THERMAL SWITCH - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) Thermal Switch Removal
(2) Thermal Switch Installation
47-AWL-04: ALI
TASK 47-43-02-000-801
2. Thermal Switch Removal
(Figure 401)
A. General
(1) This task has one or more steps which are a means to satisfy Airworthiness Limitation
Instruction (ALI) requirements. An ALI note will follow the step to which it applies. Any step or
sub-step that precedes or follows an ALI identified step is not subject to the ALI requirement.
NOTE: This is applicable to Airworthiness Limitation 47-AWL-04.
NOTE: Replacement of the thermal switch is one option for this Airworthiness Limitation.
B. References
Reference Title
20-10-44-000-801 Lockwire, Cotter Pins, and Lockrings - Removal (P/B 401)
36-00-00-860-806 Remove Pressure from the Pneumatic System (P/B 201)
47-00-00-010-801 Nitrogen Generation System (NGS) Precautions (P/B 201)
C. Location Zones
Zone Area
131 Center Section Wing Box, Body Station 540.00 to Body Station 663.75 - Left
132 Center Section Wing Box, Body Station 540.00 to Body Station 663.75 - Right
212 Flight Compartment - Right
D. Access Panels
Number Name/Location
192BL ECS Ram Air Inlet Mixing Duct Panel - Forward
192CR ECS Access Door
E. Prepare for the Removal
SUBTASK 47-43-02-864-001
(1) Do this task to prepare for the removal: Remove Pressure from the Pneumatic System,
TASK 36-00-00-860-806.
(a) Make sure that the dual duct pressure gage shows less than 0.50 psig (3.45 kPa) in the L
and R pneumatic ducts.
SUBTASK 47-43-02-860-002
(2) Put the L PACK and R PACK selector switches, found on the P5-10 air conditioning panel, to
the OFF position.
(a) Put DO-NOT-OPERATE tags on the L PACK and R PACK selector switches.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
47-43-02
Page 401
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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