(d) Make sure that the PRSOV stays in the open position.
NOTE: The PRSOV is spring-loaded to the closed position. If there is pressure supplied
and the PRSOV does not stay open, there may be a leakage in the PRSOV or in
the sense line(s).
SUBTASK 30-11-41-860-008
(3) Make sure the engine and wing anti-ice panel commands the cowl anti-icing valves open:
(a) Put the ENG ANTI-ICE 1 switch in the ON position.
1) Make sure the left COWL VALVE OPEN light comes on brightly for 1 to 6 seconds.
2) Make sure the COWL VALVE OPEN light goes dimly after 6 seconds.
(b) Put the ENG ANTI-ICE 2 switch in the ON position.
1) Make sure the right COWL VALVE OPEN light comes on brightly for 1 to 6 seconds.
2) Make sure the COWL VALVE OPEN light goes dimly after 6 seconds.
SUBTASK 30-11-41-720-002
(4) Check the cowl thermal anti-ice (TAI) duct pressure switch inputs to the engine and wing
anti-ice panel:
(a) Open these circuit breakers and install safety tags:
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) Remove the electrical connector from the left cowl TAI duct pressure switch.
(c) Connect a jumper wire between pins 1 and 2 of the electrical connector.
1) Make sure the left COWL ANTI-ICE light comes on.
(d) Remove the jumper wire.
(e) Connect the electrical connector to the pressure switch.
1) Put the ENG ANTI-ICE 1 switch in the OFF position.
2) Make sure the left COWL ANTI-ICE light goes off.
(f) 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
(g) Open these circuit breakers and install safety tags:
CAPT Electrical System Panel, P18-3
Row Col Number Name
B 6 C00149 ANTI-ICE & RAIN ENGINE 2 CONTROL
B 7 C01002 ANTI-ICE & RAIN ENG 2 COWL AI VALVE
(h) Remove the electrical connector from the right cowl TAI duct pressure switch.
(i) Connect a jumper wire between pins 1 and 2 of the electrical connector.
1) Make sure the right COWL ANTI-ICE light comes on.
(j) Remove the jumper wire.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
30-11-41
Page 503
D633A101-ILF Oct 15/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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