TASK 24-52-01-400-801
3. 28-Volt AC Transformer Installation
Figure 401
A. General
(1) The 28-Volt AC Transformer is installed in the P18 Circuit Breaker Panel. Refer to WDM
24-53-11.
B. References
Reference Title
WDM 24-53-11 Wiring Diagram Manual
C. Location Zones
Zone Area
221 Passenger Compartment - Aft of Control Compartment to Forward Entry Door - Left
D. Install the 28-Volt AC Transformer
SUBTASK 24-52-01-420-001
(1) Install the transformer [1]:
(a) Put the transformer [1] in its position on the panel.
(b) Install the four bolts [6] and the washers [5] that attach the transformer to the panel.
(c) Tighten the bolts [6].
SUBTASK 24-52-01-420-002
(2) Connect the electrical leads:
(a) Remove the nuts [4] and the washers [3] from the terminal studs on the transformer [1].
(b) Connect the electrical leads to the terminal studs on the terminal.
(c) Install the washers [3] and nuts [4] on the terminal studs.
(d) Tighten the nuts [4].
(e) Remove the identification tags from the electrical leads.
SUBTASK 24-52-01-410-001
(3) Close the P18 circuit breaker panel.
SUBTASK 24-52-01-860-002
(4) Close the applicable circuit breaker:
Remove the safety tag and close this circuit breaker:
CAPT Electrical System Panel, P18-3
Row Col Number Name
C 5 C02046 28V AC XFR BUS 1 SECT 2
E. Installation Test of the 28-Volt AC Transformer
ILF 401, 405, 406, 409, 410, 412, 416, 424, 425, 427-429, 451, 491, 492, 494-500, 502, 504, 507, 512,
513, 515, 518-520, 530-533, 535, 537, 541, 542, 556, 557, 559, 563, 564, 703, 821, 822, 831, 947
SUBTASK 24-52-01-710-001
(1) Do a test of the Passenger Cabin Signs:
(a) At the pilots overhead panel, P5, set the switches for the passenger signs to the on
mode.
1) Make sure the sign comes on correctly.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-52-01
Page 404
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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