CAUTION
WHEN YOU INSTALL THE COUPLINGS, MAKE SURE THE COUPLINGS
DO NOT APPLY A FORCE ON THE DUCTS OR THE INLET COWL TAI
VALVE. DAMAGE TO EQUIPMENT CAN OCCUR.
(f) Do these steps to tighten the coupling [1]:
NOTE: If it is difficult to attach the valve [5] to the adjacent ducts, remove the lockwire
from the link [4] and adjust the links until no force is applied to the ducts or the
valve [5]. Tighten the link [4] and install a MS20995C32 lockwire, G01048.
1) Use a torque wrench, STD-1014, to tighten the coupling [1] to the range specified
on the part.
2) Lightly hit the surface of each coupling [1] with a rubber mallet, STD-3906.
3) Use a torque wrench, STD-1014 to tighten the coupling [1] again to the range
specified on the part.
4) Install the bolts [11] and the nuts [12] that attach the aft duct to the fan case bracket.
a) Use a torque wrench, STD-1014, to tighten the bolts to a torque of 97.0 in-lb
(11.0 N·m) to 103.0 in-lb (11.6 N·m).
SUBTASK 30-21-11-020-005
(4) Connect the connector, DP1303, [10] to the valve [5].
NOTE: Make sure that there is clearance between the TAI valve and adjacent structures.
SUBTASK 30-21-11-760-001
(5) Do these steps to connect the bonding jumper [8] to the valve [5]:
(a) Clean the bonding surface on the valve [5] with alcohol, B00130.
(b) Attach the bonding jumper [8] to the valve [5] with the bolt [6], the washer [7] and the
nut [9].
NOTE: To minimize slack between the two attached lugs of the bonding jumper[8], rotate
the lug at the valve[5] forward and/or the lug on the fan case toward the upward
12 o'clock position of the fan case. Do not allow any riding condition (slack) of the
jumper on the valve or the engine fan case.
1) Use a torque wrench, STD-1014, to tighten the nut [9] to 28.0 in-lb (3.2 N·m) to
35.0 in-lb (4.0 N·m).
(c) Use an intrinsically safe approved bonding meter, COM-1550, to measure the resistance
between the bonding jumper [8] and the valve [5].
1) Make sure the resistance is 0.008 ohms (8.0 milliohms) or less.
I. Engine Cowl TAI Valve Installation Test
SUBTASK 30-21-11-860-009
(1) Remove the safety tags and close these circuit breakers:
CAPT Electrical System Panel, P18-3
Row Col Number Name
A 6 C00148 ANTI-ICE & RAIN ENG 1 & WING CONT
A 7 C01001 ANTI-ICE & RAIN ENG 1 COWL AI VALVE
B 6 C00149 ANTI-ICE & RAIN ENGINE 2 CONTROL
B 7 C01002 ANTI-ICE & RAIN ENG 2 COWL AI VALVE
SUBTASK 30-21-11-840-001
(2) Do these steps to provide pneumatic pressure for the ducts:
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-21-11
Page 408
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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