(d) Tighten the retaining screw to 20 ±1 in-lb (2.26 ±0.11 N·m).
F. Put the Engine Anti-Ice Valve Inoperative Open
NOTE: Dispatching with an engine and nose cowl anti-ice valve inoperative open will cause the
associated COWL VALVE OPEN light to illuminate bright blue on the P5-11 panel and the
associated Thermal Anti-Ice (TAI) indication to illuminate amber on the flight deck common
display system (CDS).
SUBTASK 30-00-00-210-002
(1) To manually position the valve in the OPEN position, do these steps:
(a) Loosen the retaining screw on the manual locking assembly.
(b) Move the hex shaft to the OPEN position:
(c) Slide the locking assembly up the shaft into the recess in the cover plate.
(d) Tighten the retaining screw 20 ±1 in-lb (2.26 ±0.11 N·m).
SUBTASK 30-00-00-020-006
(2) Disconnect, cap and stow the DP1302 ELECTRICAL CONNECTOR [3] on the ANTI-ICE
PRESSURE SWITCH [4], Figure 902.
SUBTASK 30-00-00-860-010
(3) Close the HIGH STAGE VALVE [5] from the 9th stage bleed air source, Figure 903:
NOTE: Only one high stage valve may be locked in the closed position for dispatch. Dispatch
with the opposite high stage valve inoperative under MMEL item 36-9 is not allowed.
(a) Manually wrench the MANUAL OVERRIDE/POSITION INDICATOR [6] on the HIGH
STAGE VALVE [5] to the CLOSE position, Figure 903.
(b) Loosen the position indicator screw.
(c) Slide the lock into the recess in the cover plate.
(d) Apply loctite silver grade anti-seize compound, D50188 or Loctite C5-A compound,
D00667 or compound, D00010 to position indicator screw thread.
(e) Tighten the position indicator screw until mated with slot in the butterfly shaft.
G. Secure the Engine Access Panels
SUBTASK 30-00-00-860-020
(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 30-00-00-010-010
(2) Do this task: Close the Thrust Reverser (Selection), TASK 78-31-00-010-804-F00.
SUBTASK 30-00-00-010-009
(3) Do this task: Close the Fan Cowl Panels, TASK 71-11-02-410-801-F00.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-00-00
Page 913
D633A101-ILF Feb 15/2018
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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