(b) Open these circuit breakers and install safety tags:
F/O Electrical System Panel, P6-4
Row Col Number Name
F 12 C01285 GENERATOR APU GEN CONT UNIT
Power Distribution Panel Number 2, P92
Row Col Number Name
C 9 C01326 APU GEN CONT UNIT
SUBTASK 24-21-81-860-002
(3) If you are going to remove GCU 1, G10, do the steps that follow:
(a) Remove power from IDG 1. To remove IDG power, do this task: Remove IDG Power,
TASK 24-22-00-860-818.
(b) Open this circuit breaker and install safety tag:
F/O Electrical System Panel, P6-4
Row Col Number Name
F 10 C01283 GENERATOR CONT UNIT 1
SUBTASK 24-21-81-860-003
(4) If you are going to remove GCU 2, G12, do the steps that follow:
(a) Remove power from IDG 2. To remove IDG power, do this task: Remove IDG Power,
TASK 24-22-00-860-818.
(b) Open this circuit breaker and install safety tag:
F/O Electrical System Panel, P6-4
Row Col Number Name
F 11 C01284 GENERATOR CONT UNIT 2
G. Generator Control Unit Removal
SUBTASK 24-21-81-910-001
CAUTION
DO NOT TOUCH THE CONTROL UNIT BEFORE YOU DO THE PROCEDURE
FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE.
ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CONTROL
UNIT.
(1) Before you touch the GCU [1], do this task: ESDS Handling for Metal Encased Unit Removal,
TASK 20-40-12-000-802.
SUBTASK 24-21-81-020-001
(2) Remove the GCU [1], do this task: E/E Box Removal, TASK 20-10-07-000-801.
END OF TASK
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-21-81
Page 404
D633A101-ILF Oct 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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