(a)
Check that NO 1, NO 2, and TR3 lights on M238 come on.
(b)
Check that dc voltmeter reads 26 + 4 volts when dc meters selector switch is set to TR 1, TR 2, and TR 3.
(3)
Set BUS TRANSFER switch to OFF.
(a) Check that NO 1 light on M238 goes off.
(4)
Open TR UNITS NO 3 (C808) circuit breaker on P6-4.
(a)
Check that TR3 and NO 2 lights on M238 go off.
(b)
Check that BATT light on M238 remains on.
F. Test External DC Power
(1)
Connect external dc power to battery control shield per placarded instructions and close EXTERNAL POWER DC (C542) circuit breaker on J9.
(2)
Disconnect connector from airplane battery and isolate connector from structure.
CAUTION: HANDLE CONNECTOR CAREFULLY WHILE VOLTAGE IS APPLIED.
(3)
Check that APU can be started from external dc power (Ref. 49-11-0, MP).
G. Restore Airplane to Normal
(1)
Remove external dc power and connect battery connector.
(2)
Close all circuit breakers remaining open on P6-4, P6-5, and P6-6 panels.
(3)
Set BUS TRANSFER switch to AUTO and STANDBY POWER switch to AUTO.
(4)
Remove external power if no longer needed (Ref. 24-22-0, MP).
(5)
Set battery switch to OFF.
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24-31-0 Page 506 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/84
STORAGE BATTERY (NICKEL-CADMIUM) - SERVICING
1. General
A. The nickel-cadmium storage battery must be serviced at regular intervals determined by operating conditions. The quantity of water consumed by the battery is determined by operating methods and ambient temperatures.
B. Electrolyte level rises when the battery charges and lowers when the battery discharges. Distilled or demineralized water should be added to battery cells only when battery is fully charged.
C. The only battery servicing allowed while the battery is on the airplane is checking electrolyte level, adding electrolyte, and cleaning spilled electrolyte.
D. Safety Precautions
(1)
Keep any metallic objects such as tools; wire brushes, etc., away from exposed top of battery. Short circuits caused by such objects would be dangerous to personnel.
(2)
Remove spilled electrolyte from hands, clothing or other material immediately with water or 3 percent boric acid solution.
(3)
Never use hydrometers, droppers, syringes, or other tools on a nickel-cadmium battery, which have been in contact with a lead-acid battery.
(4)
Always allow battery to stand idle for 2 to 4 hours with vent caps loosened after being charged so that all gas may escape before adjusting electrolyte level.
(5)
Add only distilled or demineralized water to battery cells. Do not overfill battery.
(6)
Avoid spilling of electrolyte used in nickel-cadmium battery on airplane structure. In event of spillage refer to Corrosion Prevention Manual, Part I section 20-43-00 for approved methods of corrosion removal procedure.
CAUTION: BATTER ELECTROLYTE SPILLAGE SHOULD BE REMOVED AS SOON AS POSSIBLE. IF NOT REMOVED IT CAN CAUSE CORROSIVE DAMAGE TO AIRPLANE STRUCTURE.
2. Equipment and Materials
A. Distilled or demineralized water
B. Liquid measuring container calibrated in cubic centimeters
C. Dropper or syringe with small or finely drawn nozzle
D. Polystyrene tube (open at both ends) approximately 6 inches long x 1/8 inch inside diameter.
3. Service Storage Battery
NOTE: Perform following procedure as soon as possible after last flight before battery is to receive normal periodic servicing.
A. Determine battery state of charge.
(1)
Position DC METERS SWITCH on electrical systems control panel P5 to BAT.
(2)
Place BAT switch on P5 to ON.
(3)
Apply APU or engine driven power to 115V AC ground service bus (generator bus No. 1). Verify that external power is not connected to external power receptacle.
(4)
Open BATTERY CHARGER circuit breaker on P6-4 panel and close after a 2 second delay.
(5)
Observe dc ammeter on P4 upper panel. Battery is fully charged when charger has pulsed for 2 minutes.
(6)
Observe dc ammeter on P4 upper panel. Battery is fully charged when charger has pulsed for 2 minutes.
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Jun 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-31-11 Page 301
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