F. Procedure
ILF 401, 406, 409, 410, 412, 416 PRE SB 737-24-1128
SUBTASK 24-21-71-420-001
(1) AIRPLANES WITH OLD RIGID BUS ASSEMBLIES (PRE- SB 24-1128) (PRE - PRR 38317);
do the steps that follow to install the current transformer [10]:
(a) Hold the current transformer [10] in position.
(b) Install the screw [8] and washer [9] that hold the current transformer to the rigid bus
assembly.
(c) Tighten the screw [8] to 19 ±1 in-lb (2 ±0 N·m).
(d) Install the electrical connector on the current transformer and tighten the two screws.
(e) Install the three terminal studs [7], wires, screws [12] and washers [11].
NOTE: Loosely install the screws so that the terminal studs can be moved into position
when the cover [3] is installed.
(f) Install the cover [3] on the rigid bus assembly so that all of the terminal studs [7] fit
through the holes in the cover [3].
NOTE: Make sure that the bushings [6] are installed between each terminal stud [7] and
the cover [3].
(g) Install the three screws [4] and washers [5] that hold the cover [3].
(h) Tighten the screws [4] to 48 ±2 in-lb (5 ±1 N·m).
(i) Tighten the three screws [12] to 25 ±1 in-lb (3 ±0 N·m).
NOTE: Use the access holes in the cover [3] located just above the terminal studs, to
tighten these screws.
(j) Install the aft two screws and washers that hold the cooling duct assembly to the bottom
of the cover [3]. Tighten all four screws that hold the duct to the rigid bus assembly.
ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 402, 405, 424, 425,
427-429, 451, 452, 491-504, 507-510, 512-516, 518-520, 523-528, 530-533, 535-537, 541, 542, 552-557,
559-564, 567-569, 571-577, 581, 583, 585, 588-590, 592-599, 601-603, 606, 607, 610-615, 620,
625-627, 671, 672, 686, 691-699, 703, 707-710, 803-813, 821, 822, 831-838, 841, 842, 851, 852,
854-858, 861-863, 871-874, 947, 948, 968-973, 980-999; ILF 401, 406, 409, 410, 412, 416 POST SB
737-24-1128
SUBTASK 24-21-71-420-003
(2) AIRPLANES WITH NEW RIGID BUS ASSEMBLIES (POST- SB 24-1128) (POST - PRR
38317); do the steps that follow to install the current transformer [10]:
(a) Hold the current transformer [10] in position.
(b) Install the screw [8] and washer [9] that hold the current transformer to the rigid bus
assembly.
(c) Tighten the screw [8] to 19 ±1 in-lb (2 ±0 N·m).
(d) Install the electrical connector on the current transformer and tighten the two screws.
(e) Put the three terminal studs [7] and retainer [14] in position. Install the wires, screws [12]
and washers [11].
NOTE: Loosely install the screws [12], they will be tightened after the cover [3] is
installed.
NOTE: The torque for the three screws [16] that hold the retainer [14] to the terminal
studs [7] is 1.5 ±0.5 in-lb (0.2 ±0.1 N·m).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-21-71
Page 414
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF ALL
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