Boeing 737 - 600/700/800/900. Operations Manual (1997 year)

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

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.

N1 Redlines

Displayed (red) - N1% RPM operating limit

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:

• set with N1 SET inner knob when N1 SET is in BOTH, 1, or 2 position

• blank when N1 SET outer knob in AUTO position

•

- - - - when N1 SET outer knob in Auto and FMC source invalid.

N1 RPM Indications

Displays N1% RPM:

• displayed (white) - normal operating range

• displayed (red) - operating limit exceeded.

7.11.4

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Thrust Reverser Indications

REV

75.3

UPPER DISPLAY UNIT

Thrust Reverser (REV) Indications

Displayed (amber) - thrust reverser is moved from stowed position.

Displayed (green) - thrust reverser is deployed.

Thermal Anti-Ice Indication

TAI

87.7

UPPER DISPLAY UNIT

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

663

EGT

UPPER DISPLAY UNIT

7.11.5

Engines, APU -

Over/Under - Displays

Boeing 737 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) - N2 less than 50%.

Exhaust Gas Temperature (EGT) Readouts (digital)

Displayed (white) - normal operating range (degrees C)

[Option - Color change inhibit 5 minutes]

Displayed (amber) - maximum continuous limit exceeded; color change inhibited

for up to 5 minutes during takeoff or go-around

[Option - Color change inhibit 10 minutes]

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 engine shutdown, 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.

[Option - Color change inhibit 5 minutes]

Displayed (amber) - maximum continuous limit exceeded; color change inhibited

for up to 5 minutes during takeoff or go-around

[Option - Color change inhibit 10 minutes]

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)

7.11.6

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Displayed (red) - maximum takeoff limit or start limit exceeded.

Engine Fail Alert

467

663

ENG

FAIL

EGT

UPPER DISPLAY UNIT

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

ENG 1

ENG 2

START VALVE

OPEN

OIL FILTER

BYPASS

LOW OIL

PRESSURE

UPPER DISPLAY UNIT

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).

7.11.7

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

LOW OIL PRESSURE Alert

Illuminated (amber) -

• steady - oil pressure at or below red line

• blinking - with a condition of low oil pressure. 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).

OIL FILTER BYPASS Alert

Illuminated (amber) -

• steady - indicates an impending bypass of scavenge oil filter

• blinking - with an impending bypass. 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).

Note: Blinking is inhibited:

• during takeoff from 80 knots to 400 feet RA, or 30 seconds after reaching

80 knots, whichever occurs first

• during landing below 200 feet RA until 30 seconds after touchdown

• during periods when blinking is inhibited, alerts illuminate steady.

7.11.8

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Secondary Engine Indications

[Option - Over/Under display, kgs]

81.1

3.90

120

1.6

4.5

LOWER DISPLAY UNIT

Secondary Engine Indications

Secondary engine indications are displayed:

• when CDS initially receives power

• when selected by the Multi-Function Display (MFD)

• in flight when an engine start lever moved to CUTOFF

• in flight when an engine fails

• when a secondary engine parameter exceeds normal operating range.

7.11.9

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

N2 Indications

81.1

LOWER DISPLAY UNIT

N2 Redlines

Displayed (red) - N2% RPM operating limit.

N2 RPM Indications

Displays N2% RPM

• displayed (white) - normal operating range

• displayed (red) - operating limit exceeded.

N2 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.

Crossbleed Start Indication

X-BLD

12.7

87.6

LOWER DISPLAY UNIT

Crossbleed Start (X-BLD) Indication

Displayed (magenta) - crossbleed air recommended for inflight start.

7.11.10

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Displayed when airspeed is less than required for a windmilling start.

Fuel Flow/Fuel Used Indications

[Option - Over/Under display, kgs]

3.90

FUEL FLOW

RESET

RATE

USED

5.36

CENTER

FORWARD PANEL

LOWER DISPLAY UNIT

FUEL FLOW Switch (spring-loaded to RATE)

RATE - displays fuel flow to engine.

USED -

• displays fuel used since last reset

• after 10 seconds, display automatically reverts to fuel flow.

RESET -

• resets fuel used to zero

• displays fuel used for 1 second, decreases to zero, then displays fuel flow.

Fuel Flow (FF) Readout (digital)

[Option - kgs]

Displayed (white) - fuel flow to engine with FUEL FLOW switch in RATE

position (kilograms per hour x 1000).

Fuel Used Readout (digital)

Illuminated (white) - displayed when FUEL FLOW switch moved to USED or

RESET.

7.11.11

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Oil Pressure Indications

OIL

PRESS

LOWER DISPLAY UNIT

Oil Pressure (OIL PRESS) Readout

Displays engine oil pressure (psi)

• displayed (white) - normal operating range

• displayed (amber) - caution range

• displayed (red) - operating limit reached.

Oil Pressure (OIL PRESS) Pointer

Displays engine oil pressure:

• displayed (white) - normal operating range

• displayed (amber) - caution range reached

• displayed (red) - operating limit reached.

Low Oil Pressure (OIL PRESS) Amber Band

Displayed (amber) - low oil pressure caution range beginning at red line.:

• variable depending on N2% RPM above 65% N2

• amber band not displayed below 65% N2.

Low Oil Pressure (OIL PRESS) Redline

Displayed (red) - oil pressure operating limit.

7.11.12

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Oil Temperature Indications

OIL

125

120

TEMP

LOWER DISPLAY UNIT

Oil Temperature (OIL TEMP) Readout

Displays oil temperature (degrees C):

• displayed (white) - normal operating range

• displayed (amber) - caution range reached

• displayed (red) - operating limit reached.

Oil Temperature (OIL TEMP) Pointer

Displays oil temperature (degrees C):

• displayed (white) - normal operating range

• displayed (amber) - caution range reached

• displayed (red) - operating limit reached.

High Oil Temperature (OIL TEMP) Amber Band

Displayed (amber) - oil temperature caution range.

High Oil Temperature (OIL TEMP) Redline

Displayed (red) - oil temperature operating limit.

Oil Quantity Indications

OIL QTY

LOWER DISPLAY UNIT

7.11.13

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Oil Quantity (OIL QTY) Readout

[Option - liters]

Displays usable oil quantity in liters.

Video is reversed and LO (white) displayed for low oil quantity.

Note: Indicated oil quantity may decrease significantly during engine start,

takeoff and climb out. If this occurs, engine operation is not impacted and

the correct oil quantity should be indicated during level flight.

Note: An oil quantity indication as low as zero is normal if windmilling N2 RPM

is below approximately 8%.

Engine Vibration Indications

1.2

VIB

4.5

LOWER DISPLAY UNIT

Vibration (VIB) Readout

Displayed (white) - engine vibration level.

Video is reversed for high vibration.

High Limit

Displays tick mark and thick line.

Vibration (VIB) Pointer

Displayed (white) - engine vibration level.

7.11.14

Engines, APU -

Over/Under - Displays

Boeing 737 Operations Manual

Compact Engine Displays

The following changes occur to the secondary engine display in the compact

engine displays.

[Option - kgs]

TAT

-12c R-TO

+42c

ENG 1

ENG 2

START VALVE

OPEN

96.0

TAI

OIL FILTER

87.7

12.7

BYPASS

LOW OIL

PRESSURE

663

113

EGT

81.6

10.6

3.80

0.00

OIL PRESS

120

OIL TEMP

105

OIL QTY

CTR

1.2

VIB

4.5

7600

FUEL

3800

UPPER OR LOWER DISPLAY UNIT

N2 RPM Indications

N2 changes from round dial display to a digital display.

The digital display is framed by a red box after engine shutdown on the ground if

an inflight exceedance occurred.

OIL PRESS, OIL TEMP Indications

Displayed as digital readouts only

The digital readouts display amber or red if limits are exceeded.

7.11.15

Boeing 737 Operations Manual

Engines, APU

Chapter 7

General Controls and Indicators

Section 15

Engine Start Switches

[Option - Without automatic ignition]

ENGINE START

GRDOFF CONT

BOTH

FLT

IGN

FORWARD OVERHEAD PANEL

[Option - With automatic ignition]

ENGINE START

GRDAUTOCONT

BOTH

FLT

IGN

FORWARD OVERHEAD PANEL

ENGINE START Switches

GRD -

• opens start valve

• closes engine bleed valve

• for ground starts, arms selected igniter(s) to provide ignition when engine

start lever is moved to IDLE

• for inflight starts, arms both igniters to provide ignition when engine start

lever is moved to IDLE

[Option - Without automatic ignition]

• releases to OFF at start valve cutout.

7.15.1

Engines, APU -

General Controls and Indicators

Boeing 737 Operations Manual

[Option - With automatic ignition]

• releases to AUTO at start valve cutout.

[Option - Without automatic ignition]

OFF -

• ignition normally off

• both igniters are activated when engine start lever is in IDLE and:

• an uncommanded rapid decrease in N2 occurs or,

• N2 is between 57% and 50% or,

• in flight - N2 is between idle and 5%.

[Option - With automatic ignition]

AUTO -

• ignition normally off

• both igniters are activated when engine start lever is in IDLE and:

• an uncommanded rapid decrease in N2 occurs or,

• N2 is between 57% and 50% or,

• in flight - N2 is between idle and 5%.

• provides automatic ignition to selected igniters when:

• engine is running and,

• flaps are not up below 18000 feet altitude or,

• engine anti-ice is selected to ON.

CONT -

• provides ignition to selected igniters when engine is operating and engine

start lever is in IDLE

• in flight - provides ignition to both igniters when N2 is below idle and

engine start lever is in IDLE.

FLT - provides ignition to both igniters when engine start lever is in IDLE.

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.

7.15.2

Engines, APU -

General Controls and Indicators

Boeing 737 Operations Manual

Engine Display Control Panel

[Option - Side by side display]

N1 SET

SPD REF

AUTO

BOTH

SET

VREF

FUEL FLOW

MFD

RESET

INOP

RATE

USED

CENTER FORWARD PANEL

[Option - Over/Under display]

N1 SET

SPD REF

AUTO

BOTH

SET

VREF

FUEL FLOW

MFD

RESET

ENG SYS

RATE

USED

CENTER FORWARD PANEL

N1 SET Knob

[Option - Side by side display]

Refer to section 10, Side by Side - Displays

[Option - Over/Under display]

Refer to section 11, Over/Under - Displays

7.15.3

Engines, APU -

General Controls and Indicators

Boeing 737 Operations Manual

FUEL FLOW Switch

[Option - Side by side display]

Refer to section 10, Side by Side - Displays

[Option - Over/Under display]

Refer to section 11, Over/Under - Displays

Speed Reference Selector

Refer to Chapter 10, Flight Instruments, Displays.

MFD Engine (ENG) Switch

[Option - Over/Under display]

Push - ENG

• displays secondary engine indications on lower DU; or if the lower DU is

unavailable, on upper or inboard DU based on the position of the display

select panel selector

• second push blanks lower DU.

MFD System (SYS) Switch

[Option - Over/Under display, flight control surface position indicator, brake

temperature monitor indicator]

Refer to Chapter 13, Hydraulics; Chapter 9, Flight Controls; Chapter 14, Landing

Gear.

Engine Panel

ENGINE

REVERSER

EEC

ENGINE

CONTROL

ALTN

AFT OVERHEAD PANEL

7.15.4

Engines, APU -

General Controls and Indicators

Boeing 737 Operations Manual

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.

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.

7.15.5

Engines, APU -

General Controls and Indicators

Boeing 737 Operations Manual

Engine Controls

IDLE

CUTOFF

CONTROL STAND

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.

7.15.6

Engines, APU -

General Controls and Indicators

Boeing 737 Operations Manual

APU

LOW OIL

OVER

MAINT

FAULT

PRESSURE

SPEED

EGT

APU

OFF

START

FORWARD OVERHEAD PANEL

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

7.15.7

Boeing 737 - 600/700/800/900. Operations Manual (1997 year) - page 36