Boeing 737-800 - Page 1585

737 Flight Crew Operations Manual
Landing Gear -
System Description
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D6-27370-866-EGP 14.20.7
SYSTEMS
NORMAL INFLIGHT
OPERATION
NORMAL ON GROUND
OPERATION
REFER
TO CH
Pack Valves With one pack
operating, regulates to
high flow with flaps up.
With one pack operating,
regulates to high flow only
when pack is operating
from the APU and both
engine bleed switches are
OFF.
2
Pressurization Allows programmed
pressurization in the
automatic modes.
Allows pressurization
only at high power
settings.
2
Ram Air Ram Air fans operate
whenever air
conditioning packs
operate.
Ram Air fans operate
whenever air conditioning
packs operate. Deflectors
are extended.
2
Wing Anti–
ice
Control valves open
when switch is ON.
Thrust setting and duct
temperature logic is
bypassed.
With switch ON, valves
cycle open and closed.
Switch trips to OFF at lift–
off.
3
Autothrottle Enables go–around
below 2000 ft radio
altitude.
Disengaged 2 seconds
after landing. Takeoff
mode enabled.
4
TO/GA
switch
Flight director engages
go–around mode.
Flight director engages
takeoff mode.
4
ACARS Sends out signal on strut
extension for takeoff
signal.
Sends out signal on strut
compression for landing
signal.
5
Voice
Recorder
Prevents tape erasure. Allows tape erasure when
parking brake is set.
5
Engine Idle
Control
Enables minimum flight
idle.
Enables minimum ground
idle.
7
Thrust
Reverser
Thrust reverse disabled. Thrust reverse enabled. 7
APU Fire
Horn
Wheel well horn
disabled.
Wheel well horn enabled. 8
September 26, 2013