Engines, APU -Controls and Indicators 737 Operations Manual
Engine Oil Indications

Oil Pressure (OIL PRESS) Indicator
Displays engine oil pressure in psi.

Low Oil Pressure Yellow Band
With takeoff thrust set, indicates minimum oil pressure limit.

Oil Temperature (OIL TEMP) Indicator
Displays engine oil temperature in degrees C.

Oil Quantity (OIL QTY) Indicator
Displays engine oil quantity in gallons.
Engines, APU -Controls and Indicators 737 Operations Manual

Engine Vibration Indications

Indicates engine vibration level.
Engine Start Switches

ENGINE START Switches
GRD – . opens start valve
.  
closes engine bleed air valve (on 737–300 airplanes delivered after
November, 1988)

.  
provides ignition to selected igniter(s) when engine start lever is moved to
IDLE

.
releases to OFF at starter cutout.

OFF – ignition off
CONT – provides ignition to selected igniter(s) when engine start lever is in IDLE.
FLT –
.
provides ignition to both igniters when engine start lever is in IDLE

.
ignition select switch is bypassed when the Engine Start switch is in FLT.

Copyright . The Boeing Company. See title page for details.
7.10.20   December 5, 2003
Engines, APU -Controls and Indicators

Ignition Select Switch
IGN L – selects the left igniter for use on both engines.
BOTH – selects both igniters for use on both engines.
IGN R – selects the right igniter for use on both engines.

Engine Panel

REVERSER Light
Illuminated (amber) – one or more of following has occurred:
.  
isolation valve or thrust reverser control valve is not in commanded
position

.
thrust reverser sleeve position sensors are in disagreement

.
auto–restow circuit has been activated

Power Management Control (PMC) Switch
ON (ON in view – white) – PMC is selected ON.
INOP (INOP in view – amber) – PMC is inoperative when engine speed is above 46% N2, or the PMC is selected OFF.
Engines, APU -Controls and Indicators 737 Operations Manual

LOW IDLE Light
Illuminated (amber) –
.  
the thrust lever for either engine is near idle and the MEC on either engine is not commanded to maintain high idle RPM in flight

.
the speed of either engine is below 25% N1 in flight

.  
for airplanes that have the autothrottles connected to the FLT position of the engine start switch circuit, an engine start switch is in FLT and one or both engines are operating below 45% in flight above 500 feet radio altitude.

If an engine start lever is in CUTOFF, the light is deactivated.
Engine Controls

Forward Thrust Levers –
.
control engine thrust

.  
cannot be advanced if the related reverse thrust lever is in the deployed
position.

Reverse Thrust Levers –
.
control 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.
Copyright . The Boeing Company. See title page for details.
7.10.22   December 5, 2003

Engines, APU -Controls and Indicators 737 Operations Manual

Engine Start Levers
IDLE –
.
energizes ignition system

.  
electrically opens engine fuel shutoff valve in the wing leading edge outboard of the pylon

.
mechanically opens MEC shutoff valve.

CUTOFF –
.
closes both engine fuel shutoff valve and MEC shutoff valve

.
de-energizes ignition system.

Engines, APU -Controls and Indicators 737 Operations Manual

Intentionally
Blank

Copyright . The Boeing Company. See title page for details.
7.10.24  December 5, 2003

Engines, APU -Controls and Indicators 737 Operations Manual
APU

LOW OIL  LOW OIL  HIGH OIL  OVER 
QUANTITY  PRESSURE  TEMP  SPEED 

Copyright . The Boeing Company. See title page for details.
　
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