YA613, YA626, YA721 - YA809, YC411 - YK104

Primary Engine Indications
Fuel Quantity Indications

Refer to Chapter 12, Fuel

Fuel Flow Indications YA613, YA626, YA721 - YA809, YC411 - YK104
Copyright . The Boeing Company. See title page for details.
7.11.2  June 1, 2005

Engines, APU -Over/Under – Displays
Total Air Temperature, Thrust Mode Display, Selected Temperature and Autothrottle Limit

Total Air Temperature (TAT) Indication
Displayed (label – cyan, temp – white) – total air temperature (degrees C).

Thrust Mode Display
Displayed (green) – the active N1 limit reference mode.
With N1 manual select knob on engine display control panel in AUTO, active N1 limit is displayed by reference N1 bugs.
Active N1 limit is normally calculated by FMC.
YA613 - YC413, YK101 - YK104 Thrust mode display annunciations are:
.
R-TO – reduced takeoff

.
R-CLB – reduced climb

.
TO – takeoff

.
CLB – climb

.
CRZ – cruise

.
G/A – go–around

.
CON – continuous
. – – – – FMC not computing thrust limit.

YA613 - YC413, YK101 - YK104
Note:  R-TO does not indicate the type of reduced takeoff. The N1 limit may be reduced due to the entry of an assumed temperature, a takeoff thrust derate or a combination of both assumed temperature and takeoff thrust derate.
Copyright . The Boeing Company. See title page for details.
Engines, APU -Over/Under – Displays 737 Flight Crew Operations Manual

YD651 - YD655
Thrust mode display annunciations are:

.
TO – takeoff

.
TO 1 – derated takeoff one

.
TO 2 – derated takeoff two

.
D-TO – assumed temperature reduced thrust takeoff

.
D-TO 1 – derate one and assumed temperature reduced thrust takeoff

.
D-TO 2 – derate two and assumed temperature reduced thrust takeoff

.
CLB – climb

.
CLB 1 – derated climb one

.
CLB 2 – derated climb two

.
CRZ – cruise

.
G/A – go–around

.
CON – continuous
. ––– – FMC not computing thrust limit.

Selected Temperature
Displayed (green) – selected assumed temperature (degrees C) for reduced thrust takeoff N1.
Repeats data selected on TAKEOFF REF page.

Autothrottle Limit (A/T LIM) Indication
Illuminated (white) – The FMC is not providing the A/T system with N1 limit values. The A/T is using a degraded N1 thrust limit from the related EEC.
Replaces thrust mode display annunciation when illuminated.
N1 Indications
YA613 - YC413, YK101 - YK104

Copyright . The Boeing Company. See title page for details.
7.11.4  June 1, 2005

Engines, APU -Over/Under – Displays
YD651 - YD655

N1 SET Outer Knob
AUTO –
.  
both reference N1 bugs set by FMC based on N1 limit page and takeoff
reference page

.
displays reference N1 bugs at active N1 limit for A/T. BOTH –

.  
both reference N1 bugs and readouts manually set by turning N1 SET
inner knob

.
has no effect on A/T operation. 1 or 2 –

.  
respective N1 reference bug and readout manually set by turning N1 SET
inner knob

.
has no effect on A/T operation.

N1 SET Inner Knob (spring-loaded to center)
Rotate – positions reference N1 bug(s) and readouts when N1 SET outer knob is set to BOTH, 1, or 2.

Reference N1 Bugs
Displayed (green) – with N1 SET outer knob in AUTO, 1, 2 or BOTH position.
Position corresponds to digital value on the Reference N1 Readout.

N1 Redlines
Displayed (red) – N1% RPM operating limit
Copyright . The Boeing Company. See title page for details.
Engines, APU -Over/Under – Displays 737 Flight Crew Operations Manual

N1 Command Sectors
Displayed (white) – momentary difference between actual N1 and value commanded by thrust lever position.

N1 RPM Readouts (digital)
Displayed (white) – normal operating range.
Displayed (red) –
. operating limit exceeded
. on ground after engine shutdown, red box indicates an inflight
exceedance has occurred.

Reference N1 Readouts
Displayed (green) –
.  
manually set N1% RPM when N1 SET outer knob is in BOTH, 1, or 2 position . – – – – when N1 SET outer knob is in AUTO position and FMC source
　
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