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the negative or positive terminal of the battery and the other lead on any exposed metal of
the battery can; note the meter reading. If the meter reads negative, reverse the positions of
the meter leads.
Keep one-meter lead on the exposed metal surface of the can and move the other lead
systematically from one cell terminal to another, noting the voltage readings. Voltage
readings will decrease and finally go negative indicating the location of the path and possibly
a leaky cell.
If the cell is leaking, replace the cell or cells. If no leaking cells are found, the leakage path
may be due to electrolyte along the outside of the cells and at the bottom of the battery can,
and the battery must be discharged, disassembled and cleaned. (Reference Paragraph 9.0
and 11.0)
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 301
APR 15/06
3.0 TORQUING REQUIREMENTS
Verify torque on every intercell connection starting with cell 1 and working sequentially through the
last cell. Verify torque on cell connections to main battery connector.
TABLE 2
BATTERY OR
CELL TYPE
THREAD
SIZE
SOCKET
HEAD CAP
SCREW
TORX
SCREW
HEX NUT
ACROSS
FLATS
TORQUE
(INCH LBS.)
TO
TIGHTEN
3H120 #10-32 5/16” 15-18
5H120 #10-32 5/16” 15-18
10H120 5/16”-24 1/2” 20-25
10H120 #8-32 9/64” 30-35
12M220 5/16”-24 1/2” 20-25
12H120 #8-32 9/64” 30-35
14M220 #8-32 9/64” 30-35
15M220 #8-32 9/64” 30-35
17H100 #10-32 5/32” 35-50
17SP100 #10-32 5/32” T-25 35-50
18H120 #10-32 5/32” T-25 35-50
20H120 #10-32 5/32” 35-50
20SPE100 #10-32 5/32” 35-50
24M220CR #10-32 5/32” 35-50
24ME220C #10-32 5/32” 35-50
24H120 #10-32 5/32” 35-50
24H100 #10-32 5/32” 35-50
24SP100 #10-32 5/32” T-25 35-50
28SP100 1/4”-28 3/16” T-30 100-125
36M220 #10-32 5/32” 35-50
36H120 #10-32 5/32” 35-50
38H100 1/4”-28 3/16” T-30 100-125
38SP100 1/4”-28 3/16” T-30 100-125
40SP100 1/4”-28 3/16” T-30 100-125
40SP100L 1/4”-28 3/16” T-30 100-125
44SP100 1/4”-28 3/16” T-30 100-125
44SP100L 1/4”-28 3/16” T-30 100-125
46SPE100 1/4”-28 3/16” T-30 100-125
52H120C 1/4”-28 3/16” T-30 100-125
65H120 1/4”-28 3/16” T-30 100-125
81H120 1/4”-28 3/16” T-30 100-125
All other hardware should be torqued in accordance with FAA document AC.43.13 (Aircraft
Inspection and Repair)
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 401
APR 15/06
4.0 SENSOR ASSEMBLY INSPECTION
Inspect battery for proper placement of thermostats, heaters, thermistors or other sensor elements.
Inspect wiring and receptacle for insulation damage, corrosion, and crimping or other defects.
At least once each calendar year, perform a functional test on the temperature sensor assembly. All
functions must be within ± 10% of the values given in Table 3.
Dielectric Test: (If required in Table 3) Use a Dielectric (Hi-Pot) Tester capable of measuring a current
flow of 25 μA at 500 Volts DC. Place sensor leads in a small container filled with DI water, allowing the
assemblies to be submerged completely. Place the Negative (-) lead of the Dielectric tester in the
container with the sensor leads. While holding the receptacle, probe the pins listed in Table 3 with the
Positive (+) lead of the Dielectric tester to check for current leakage. A current flow greater than 25 μA
would constitute a failure.
.
MarathonNorco Aerospace, Inc.
OPERATING and MAINTENANCE MANUAL
NICKEL-CADMIUM AIRCRAFT BATTERIES
24-34-00 Page 402
APR 15/06
Table 3 (Page 1 of 8)
TEMPERATURE SENSOR ASSY. SPEC
Part Number Connector Type Active Pins Action Battery Type
28900-001 MS-3114P8-4P
PT07P8-4P
A-B Blue
C-D Red
Close at 140°F
Close at 160°F
TCA-5
TCA-5-20-1
TCA-5C
TCA-5-20-1C
28900-002 PT07P-8-4P
MS-3114P8-4P
A-B Blue
C-D Red
Close at 140°F
Close at 160°F
TCA-21-H-20, TCA-21H-1
28900-003 MS-3114P8-4P
PT07P8-4P
A-B Blue
C-D Red
Close at 140°F
Close at 160°F
TSP-400-1, TSP-400
28900-005 MS-3114P10-6P
PT07P10-6P
A-B Blue
C-D Red
E-F
Close at 140°F
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Operating and Maintenance Manual For Nickel-Cadmium Aircraft(8)
