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White
Blue
Black
12H120, 12M220, 14M220, 15M220,
18H120, 20H120, 24M220, 24H120,
24H100, 24SP100, 28SP100, 36H120,
38H100, 38SP100, 40SP100, 44SP100,
40SP100L, 44SP100L, 52H120C
3H120, 5H120, 17SP100, 17H100,
46SPE100, 20SPE100
10H120, 65H132
24ME220
Battery cells with aerobatic vents require special electrolyte adjustment procedures. Contact
MarathonNorco for further information.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 602
APR 15/06
6.1 Electrolyte Level Adjustment Procedure
Insert the syringe with the appropriate nozzle into the cell opening until the shoulder of the nozzle
rests firmly on the “O” ring seat. Withdraw the plunger and check for any electrolyte in the
syringe. If the level is too low the syringe will remain empty. If the level is too high any excess
electrolyte will be drawn into the syringe until the level corresponds to the depth of the nozzle
insertion into the cell. The depth of the nozzle into the cell is the correct electrolyte level.
If the electrolyte level is too low (the syringe remained empty) draw 10 CC’s of distilled or
demineralized water into the syringe and inject it into the cell. Withdraw the plunger. If the
syringe remains empty continue injecting measured quantities of water into the cell to achieve the
correct level.
At the point where some excess electrolyte is drawn into the syringe the correct electrolyte level
for that cell has been achieved. Discharge any excess electrolyte.
The amount of water required to fill the first cell should serve as an indication of the quantity
required to fill the remaining cells. However, the electrolyte level must be independently adjusted
in each cell.
Check to see that the quantity of water added per cell does not exceed the maximum allowable
for that cell type in Table 5. If the water consumption is too high, the service interval may need to
be reduced and/or check the charging system or voltage regulator setting.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 603
APR 15/06
TABLE 6
MAXIMUM ALLOWABLE WATER
CONSUMPTION
CELL TYPE VOLUME (cc)
3H120 3.5
5H120 4.5
10H120 8.0
12M220 31.0
12H120 31.0
14M220 25.0
15M220 25.0
17H100 16.0
17SP100 16.0
18H120 10.0
20SPE100 20.0
20H120 20.0
24M220 30.0
24H120 30.0
24ME220 96.0
24SP100 30.0
28SP100 24.0
36M220 37.0
36H120 37.0
38H100 78.0
38SP100 78.0
40SP100 34.0
40SP100L 34.0
44SP100 34.0
44SP100L 34.0
46SPE100 85.0
52H120C 142.0
65H132 53.0
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 604
APR 15/06
Proper Electrolyte Level Adjustment
FIGURE 5
L2
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 605
APR 15/06
FIGURE 6
FIGURE 7
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 701
APR 15/06
7.0 CAPACITY TEST
If following a charge, a noticeable rise in battery temperature has occurred (warm to the hand) allow the
battery to cool prior to proceeding with capacity test. When battery is cool proceed with capacity test
(measure discharge versus time) using one of the following discharge rates:
− C-rate for 51 minutes - 85% capacity requirement to minimum acceptable end voltage of 1.0 volts per
cell for in-service batteries.
− C-rate for 60 minutes minimum for new batteries.
OR
− C/2 rate for 120 minutes - 100% capacity requirements to minimum acceptable end voltage of 1.0
volts per cell for in-service batteries.
− C/2 rate for 135 minutes minimum for new batteries.
7.1 Interpretation of Capacity Test
If no cells have dropped below 1.0 volt before or at the end of the specified time, stop discharge.
The battery has successfully completed the capacity test.
If cells have dropped below 1.0 volt before or at the end of the specified capacity test time, do not
stop discharge. Battery must be reconditioned (deep cycled) according to Paragraph 8.0.
7.2 Boeing 100%
The following products for use on Boeing aircraft must meet C-Rate for 60 minutes or C/2 rate for
135 minutes on both new and in-service batteries.
MPTC Model MPTC P/N Boeing P/N
CA-27-20 28111-003 10-60707-9
CA-727-20 25582-003 10-60707-10
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Operating and Maintenance Manual For Nickel-Cadmium Aircraft(13)
