Engines, APU -General Controls and Indicators 737 Flight Crew Operations Manual
MFD System (SYS) Switch YA686 - YA722, YC153, YC154
Refer to Chapter 13, Hydraulics.
MFD System (SYS) Switch YC411, YC413
Refer to Chapter 13, Hydraulics; Chapter 9, Flight Controls; Chapter 14, Landing Gear.
MFD System (SYS) Switch YA613, YA626, YA801 - YA809, YD651 - YK104
Refer to Chapter 13, Hydraulics; Chapter 9, Flight Controls.
Engine Panel
REVERSER Lights
Illuminated (amber) – one or more of following has occurred:
.
isolation valve or thrust reverser control valve is not in commanded
position
. one or more thrust reverser sleeves are not in commanded state
.
auto–restow circuit has been activated
.
a failure has been detected in synchronization shaft lock circuitry.
ENGINE CONTROL Lights
Illuminated (amber) – engine control system is not dispatchable due to faults in system.
Copyright . The Boeing Company. See title page for details.
Engines, APU -General Controls and Indicators
Light operates when:
.
engine is operating and,
.
airplane on ground and:
.
below 80 kt prior to takeoff or,
.
approximately 30 seconds after touchdown.
Electronic Engine Control (EEC) Switches
ON – in view (white)
.
indicates normal control mode is selected
.
engine ratings calculated by EEC from sensed atmospheric conditions and
bleed air demand
.
when ON is not in view, the EEC has been manually selected to the
alternate mode.
ALTN – in view (amber)
.
indicated EEC has automatically switched to alternate control mode or it
has been selected manually
.
EEC provides rated thrust or higher.
Note: Both ON and ALTN may be in view if EEC has automatically switched to soft alternate mode.
Note: EGT limits must be observed in both normal and alternate control modes.
Engine Controls
Copyright . The Boeing Company. See title page for details.
7.15.4 June 1, 2005
Engines, APU -General Controls and Indicators 737 Flight Crew Operations Manual
Forward Thrust Levers –
.
controls engine thrust
.
cannot be advanced if the reverse thrust lever is in the deployed position.
Reverse Thrust Levers –
.
controls engine reverse thrust
.
cannot select reverse thrust unless related forward thrust lever is at IDLE.
Note: Reverse thrust lever is blocked at reverse idle position until related thrust reverser is more than 60% deployed.
Note: Movement of reverse thrust lever into reverse thrust engages locking pawl preventing forward thrust lever from moving. Terminating reverse thrust removes locking pawl and restores forward thrust lever movement ability.
Engine Start Levers
IDLE –
.
energizes ignition system through EEC
.
electrically opens spar fuel shutoff valve in the wing leading edge
outboard of the pylon
.
electrically opens engine–mounted fuel shutoff valve via the EEC. CUTOFF –
.
closes both spar and engine fuel shutoff valves
.
de–energizes ignition system.
Copyright . The Boeing Company. See title page for details.
Engines, APU -General Controls and Indicators 737 Flight Crew Operations Manual
APU
APU Maintenance (MAINT) Light
Illuminated (blue) – APU maintenance problem exists:
.
APU may be operated
.
light is disarmed when APU switch is in OFF.
APU Exhaust Gas Temperature (EGT) Indicator
Displays APU EGT
EGT indicator remains powered for 5 minutes after shutdown.
APU OVERSPEED Light
Illuminated (amber) –
. APU RPM limit has been exceeded resulting in an automatic shutdown
. overspeed shutdown protection feature has failed a self–test during a
normal APU shutdown
Copyright . The Boeing Company. See title page for details.
7.15.6 July 28, 2000
Engines, APU -General Controls and Indicators 737 Flight Crew Operations Manual
.
if light is illuminated when APU switch is placed to OFF, light
extinguishes after 5 minutes
.
light is disarmed when the APU switch is in OFF position.
APU FAULT Light
Illuminated (amber) –
.
a malfunction exists causing APU to initiate an automatic shutdown
.
if light is illuminated when APU switch is placed to OFF, light
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