invalid.
YA613 - YC413, YK101 - YK104

.  
blank when N1 SET outer knob is in AUTO position
YD651 - YD655

.  
when N1 SET outer knob is in AUTO position, may indicate fixed derate, assumed temperature derate, or a combination of fixed and assumed temperature derate

Not Displayed when Reverse Thrust is selected.

N1 RPM Indications
Displays N1% RPM:
.
displayed (white) – normal operating range

.
displayed (red) – operating limit exceeded.

N1 Maximum Bug
Displayed (amber) –
.
N1 value for maximum rated thrust

.
computed by the EEC through all phases of flight. Not Displayed when Reverse Thrust is selected.

Copyright . The Boeing Company. See title page for details.
7.11.6   September 29, 2005

Engines, APU -Over/Under – Displays
Thrust Reverser Indications

Thrust Reverser (REV) Indications
Displayed (amber) – thrust reverser is moved from stowed position.
Displayed (green) – thrust reverser is deployed.

Thermal Anti–Ice Indication

Thermal Anti–Ice (TAI) Indications
Displayed (green) – cowl anti–ice valve(s) open.
Displayed (amber) – cowl anti–ice valve is not in position indicated by related engine anti–ice switch.
EGT Indications

Copyright . The Boeing Company. See title page for details.
September 29, 2005  7.11.7
Engines, APU -Over/Under – Displays 737 Flight Crew Operations Manual

Exhaust Gas Temperature (EGT) Redlines
Displayed (red) – maximum takeoff EGT limit.

Exhaust Gas Temperature (EGT) Amber Bands
Displayed (amber) – lower end of band displays maximum continuous EGT limit.

Exhaust Gas Temperature (EGT) Start Limit Lines
Displayed (red) – until the engine achieves stabilized idle (approximately 59% N2).

Exhaust Gas Temperature (EGT) Readouts (digital)
Displayed (white) – normal operating range (degrees C)
YA613 - YC154, YK101 - YK104 Displayed (amber) – maximum continuous limit exceeded; color change inhibited for up to 5 minutes during takeoff or go-around
YC411 -YD655 Displayed (amber) – maximum continuous limit exceeded
.  
Color change inhibited for up to 5 minutes during takeoff or go-around
(normal operation)

.  
color change inhibited for up to 10 minutes during takeoff or go-around
(when an engine out condition occurs within the first 5 minutes of the
inhibit)

Displayed (red) – maximum takeoff limit or start limit exceeded
On ground, after both engines are shut down, red box indicates an exceedance has occurred
EEC senses conditions that may lead to hot start during ground starts (blinking white box).

Exhaust Gas Temperature (EGT) Indications
Displayed (white) – normal operating range.
YA613 - YC154, YK101 - YK104 Displayed (amber) – maximum continuous limit exceeded; color change inhibited for up to 5 minutes during takeoff or go–around
Copyright . The Boeing Company. See title page for details.
7.11.8   September 29, 2005

Engines, APU -Over/Under – Displays 737 Flight Crew Operations Manual
YC411 -YD655 Displayed (amber) – maximum continuous limit exceeded
.  
color change inhibited for up to 5 minutes during takeoff or go–around (normal operation)

.  
color change inhibited for up to 10 minutes during takeoff or go–around (when an engine out condition occurs within the first 5 minutes of the inhibit)

Displayed (red) – maximum takeoff limit or start limit exceeded.
Engine Fail Alert

Engine Fail (ENG FAIL) Alert
Displayed (amber) –
.
engine operating below sustainable idle (less than 50% N2); and

.
engine start lever in IDLE position. Alert remains until –

.
engine recovers; or

.
start lever moved to CUTOFF; or

.
engine fire warning switch pulled.

Crew Alerts

Copyright . The Boeing Company. See title page for details.
Engines, APU -Over/Under – Displays 737 Flight Crew Operations Manual

START VALVE OPEN Alert
Illuminated (amber) –
.
steady – respective engine start valve open and air is supplied to starter

.  
blinking – uncommanded opening of start valve. Alert is displayed and solid amber boxes are displayed in unannunciated positions for that engine. All three boxes blink for ten seconds, then alert remains on steady and solid amber boxes are removed (see Note).
　
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