STORAGE BATTERY (NICKEL-CADMIUM) - ADJUSTMENT/TEST
1.  Storage Battery Test
A.  General

(1)  The three-phase input to the battery charger is obtained from the 115-volt ac ground service bus, or from the No. 2 main bus through the alternate battery charger circuit breaker. The three generators, external power, or the APU may be used for charging the battery.
NOTE:  External power can be used to charge the battery but cannot be used to test the battery. Upon application of external power, refuel relay R10 opens and causes the charger to operate in the high temperature mode. The charger does not pulse in the high temperature mode.
B.  Equipment and Materials
(1)  
Deleted.

(2)  
DC ammeter - 0- to 100-milliamp range

(3)  
Resistor - 50 ohms

(4)  
Power supply - 50 volts dc

C.  Test Nickel-Cadmium Storage Battery
(1)  Determine that battery is fully charged by observing battery charger pulsing while charging from APU or engine generator.
NOTE:  Battery normally will be charged if the airplane has recently terminated a flight and the battery was not used to operate equipment. With a limited pulse type charger, pulsing will start again if battery charger circuit breaker is opened and then closed, and battery is fully charged. Pulsing with a limited pulse type charger will continue only for approximately 2 minutes.
(a)  
Start APU and apply power to all main ac buses. Disconnect external ac power cord from airplane.

(b)  
Turn dc meter selector switch on forward overhead panel to BAT.

(c)  
Open battery charger circuit breaker on P6-4 panel and close after a 2-second delay.

(d)  
Observe battery voltage and charge current on dc meters. Meters should be pulsing if battery is fully charged.

501 
May 1/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  24-31-11 Page 501 

NOTE:  Battery bus and hot battery bus circuit breakers on right load control center panel P6 must be closed to obtain a voltage indication.
(2)  
Allow battery to charge if not fully charged. A slowly decreasing indication of more than 16 amperes is a normal rate of charge.

NOTE:  Charge current may initially be quite high but should gradually reduce.  If, after about 45 minutes for a discharged battery, pulsing has not started, remove battery.  In temperatures of 110°F or over, a discharged battery should be removed for recharging in a cool area, to prevent excessive gassing.

(3)  
Check leakage between battery cells and case (batteries with non-insulated steel cases).

CAUTION:  BATTERIES WITH INSULATED CASES ARE NORMALLY NOT SUBJECT TO ELECTRICAL LEAKAGE BETWEEN CELLS AND CASE. HOWEVER, CARE MUST BE EXERCISED TO ELIMINATE ELECTROLYTE SPILLING ON BATTERY CASE; OTHERWISE LEAKAGE MAY OCCUR.
(a)  
Disconnect battery cable connection by loosening hand knob and lifting plugs off terminal pins.

(b)  
Connect 50-ohm resistor, 100-milliamp ammeter, and 50-volt dc power supply per figure 501.

(c)  
Place one probe of test apparatus to battery negative terminal pin and the other probe to battery case.

(d)  
Observe that current leakage does not exceed 50 milliamps. Maximum allowable current leakage is 50 milliamps.

(e)  
If leakage rate exceeds 50 milliamps, remove battery, flush with clean tap water and dry thoroughly in the sun or by applying forced warm air. Recheck leakage rate before reinstalling battery in airplane.

501 
24-31-11 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/73 

H21471
501  Battery Cell to Case Leakage Test 
May 15/73  Figure 501  24-31-11 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

STORAGE BATTERY (NICKEL-CADMIUM) - INSPECTION /CHECK
1.  Storage Battery (Nickel-Cadmium) Check
A.  General

(1)  To permit a complete examination of the storage battery, it is recommended that it be removed from the airplane. Removal will also permit examination of supporting parts such as the battery tray, cover and temperature switch.
B.  Check Storage Battery (Nickel-Cadmium)
(1)  
Move battery switch to OFF and disconnect battery from the airplane system, and remove battery. Refer to Storage Battery (Nickel- Cadmium) - Removal/Installation.

(2)  
　
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