S 865-004
(2)
See that these circuit breakers are closed:
(a)
ANTI-ICE & RAIN - ENGINE #1 AND WING
(b)
ANTI-ICE AND RAIN - WING VALVE
(c)
AIR/GND RELAY & LIGHTS
(d)
NOSE GEAR AIR/GND
S 865-003
(3) Momentarily push the L VALVE OPEN and the R VALVE OPEN lights on the P5-11 panel.
NOTE: Each light will come on, then go off.
____
S 865-002
(4)
See that the two thrust levers are in the IDLE position.
S 715-032
(5)
Make sure the throttle switches operate correctly on the ground.
(a)
Put the WING ANTI-ICE switch in the ON position.
(b)
Push the left thrust lever fully forward.
(c)
See that the L VALVE OPEN and the R VALVE OPEN lights come on continuously bright.
(d)
Pull the left thrust lever to the IDLE position.
(e)
See that the L VALVE OPEN and the R VALVE OPEN lights come on dimly after 1 to 3 seconds.
(f)
Push the right thrust lever fully forward.
(g)
See that the R VALVE OPEN and the L VALVE OPEN lights come on continuously bright.
(h)
Pull the right thrust lever to the IDLE position.
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(i) See that the L VALVE OPEN and the R VALVE OPEN lights come on dimly.
S 715-034
(6)
Make sure the throttle switches operate correctly in flight.
(a)
Open the Landing Gear - AIR/GND Relay and Lights circuit breaker on the P6 panel.
(b)
See that the ANTI-ICE switch moves to the OFF position automatically.
(c)
See that the L VALVE OPEN and R VALVE OPEN lights come on brightly for 1 to 3 seconds.
(d)
See that the L VALVE OPEN and R VALVE OPEN lights go off.
(e)
Push the left thrust lever fully forward.
(f)
Put the WING ANTI-ICE switch in the ON position.
(g)
See that the L VALVE OPEN and the R VALVE OPEN lights come on brightly for 1 to 3 seconds.
(h)
See that the L VALVE OPEN and the R VALVE OPEN are on dimly after 3 seconds.
(i)
Pull the left thrust lever to the IDLE position.
(j)
Put the WING ANTI-ICE switch in the OFF position.
(k)
See that the L VALVE OPEN and the R VALVE OPEN lights go off.
(l)
Push the right thrust lever fully forward.
(m)
Put the WING ANTI-ICE switch in the ON position.
(n)
See that the L VALVE OPEN and the R VALVE OPEN lights come on brightly for 1 to 3 seconds.
(o)
See that the L VALVE OPEN and the R VALVE OPEN lights are on dimly after 3 seconds.
(p)
Pull the right thrust lever to the IDLE position.
(q)
Put the WING ANTI-ICE switch in the OFF position.
(r)
See that the L VALVE OPEN and the R VALVE OPEN lights go off.
(s)
Close the Landing Gear - AIR/GND Relay and Lights circuit breaker.
(7)
Remove electrical power if it is not necessary (MM 24-22-00/201).
S 865-006
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737-300/400/500MAINTENANCE MANUAL
INLET COWL ANTI-ICING SYSTEM - DESCRIPTION AND OPERATION
________________________________________________________
1. General (Fig. 1)_______
A. The inlet cowl anti-icing system is a thermal system using engine hot bleed air from the 5th and 9th-stages of the high pressure compressor (HPC) section. The function of the system is to maintain ice free inlet cowl surfaces during flight and ground operations.
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