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 to the external power receptacle.
(d) Energize the external power cable.
(e) Make sure these lights on the external power panel, P19 are on:
1) EXTERNAL PWR CONN
2) EXTERNAL PWR NOT IN USE
(f) Make sure the GRD POWER AVAILABLE light on the P5-4 panel comes on.
(g) Push the GROUND SERVICE switch on the FWD ATTENDANT panel, P13.
1) Make sure the light in the GROUND SERVICE switch comes on.
(h) Make sure the EXTERNAL PWR NOT IN USE light on the P19 panel is off.
NOTE: The ground service buses energizes when the external power is supplied to the
receptacle and the GROUND SERVICE switch is set to ON.
SUBTASK 24-22-00-860-005
(2) Do these steps to supply external power to the 115V AC transfer buses:
NOTE: The ground service buses are energized automatically when external power is
supplied to the 115V AC transfer bus 1 and the 115V AC transfer bus 2.
(a) Open the External Power Receptacle Door.
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 CAUSE 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 do not operate correctly, do this task: Static Grounding,
TASK 20-40-11-910-801.
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 to the external power receptacle.
(d) Energize the external power cable.
(e) Make sure these lights on the external power panel, P19 are on:
1) EXTERNAL PWR CONN
2) EXTERNAL PWR NOT IN USE
(f) Set the BAT switch located on the P5-13 panel to the ON position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-22-00
Page 203
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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