(a) Put the high flow valve on a clean surface.
NOTE: Use a vise, STD-4373, to fasten the high flow valve to the surface, if it is
necessary.
(b) Remove the protective covers from the high flow valve.
(c) Make sure that the threaded flanges, nuts, tubes, and the high flow valve are clean and
free from grease, solvents and unwanted material.
(d) To clean the components, do this task: General Cleaning of Metal (Series 80),
TASK 20-30-80-910-801.
(e) Remove the protective shipping caps from the new pressure sensor [1].
(f) Use a clean, solvent free, cotton wiper, G00034, to clean the mating surfaces of the
pressure sensor [1].
I. Install the Pressure Sensor
SUBTASK 47-42-02-430-001
(1) Do these steps to install the pressure sensor [1]:
(a) Apply a thin layer of Krytox 240AC perfluoropolyether grease, D50063, to the new
o-ring [3].
(b) Install the new o-ring [3] on the tube assembly [4].
(c) Insert the tube assembly [4] and the o-ring [3] into the high flow valve.
(d) Apply a thin layer of compound, C00852, to the pressure sensor [1] threads.
(e) Install the new pressure sensor [1] in its position on the bracket:
1) Put the jamnut [6] on the pressure sensor [1].
NOTE: You must connect the tube assembly [4] to the pressure sensor [1] when
you install the pressure sensor [1] on the high flow valve.
2) Install, but do not tighten, the nut [5].
3) Install, but do not tighten, the nut on the sense line [2].
4) Tighten the jamnut [6] to 135 ±15 in-lb (15 ±2 N·m).
5) Tighten the nut on the sense line [2] to 230 ±15 in-lb (26 ±2 N·m).
6) Tighten the nut [5] on the tube assembly [4] to 230 ±15 in-lb (26 ±2 N·m).
J. Install the High Flow Valve (If Removed)
SUBTASK 47-42-02-420-001
(1) Install the high flow valve (TASK 47-11-02-420-801).
K. Operational Test of the Altitude Sensor
SUBTASK 47-42-02-865-003
(1) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-3
Row Col Number Name
ILF 402, 452, 509, 510, 523, 525-528, 576, 577, 971; 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
D 17 C01657 NITROGEN GEN CONT
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-42-02
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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