAYED ON CLOTHING OR
OTHER MATERIALS, IT SHOULD BE BATHED IMMEDIATELY WITH LARGE
QUANTITIES OF WATER NEUTRALIZED WITH A WEAK ACID SOLUTION
SUCH AS VINEGAR. IF ELECTROLYTE GETS INTO THE EYES, FLUSH
COPIOUSLY WITH WATER AND GET MEDICAL ATTENTION IMMEDIATELY.
1.2 INSPECTION IN THE AIRCRAFT
1.2.1 Vent Lines
When installing a battery in the aircraft, check the vent lines for obstructions, leaks or damage of any
kind and repair or replace. Check battery box vents for obstructions or cracks and repair.
1.2.1 Battery Disconnect
The following procedure defines an inspection program to field check the aircraft battery quick
disconnect.
1.2.2 Equipment Required
Quick disconnect inspection gauge (Reference Special tools).
1.2.4 Procedure
Inspection of Battery Quick Disconnect: Remove all electrical loads from the battery then disengage
the battery disconnect from the mating receptacle, and inspect for the following:
A. Evidence of corrosion or pitting of the power contacts.
B. Excessive free-play in the handwheel- worn assembly, broken pins.
C. Evidence of arcing of burn marks on the power contacts. This is caused when the
disconnect is removed under electrical load.
D. Insert the .385 inch diameter end of the inspection gauge into each power contact to a
depth of .437 inches. The fit shall be snug with a force to remove greater than one (1)
pound. This is to test the resiliency of the power contact to an oversized pin.
E. Insert the .370 inch diameter end of the inspection gauge into each power contact to a
depth of .437 inches. The fit shall also be snug with a nominal force to remove one (1)
pound. This will ensure proper contact to a worn or undersized contact pin.
F. Replace if required.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 103
APR 15/06
1.2.5 Voltage Regulator
The voltage regulator should be set at a level consistent with the normal ambient
temperature band and should be set on the aircraft after a start and a few minutes into the
charging period (seeTable 1). Periodic checks to correct out- of-tolerance regulators and
replacement of defective units will reduce the possibility of inadvertent increases in
charging voltage with the resultant rise in charge current and battery temperature and
water consumption.
Recommended voltage settings measured at the battery terminals and applicable to room
temperature conditions, under a known time span of 4 hours are shown in Table 1. (These
are nominal values computed by multiplying the number of cells in the battery by a factor of
approximately 1.5). For voltage regulation at ambient temperature higher or lower than
75°F (24° C), see Figure 3.
Table 1 - Recommended Voltage Regulator Setting at 75°F (24°C)
Number
of
Cells
Nominal
Battery
Voltage
Time
In
Hours
Voltage
Maximum*
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Operating and Maintenance Manual For Nickel-Cadmium Aircraft(6)
