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24-21-0 Page 114 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 01/96
AC GENERATION SYSTEM - ADJUSTMENT/TEST
1. General
A. The following procedure consists of four tests; par. 2 is the AC generation system test, par. 3 is the transfer bus control test, par. 4 is the galley service power load shedding test and par. 5 is the "B" hydraulic system power source transfer test.
2. AC Generation System Test
A. General
(1) The following system test consists of several subsystem tests. Before beginning these subsystems tests, make sure all meters display and operate correctly, and test press-to-test lights on electrical systems control panel. The electrical system should be prepared as for a normal flight with all components in readiness to be started and loaded. The loads used are from the system B hydraulic pumps.
B. Test External Power and Control Circuits
(1)
Connect external power to P19 receptacle. Check that GRD POWER AVAILABLE light on panel P5 illuminates.
(2)
Set BAT switch on forward overhead panel P5 to ON.
(3)
Check that STANDBY POWER and BUS TRANS switches on panel P5 are set to AUTO.
(4)
Check that the following lights illuminate:
(a)
NO. 1 and NO. 2 TRANSFER BUS OFF (P5 ovhd panel)
(b)
NO. 1 and NO. 2 BUS OFF (P5 ovhd panel)
(c)
NO. 1 and NO. 2 GEN OFF BUS (P5 ovhd panel)
(d)
ELEC and MASTER CAUTION (P7 lightshield panel)
(5)
Reset MASTER CAUTION lights.
(6)
Turn meter selector switch on P5 panel to GRD PWR.
(a)
Check that voltmeter reading is 115 +5 volts ac.
(b)
Check that frequency meter reading is 400 +10 Hz.
C. Test Auxiliary Power Unit (APU) Generator and Control Circuits
(1)
Start APU (Ref 49-11-0 MP), check that APU GEN OFF BUS light illuminates as APU reaches normal running speed, and turn ac meter selector switch to APU GEN.
(a)
Check that voltmeter reading is 115 +5 volts ac.
(b)
Check that frequency meter reading is 405-410 Hz with APU generator loaded.
(2)
Set left and right APU GEN switch to ON and then to OFF.
(a) Press RESID VOLT switch and check that ac voltmeter reads 10 to 21 volts ac.
(3)
Check APU alternate power source circuit.
(a)
Open APU CONT circuit breaker on P6-5 panel. Check that APU does not shutdown by checking that meters read same as in (1)(a) and (b).
(b)
Close APU CONT circuit breaker.
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May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-21-0 Page 501
D. Test Engine Generator No. 1 and Control Circuits
(1)
Start engine No. 1 (Ref 71-09-100, Operating Procedure) and turn ac meter selector switch to GEN 1 and verify that CSD LOW OIL PRESSURE light extinguishes.
(2)
Set GEN 1 switch to ON and then to OFF.
(a) Press RESID VOLTS switch and check that ac voltmeter reading is 10 to 21 volts ac.
(3)
Set GEN 1 switch to ON and check that ac voltmeter reading is 115 +5 volts ac, indicating that control (field) relay has closed. Check that No. 1 and 2 TRANSFER BUS OFF, No. 1 BUS OFF, and No. 1 GEN OFF BUS lights extinguish.
(4)
Set No. 1 and 2 HYD PUMP system B switches on P5 panel to ON and check that CSD LOW OIL PRESSURE light remains extinguished.
(5)
Check that frequency is 400 +5 Hz.
E. Test Engine Generator No. 2 and Control Circuits
(1) Start engine No. 2 (Ref 71-09-100, Operating Procedure), and turn ac meter selector switch to GEN 2, verify that CSD LOW OIL PRESSURE light extinguishes, and repeat 2.D.(2), (3) and (5) for GEN 2.
(a) Check that No. 2 BUS OFF and No. 2 GEN OFF BUS lights extinguish.
F. Test AC Power Source Transfer and Control Circuits
(1)
With external power connected and all generators running, set GND PWR switch to ON. Check that No. 1 GEN OFF BUS, No. 2 GEN OFF BUS, and APU GEN OFF BUS lights illuminate.
(2)
Test ground power to APU power transfer using left APU GEN switch.
(a)
Set left APU GEN switch to ON, check that APU GEN OFF BUS light extinguishes and that NO. 2 BUS OFF light, ELEC light and MASTER CAUTION lights illuminate.
(b)
Reset MASTER CAUTION lights.
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