CURRENT TRANSFORMER - REMOVAL/INSTALLATION
1. General
A. This procedure has two tasks:
(1) The first task removes any of the following current transformers:
(a) GEN 1 DIFFERENTIAL PROTECTION CURRENT TRANSFORMER (DPCT), T374
(b) GEN 2 DIFFERENTIAL PROTECTION CURRENT TRANSFORMER (DPCT), T375
(c) APU DIFFERENTIAL PROTECTION CURRENT TRANSFORMER (DPCT), T376
(d) EXT PWR CURRENT TRANSFORMER (CT), T378
(2) The second task installs any of these current transformers.
TASK 24-21-71-000-801
2. Current Transformer Removal
(Figure 401)
A. General
(1) These current transformers are located in the Rigid Bus Assemblies which are installed in the
back of the P91 and P92 Power Distribution Panels.
NOTE: If the troubleshooting points to a defective current transformer, the airline must remove
and send back the rigid bus assembly to Honeywell. Write or speak to Honeywell for
more data.
(2) You get access to the current transformers from the forward cargo area.
(3) The current transformers are located as follows:
(a) GEN 1 DPCT, T374 - P91 Panel
(b) GEN 2 DPCT, T375 - P92 Panel
(c) APU DPCT, T376 - P91 Panel
(d) EXT PWR CT, T378 - P92 Panel
B. References
Reference Title
24-22-00-860-812 Remove Electrical Power (P/B 201)
C. Location Zones
Zone Area
121 Forward Cargo Compartment - Left
122 Forward Cargo Compartment - Right
D. Prepare for Removal
SUBTASK 24-21-71-860-001
WARNING
REMOVE ELECTRICAL POWER BEFORE REMOVAL OR INSTALLATION OF
THE CURRENT TRANSFORMERS IN THE POWER DISTRIBUTION PANELS.
HIGH VOLTAGES PRESENT CAN CAUSE INJURY TO PERSONS.
(1) Do this task: Remove Electrical Power, TASK 24-22-00-860-812.
(a) Make sure that all of the power warning lights on the power distribution panel are off.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-21-71
Page 401
D633A101-ILF Oct 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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