E. Supply power to ground service buses only.
(1)
Install external power cable per 2.C.(1),(2), and (3).
(2)
Place GROUND SERVICE switch on forward attendant's panel P13 to ON.
NOTE: GROUND POWER switch overrides GROUND SERVICE switch and deactivates GROUND SERVICE switch when placed to ON.
F. Remove power from ground service buses.
(1)
Place GROUND SERVICE switch to OFF.
(2)
Remove external power cable per 2.D.(3) and (4).
3. Apply APU Generator Power
A. General
(1) APU power may be used to power 115V ac generator bus 1, 115V ac generator bus, or both buses.
CAUTION: LIMIT CURRENT DRAIN FROM GENERATOR TO 165 AMPS. FAILURE TO DO SO MAY RESULT IN DAMAGE TO GENERATOR.
B. Apply power to buses.
(1)
Place BAT switch on electrical systems control panel P5 to ON.
(2)
Check that BUS TRANS switch on P5 is set to AUTO.
(3)
Start APU (Ref 49-11-0 MP).
(a)
Observe that TRANSFER BUS OFF, BUS OFF, and GEN OFF BUS lights above both GEN 1 and GEN 2 switches on panel P5 illuminate.
(b)
After 15-30 seconds to allow APU to reach normal operating speed, observe that APU GEN OFF BUS light on P5 illuminates.
(4)
Place INDICATE/TEST switch on annunciator lights module M238 on load control center right P6 to TEST.
(a) Observe that HV, LV, FF, and MT lights located below APU on module M238 illuminate while switch is held in place and extinguish when switch is released.
(5)
Press ERASE switch on module M238.
(6)
Place AC meters selector switch on panel P5 to APU GEN.
(a) Observe that voltmeter reads 115 ±5 volts ac and that frequency meter reads 400 ±5 Hz with APU generator loaded.
(7)
Apply power to 115V ac generator bus 1 by placing left APU GEN switch on panel P5 to ON and apply power to 115V ac generator bus 2 by placing right APU GEN switch to ON.
(a) Observe that TRANSFER BUS OFF, BUS OFF, and APU GEN OFF BUS lights on P5 extinguish.
C. Remove power from buses.
(1)
Place both APU GEN switches to OFF.
(a) Observe that TRANSFER BUS OFF, BUS OFF, and APU GEN OFF BUS lights on P5 illuminate.
(2)
Shutdown APU (Ref 49-11-0 MP).
(3)
Place BAT switch on P5 to OFF.
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Oct 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-22-0 Page 203
4. Apply Engine-Driven Generator Power
A. General
(1) Engine-driven generator power may be used to power all buses except external power buses. Each ac generator bus may be powered individually with one engine operating.
B. Apply power to buses.
(1)
Place BAT switch on electrical systems control panel P5 to ON.
(2)
Check that BUS TRANS switch on P5 is set to AUTO.
(3)
Operate engine (Ref 71-09-100, Operating Procedure).
(a)
Observe that TRANSFER BUS OFF, BUS OFF, and GEN OFF BUS lights above GEN1 switch on panel P5 when operating engine 1 and above GEN2 switch when operating engine 2 illuminate.
(b)
Observe that LOW OIL PRESSURE light on P5 extinguishes.
NOTE: Idle engine for 3 minutes to allow CSD to reach operating temperature.
(4)
Place INDICATE/TEST switch on annunciator lights module M238 on load control center right P6 to TEST.
(a) Observe that HV, LV, FF, and MT lights located below GEN 1 for engine 1 or GEN 2 for engine 2 illuminate while switch is held in place and extinguish when switch is released.
(5)
Press ERASE switch on M238 module.
(6)
Place AC meters selector switch on panel P5 to GEN 1 or GEN 2, as applicable.
(a) Observe that voltmeter on panel P5 reads 115 ±5 volts ac and frequency meter reads 400 ±10 Hz nominal.
(7)
With engine 1 operating, apply power to 115V ac generator bus 1 by placing GEN 1 switch to ON. With engine 2 operating, apply power to 115V ac generator bus 2 by placing GEN 2 switch to ON.
(a) Observe that TRANSFER BUS OFF, BUS OFF, and GEN OFF BUS lights on P5 extinguish.
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