E. Prepare for the Installation
SUBTASK 30-21-21-860-005
(1) Make sure that these circuit breakers are open and have safety tags:
CAPT Electrical System Panel, P18-3
Row Col Number Name
A 6 C00148 ANTI-ICE & RAIN ENG 1 & WING CONT
B 6 C00149 ANTI-ICE & RAIN ENGINE 2 CONTROL
SUBTASK 30-21-21-010-008
(2) If not already done, do this task: Remove Pressure from the Pneumatic System,
TASK 36-00-00-860-806.
SUBTASK 30-21-21-010-007
(3) If not already done, do this task: Open the Fan Cowl Panels, TASK 71-11-02-010-801-F00.
F. Engine Anti-Ice Pressure Sensor Installation
SUBTASK 30-21-21-420-002
(1) Loosely install the TAI pressure switch [4] in the saddle clamp [6] with the clamp [3] and
bolts [2].
NOTE: Do not tighten the bolts [2] at this time.
SUBTASK 30-21-21-820-001
(2) Position the TAI pressure switch [4] such that the electrical connector [5] master keyway is
furthest away from the duct.
SUBTASK 30-21-21-420-003
(3) Connect the electrical connector [5] to the TAI pressure switch [4].
SUBTASK 30-21-21-420-005
CAUTION
HOLD THE FITTING ON THE PRESSURE SWITCH IN PLACE WITH A
SECOND WRENCH WHEN YOU CONNECT THE TUBE. IF YOU DO NOT
HOLD THE FITTING IN PLACE YOU WILL DAMAGE THE TAI PRESSURE
SWITCH.
(4) Connect the elbow to the TAI pressure switch [4].
SUBTASK 30-21-21-420-006
CAUTION
WHEN YOU TIGHTEN THE TUBE ASSEMBLY, HOLD THE FITTING ON THE
PRESSURE SWITCH IN PLACE WITH A SECOND WRENCH. IF YOU DO NOT
HOLD THE FITTING IN PLACE YOU WILL DAMAGE THE TAI PRESSURE
SWITCH.
(5) Tighten the elbow to 256.5 in-lb (29.0 N·m) to 283.5 in-lb (32.0 N·m).
SUBTASK 30-21-21-420-008
(6) Tighten the bolts [2] on the clamp [3] to 50.0 in-lb (5.6 N·m) to 56.0 in-lb (6.3 N·m).
SUBTASK 30-21-21-860-003
(7) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-2
Row Col Number Name
B 4 C01003 ENGINE 1 THRUST REVERSER IND
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-21-21
Page 406
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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