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24-21-00
ALL ú ú 02 Page 104 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................
| the GCR and | The main power | Do the BITE test for the | Repair the |
| the GCB trip.| wire have an | VSCF. Look for the | circuit in the|
| | open circuit. | AIRCRAFT OPEN PHASE | power wires |
| | | DETECTED light. | between the |
| | | | VSCF and the |
| | | | main ac bus. |
| | | | Replace the |
| | | | GCB if it is |
| | | | necessary |
| | | | (WDM 24-21-11,|
| | | | WDM 24-21-21, |
| | | | WDM 24-22-31, |
| | | | WDM 24-51-11, |
| | | | and |
| | | | WDM 24-51-21).|
| | | | |
| | An overcurrent | Examine the generator | Replace the |
| | fault condition. | feeder wires and the | defective |
| | | loads on the wires for | parts or |
| | | defects. | repair the |
| | | | wires. |
| | | | |
| | The over current | Examine the circuit with | Replace the |
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