S 865-026
 (2)  
Supply external or APU generator power (AMM 24-22-00/201).

 S 715-027

 (3)  
Do the Operational Test:

 (a)  
Turn the dc meters switch on the P5-13 panel to TR3. 1) Make sure that the dc voltmeter shows 26 | 4 volts.

 (b)  
Push the POSITION switch on the P5 overhead panel to the ON BATT or STEADY position.

 NOTE: The POSITION switch is located on the lower right of the
____
 P5 panel.

 1)  Make sure that the dc ammeter indication increases approximately 5 amperes.
 (c)  
Push the POSITION switch to the OFF position.

 1)  Make sure that the dc ammeter indication decreases approximately 5 amperes (returns to its original value).

 (d)  
Turn the dc meters switch to BAT BUS.

 1)  Make sure that the dc voltmeter shows approximately the same voltage as for the TR3 position ( | 0.5 volt).

 (e)  
Push the STANDBY POWER switch to OFF. 1) Make sure that the STANDBY POWER OFF light comes on. 2) Turn the ac meters switch on the P5-13 panel to STBY PWR.

 a) Make sure that the ac voltmeter shows no voltage. 3) Turn the dc meters switch to STBY PWR. a) Make sure that the dc voltmeter shows 0-5 volts.

 (f)  
Push the STANDBY POWER switch to AUTO.

 1)  Make sure these indications occur: a) The STANDBY PWR OFF light goes off b) The dc voltmeter shows 26 | 4 volts c) The ac voltmeter shows 115 | 5 volts d) The frequency meter shows 400 | 5 Hz

 (g)  
Push the GRD PWR switch or the APU GEN No. 1 and No. 2 switches to OFF. 1) Make sure that the STANDBY PWR OFF light comes on. 2) Turn the dc meters switch to these positions and look for

 the correct voltages on the dc voltmeter: a) TR3 - 0 volts
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737-300/400/500MAINTENANCE MANUAL
 b) BAT - 24 |4 volts c) BAT BUS - approximately the same as for the BAT position (| 0.5 volts) d) STBY PWR - 0 volts 3) Turn the ac meters switch to INV. a) Make sure that the ac voltmeter shows no voltage.
 (h) Open the forward access door near the nose landing gear.
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ LEADING EDGE SLATS BEFORE YOU PUT THE AIRPLANE IN THE AIR MODE. THE LEADING EDGE SLATS CAN EXTEND AUTOMATICALLY WHEN YOU PUT THE AIRPLANE IN THE AIR MODE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (i)  Put a deactuator between the ground safety sensor, S105 and its target.
 NOTE: S105 is located near the right main landing gear.
____
 (j)  
Make sure the GROUND SENSING test light on the front panel of the E11 landing gear logic shelf comes on. 1) In the flight deck, make sure these indications occur:

 a) The STANDBY PWR OFF light goes off. b) The dc voltmeter shows 24 | 4 volts c) The ac voltmeter shows 115 | 5 volts d) The frequency meter shows 400 | 5 Hz

 (k)  
Remove the deactuator between the ground safety sensor, S105 and its target. 1) Make sure that the STANDBY POWER OFF light comes on.

 (l)  
Close the forward access door.

 (m)  
Push the STANDBY POWER switch to BAT. 1) Make sure that the STANDBY PWR OFF light goes off. 2) Make sure that the dc voltmeter shows 24 | 4 volts.

 E. Put the System Back to its Usual Condition.
 S 865-028
 (1)  
Push the STANDBY POWER switch to AUTO.

 S 865-029

 (2)  
Push the GRD PWR switch or the APU GEN No. 1 and No. 2 switches to ON.

 (3)  
Make sure that the battery is fully charged.

 S 765-030
 NOTE: For more details about the operation of the battery charger,
____
 (AMM 24-31-21/501).

 S 865-032
 (4)  Turn the dc meters switch to TR1.
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