24-22-00
ALL ú ú 01 Page 205 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
WARNING: IF THE EXTERNAL POWER SUPPLY HAS AN EARTH GROUNDED
_______ NEUTRAL, THERE MUST NOT BE AN OPEN OR FLOATING GROUND IN THE NEUTRAL CIRCUIT WIRING OF THE SUPPLY OR THE AIRPLANE. IF AN OPEN OR FLOATING GROUND IS PRESENT, THE AIRPLANE CAN BE PUT AT AN ELECTRICAL POTENTIAL ABOVE EARTH GROUND. THIS ELECTRICAL POTENTIAL CAN RESULT ELECTRIC SHOCK WITH POSSIBLE SEVERE INJURY TO PERSONNEL WHO TOUCH THE AIRPLANE.
(b) Make sure the external power supply operates correctly before you supply external power to the airplane. 1) If the ground return (neutral) circuit on the external
power supply or the external power receptacle does not operate correctly, do this task: Static grounding (AMM 24-41-01/401).
WARNING: REMOVE THE ELECTRICAL POWER FROM THE EXTERNAL POWER CABLE
_______ BEFORE YOU CONNECT THE CABLE TO THE AIRPLANE. INJURY TO PERSONS CAN BE CAUSED BY AN ELECTRICAL SHOCK.
(c)
Install the power cable in the external power receptacle.
(d)
Use a cargo tie down to support the cable.
(e)
Energize the power cable.
(f)
Make sure these white lights on the P30 panel are on:
1) The CONNECTED light.
2) The NOT IN USE light.
(g)
Push the BAT switch on the pilots' overhead panel P5 to the ON position.
(h)
Make sure the white AVAIL light in the EXT PWR switch P5 is on.
(i)
Push the EXT PWR switch on the P5 panel. 1) Make sure the white ON light in the switch comes on.
(j)
Make sure the NOT IN USE light in the P30 panel is off.
(k)
Make sure the BUS TIE switches on the P5 panel are in the AUTO position. 1) Make sure the L BUS and the R BUS off lights are off.
(l)
Do these steps to supply power to the utility/galley buses: 1) Push the applicable L or R UTILITY BUS switch on the P5
panel to the ON position. 2) Make sure the yellow OFF light in the switch goes off.
S 862-040
(7) Do these steps to remove the External Power from the 115v ac buses:
(a)
Push the EXT PWR switch on P5 panel and make sure the white ON light in the switch goes off.
(b)
Make sure the yellow (L BUS) BUS OFF light on P5 is on.
(c)
Make sure the yellow (R BUS) BUS OFF light on P5 is on.
(d)
Push the BAT switch on P5 to the off position.
(e)
Make sure the white NOT IN USE light on P30 is on.
(f)
Remove the power from the external power cable.
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24-22-00
ALL ú ú 01 Page 206 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
(g) Make sure the CONNECTED and the NOT IN USE lights on P30 are off.
WARNING: REMOVE THE ELECTRICAL POWER FROM THE EXTERNAL POWER CABLE
_______ BEFORE YOU REMOVE THE CABLE FROM THE AIRPLANE. INJURY TO PERSONS CAN BE CAUSED BY AN ELECTRICAL SHOCK.
(h)
Remove the external power cable.
(i)
Close the cover on the P30 panel.
TASK 24-22-00-862-002
3. Supply and Remove APU Generator Power
_____________________________________
A. General
(1)
This task has these parts:
(a)
Supply the APU generator power to the ground handling bus.
(b)
Remove the APU generator power from the ground handling bus.
(c)
Supply the APU generator power to the ground service bus.
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