SUBTASK 47-43-01-430-001
(2) Install the nut [4] on the pressure switch [1].
(a) Continue to turn until the nut [4] is on the pressure switch [1] side of the o-ring [5] cavity.
SUBTASK 47-43-01-420-006
(3) Install the washer [8] on the pressure switch [1], to the position between the nut [4] and O-ring
cavity.
SUBTASK 47-43-01-640-001
(4) Lubricate the new o-ring [5] with water.
SUBTASK 47-43-01-430-002
(5) Install the new o-ring [5] in the O-ring cavity on the pressure switch [1].
SUBTASK 47-43-01-420-002
(6) Install the pressure switch [1] into the boss [7] on the duct [6].
(a) Continue to turn the pressure switch [1] until the o-ring [5] is in its position in the top of
the boss [7].
SUBTASK 47-43-01-420-004
(7) Do these steps to install the sense line [3]:
(a) Align the pressure switch [1] with the sense line [3].
(b) Apply corrosion inhibiting material, G50136, on the treads.
(c) Connect the sense line [3] to the pressure switch [1].
NOTE: Use a second wrench on the pressure switch [1] when you tighten the sense
line [3].
SUBTASK 47-43-01-430-004
(8) Tighten the nut [4] to 90 ±3 in-lb (10.2 ±0.4 N·m).
NOTE: Use a second wrench on the boss [7] when you tighten the pressure switch [1].
NOTE: This torque value is in addition to the torque necessary to overcome the self-locking
devices.
SUBTASK 47-43-01-420-005
(9) Install the lockwire between the boss [7] and nut [4].
SUBTASK 47-43-01-420-003
(10) Connect the electrical connector [2].
SUBTASK 47-43-01-410-002
(11) Do these steps to install the ram air valve exhaust hose:
(a) Put the clamps on the hose.
1) Make sure you can get access to the clamp screws.
(b) Install the hose on the ram air exhaust duct.
1) Tighten the clamp.
(c) Install the hose on the ram air valve exhaust port.
1) Tighten the hose clamp.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-43-01
Page 407
D633A101-ILF Oct 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ILF 402, 452, 509, 510, 523, 525-528, 568, 569, 576, 577, 581, 583, 585, 588-590,
592-599, 601-603, 606, 607, 610-615, 620, 625-627, 691-699, 833-835, 838, 971, 980-999;
ILF 101, 151, 156-199, 301, 304, 308, 310, 314, 315, 317-319, 323, 331-399, 401, 405,
406, 409, 410, 412, 416, 424, 425, 427-429, 451, 501-504, 507, 508, 512-514, 516, 518,
524, 531-533, 535-537, 541, 542, 552-556, 560-562, 567, 571-575, 671, 672, 686, 703,
707-710, 803-813, 821, 822, 831, 832, 836, 837, 841, 842, 851, 852, 854-858, 861-863,
871-874, 947, 948, 968-970, 972, 973 POST SB 737-47-1003
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