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ELECTRICAL POWER - OPERATION - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Built-In Test Equipment (BITE)
These electrical power components have BITE:
* Electrical meters, battery, and galley power module
* Generator control units (GCUs)
* Bus power control unit (BPCU).
Electrical Meters, Battery, and Galley Power Module BITE
The electrical meters, battery, and galley power module has
front face BITE for the standby power system and the DC
generation system. The module also monitors for internal
module faults and wiring interface failures. Fault messages
show on the module’s LED alphanumeric display. See the
TRAINING INFORMATION POINT - 2 page in this section for
more information.
See the DC generation section for more information.
(SECTION 24-30)
See the standby power system section for more information.
(SECTION 24-34)
GCU BITE
Each GCU has front face BITE for the AC generation system.
Front panel lights come on to show faults. See section the AC
generation system section for more information on GCU BITE.
(SECTION 24-20)
BPCU BITE
The BPCU has front face BITE for the external power system.
Front panel lights come on to show faults. See the external
power section for more information. (SECTION 24-40)
ELECTRICAL POWER - TRAINING INFORMATION POINTS - 1
EFFECTIVITY
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ELECTRICAL POWER - TRAINING INFORMATION POINTS - 1
EFFECTIVITY
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ELECTRICAL POWER - TRAINING INFORMATION POINTS - 1
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
ELECTRICAL POWER - TRAINING INFORMATION POINTS - 1
24-00-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Electrical Meters, Battery, and Galley Power Module Built-In
Test
The fault information shows on the electrical meters, battery,
and galley power module. The amber ELEC light on the module
comes on when the module has an electrical system fault
message. The light does not come on in flight. Messages show
on the LED alphanumeric display when the airplane is on the
ground and you push the MAINT switch.
These are the fault messages that can show:
* PANEL FAILURE (soft, display operates)
* INTERFACE FAILURE
* BAT CHGR INOP
* STAT INV INOP
* SPCU INOP.
The letter I may follow the fault message. This means that the
fault is intermittent and that the fault is not set at this time.
You do these to see a fault message:
* Put the AC and DC meter selector switches to the TEST
position
* Temporarily push the MAINT switch.
All of the segments of the LED alpha numeric display come on
(display test) immediately after you release the switch. The time
to do the test is approximately 15 seconds. Then, the first
message shows on the display. You temporarily push the
switch again to see the next message. If there are no
messages, NO FAULTS STORED temporarily shows after the
display test is complete. The display then goes blank. The
display stays blank until you move a selector switch.
You see HOLD BUTTON CLEAR FAULTS on the display when
you temporarily push the switch after the last fault message. To
erase all of the message from memory, you must push and hold
the switch until the FAULTS CLEARED message shows. The
HOLD UNTIL FAULTS CLEAR message shows during this time.
The fault messages will stay in memory and the display will go
blank if you release the switch before the FAULTS CLEARED
message shows. The display goes back to normal when you
move a selector switch.
Training Information Point
　
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