(c)  
Turn dc meter selector switch on overhead panel to TEST and set system test module M400 switch S1 to 4 and switch S2 to C and check that no external power contactor coil holding voltage is indicated. 1) Check that dc voltmeter on panel P5-13 reads O.

(d)  
Set switch S2 on power system test module M400 to A, B, and then C. Verify load indication on APU generator ammeter in switch positions A, B, and C.

(e)  
Set switch S2 to B.

(3)  
Test APU power transfer to engine generator No. 1 and No. 2.

(a)  
Set NO. 1 GEN switch to ON and check that No. 1 GEN OFF BUS light extinguishes and that APU GEN OFF BUS light illuminates.

(b)  
Set NO. 2 GEN switch to ON, check that NO. 2 BUS OFF and NO. 2 GEN OFF BUS lights extinguish.

(c)  
Set switch S2 on power system test module M400 to A, B, and then C. Verify load indication on No. 1 and No. 2 generator ac ammeters in switch positions A, B, and C.

(d)  
Set switch S2 to B.

(4)  
Test engine generators No. 1 and No. 2 transfer to ground power.

(a)  Set GRD PWR switch to ON and check that NO. 1 GEN OFF BUS and NO. 2 GEN OFF BUS lights illuminate.

(5)  
Test ground power transfer to engine generators No. 1 and No. 2.

(a)  
Set No. 1 GEN switch to ON and check that NO. 1 GEN OFF BUS light extinguishes.

(b)  
Set No. 2 GEN switch to ON and check that No. 2 GEN OFF BUS light extinguishes.

(6)  
Test engine generators No. 1 and No. 2 transfer to APU power.

(a)  
Set left APU GEN switch to ON, check that NO. 1 GEN OFF BUS light illuminates and that APU GEN OFF BUS light extinguishes.

(b)  
Set right APU GEN switch to ON and check that NO. 2 GEN OFF BUS light illuminates.

(7)  
Test APU power to ground power transfer.

(a)  Set GRD PWR switch to ON and check that APU GEN OFF BUS light illuminates.

(8)  
Test ground power to APU power transfer using right APU GEN switch.

(a)  
Set right APU GEN switch to ON and check that APU GEN OFF BUS light extinguishes and that NO. 1 BUS OFF, ELEC, and MASTER CAUTION lights illuminate.

(b)  
Set right APU GEN switch to OFF and check that NO. 1 and NO. 2 TRANSFER BUS OFF light, No. 1 and 2 BUS OFF lights, NO. 1 and NO. 2 GEN OFF BUS lights and APU GEN OFF BUS light illuminate.

(c)  
Reset MASTER CAUTION lights.

(9)  
Test ground sensing relays interlock using APU power.

(a)  
Set left APU GEN switch to ON and check that APU GEN OFF BUS, No. 1 TRANSFER BUS OFF, No. 2 TRANSFER BUS OFF, and No. 1 BUS OFF lights are extinguished.

(b)  
Press and hold GROUND SENSING test switch on landing gear module.

(c)  
Set right APU GEN switch to ON and check that lights are same as in step (a).

(d)  
Release GROUND SENSING test switch, set right APU GEN switch to ON and check that No. 2 BUS OFF light extinguishes.

(10)
If electrical power is no longer required, restore airplane to normal (par. 6).

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3.  Transfer Bus Control Test
A.  General
(1)  The following test is performed on the transfer bus control when engines and APU are running. If a generator trips off line or power transfer does not occur, trouble shoot generator, GCU and transfer bus relays (Ref 24-21-0 TS).
B.  Prepare for Test
(1)  
Set GEN 1 and GEN 2 switches on panel P5 to ON. Check that No. 1 and 2 TRANSFER BUS OFF, No. 1 and 2 BUS OFF, and No. 1 and 2 GEN OFF BUS lights are extinguished.

(2)  
Load buses 1 and 2 to full available airplane load.

5C2 
Feb 20/86  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  24-21-0 Page 503 

CAUTION:  DO NOT EXCEED 111 AMPS ON ONE ENGINE GENERATOR OR 125 AMPS ON APU GENERATOR AS DAMAGE MAY RESULT.
(a)  
Turn on all lights (except emergency), galleys, air conditioning and fuel boost pumps.

(b)  
Set HYD PUMPS A1 and A2 switches to ON and set HYD PUMPS B1 and B2 switches to ON. Set FLT CONTROL A switch to ON and set FLT CONTROL B switch to ON.

C.  Test Transfer Bus Control
(1)  
Set GEN 1 and GEN 2 switches to OFF. Check that No. 1 and 2 TRANSFER BUS OFF, No. 1 and 2 BUS OFF, and No. 1 and 2 GEN OFF BUS lights illuminate.

(2)  
Set GEN 2 switch to ON. Check that AC voltmeter reads 115 +5 volts ac when meter selector switch is set to GEN 2. Check that No. 1 TRANSFER BUS OFF, No. 2 TRANSFER BUS OFF, No. 2 BUS OFF, and No. 2 GEN OFF BUS lights extinguish.
　
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