SUBTASK 47-11-04-100-001
(4) Make sure that the air supply duct [5], bonding jumper [2], coupling [7], clamp [8], and
sleeve [6] are clean and free from grease and unwanted material (TASK 20-30-80-910-801).
SUBTASK 47-11-04-765-001
(5) Prepare the contact surfaces of these components for an electrical mating surface bond
(SWPM 20-20-10):
(a) bond jumper tab [15]
(b) bonding jumper [2]
SUBTASK 47-11-04-430-001
(6) Do these steps to install the two new o-rings [4]:
(a) Wet the o-rings [4] with water.
(b) Put the two o-rings [4] in the cavities on the overtemperature shutoff valve [1] and the air
supply duct [5].
SUBTASK 47-11-04-430-002
(7) Do these steps to install the new o-ring [9]:
WARNING
KRYTOX 240AC IS AN AGENT THAT IS POISONOUS AND AN IRRITANT.
MAKE SURE ALL PERSONS OBEY THE PRECAUTIONS WHEN KRYTOX
240AC IS USED.
• DO NOT USE IN AREAS WHERE THERE IS HIGH HEAT, SPARKS, OR
FLAMES.
• CLOSE THE CONTAINER WHEN NOT USED.
• DO NOT GET KRYTOX 240AC IN THE EYES, ON THE SKIN, OR ON
YOUR CLOTHES.
• DO NOT BREATHE THE GAS.
• DO NOT EAT KRYTOX 240AC.
(a) Apply a thin layer of Krytox 240AC perfluoropolyether grease, D50063 or water, to the
o-ring [9].
NOTE: Too much Krytox 240AC perfluoropolyether grease, D50063 can leak into the
ASM and cause damage to the ASM.
(b) Put the o-ring [9] in the cavity on the air separation module [10].
G. Install the Overtemperature Shutoff Valve
SUBTASK 47-11-04-420-001
(1) Do these steps to install the overtemperature shutoff valve [1]:
(a) Hold the overtemperature shutoff valve [1] in its position.
(b) Attach, but do not fully tighten, the overtemperature shutoff valve [1] to the air separation
module [10] with the clamp [8].
(c) Align the overtemperature shutoff valve [1] with the air supply duct [5].
(d) Put the sleeve [6] in its position.
(e) Install the coupling [7].
(f) Tighten the clamp [8] to 47.5 ±2.5 in-lb (5.4 ±0.3 N·m).
NOTE: This procedure requires a different torque value to the value that is printed on the
clamp [8].
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-11-04
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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