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Boeing 737 - 600/700/800/900. Operations Manual (1997 year) - page 54

Flight Instruments, Displays -

PFD/ND Navigation Displays

Boeing 737 Operations Manual

SYMBOL

NAME

ND MODE

REMARKS

TCAS off scale

MAP,

Displayed whenever RA or

OFFSCALE

message (RA-R,

MAP CTR,

TA traffic is outside the

TA-A)

APP,

traffic area covered by the

VOR

ND range. Displayed only

if the EFIS control panel

TFC switch is selected on.

TCAS mode (C)

MAP,

Indicates the ND TCAS

TFC

MAP CTR,

display is active; the EFIS

APP,

control panel TFC switch is

VOR

selected on.

TCAS mode (C)

All

Indicates TCAS computer

TA ONLY

is not computing RAs.

Displayed whether the

EFIS control panel TFC

switch is selected on or off.

TCAS mode (C)

All

Indicates TCAS is

TCAS TEST

operating in the test mode.

Displayed whether EFIS

control panel TFC switch is

selected on or off.

TCAS mode (A)

All

Displayed when the

TCAS

TCAS/ATC mode switch is

OFF

not in TA ONLY or TA/RA,

whether EFIS control panel

TFC switch is selected on

or off. Not displayed if

TCAS is failed.

TCAS mode (A)

All

Indicates TCAS failure,

TCAS

whether EFIS control panel

FAIL

TFC switch is selected on

or off. Once displayed, can

be cycled on/off with the

TFC switch.

10.41.18

Boeing 737 Operations Manual

Flight Instruments, Displays

Chapter 10

Head-Up Display System, Symbology

Section 42

Introduction

HUD symbology consists of green symbols projected on the combiner from the

OHU. The PRI mode display symbols are similar to those on the CDS, and can be

used for all phases of flight. The approach mode displays (AIII, IMC, VMC) are

optimized to enhance aircraft control and situational awareness during final

approach, flare, and touchdown.

In addition to flight symbology, TCAS resolution advisories and HUD system

failure flags and data source annunciations are displayed when active.

Head-Up Guidance Display Symbology

[Option - Model 2350]

The following symbols can be displayed on the combiner, depending on HUD and

EFIS control panel switch selections.

SYMBOL

NAME

MODE

REMARKS

Airplane reference

All

Top center point of the

symbol represents

airplane projected

centerline. The symbol is

positioned at a fixed

position 7 ° above the

display’s vertical center.

Symbol is fixed at

display center when the

unusual attitude display

is active.

Horizon Line

All

Indicates the horizon

relative to the airplane

reference symbol.

Position based on current

airplane pitch and roll

attitude.

Pitch Scale

PRI in flight,

Displays airplane pitch in

5

5

AIII approach,

five degree increments

IMC, VMC

between -20 ° and +25 °.

-5

-5

October 15, 2001

10.42.1

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Compressed pitch

PRI in flight,

Displays airplane pitch in

-10

-10

scale

AIII approach,

ten degree increments

-20

-20

IMC, VMC

between +/-30 ° and

-30

-30

+/-90 °.

-40

-40

A chevron appears on the

pitch scale at -20 ° and

+30 °.

Bank Scale and

All

Displays the

Pointer

corresponding roll

attitude in ten degree

increments between 0 °

and +/-30 °. Tic marks at

+/-45 ° and +/-60 ° are

added when the airplane

exceeds +/-35 ° and

+/-50 ° respectively.

Horizon heading scale

All

Magnetic heading is

29

30

31

displayed in five degree

increments (and labeled

every 10 °) on the

horizon line.

A downward pointing

triangle indicates current

airplane magnetic

heading.

HSI heading scale

PRI in flight

Displays airplane

magnetic heading in a

210 ° compass rose

format.

Heading pointer

PRI in flight

Indicates current heading.

Drift angle pointer

PRI in flight

Indicates current drift

angle or track.

10.42.2

October 15, 2001

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

31

32

Selected heading bug

All

Displays selected

heading on the horizon

line and on the HSI

(when in view).

Not displayed if the

selected heading is

outside of the currently

displayed heading scale.

Digital selected

All

Displayed full time in

heading

PRI mode and for five

HDG 315

seconds after selection in

the IMC, VMC or AIII

modes.

Digital heading

All

Displays current

H 310

magnetic heading

directly below the roll

scale pointer.

Ground roll reference

PRI ground

Provides a reference for

ground roll guidance

during low visibility

takeoff operations.

Flight path vector

PRI in flight,

Displays the actual flight

AIII approach,

path vector of the aircraft.

IMC, VMC

Has display priority over

all other symbols except

the guidance cue and the

FLARE command.

Flight path

All

Positioned left of the

acceleration

flight path vector;

indicates sum of all

forces affecting the

airplane including thrust,

drag, and wind.

Positioned above flight

path vector; airplane is

accelerating. Positioned

below flight path vector;

airplane is decelerating.

10.42.3

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Pitch limit indication

PRI in flight,

Displayed whenever the

(also called angle of

AIII approach,

airplane’s angle of attack

attack limit)

IMC, VMC

is within 5 ° of stick

shaker, any time stick

shaker is active, or

whenever WINDSHEAR

guidance cue is

displayed.

Slip/skid indicator

All

The bottom portion of the

bank scale pointer moves

laterally with respect to

the top triangle portion of

the pointer.

Additional slip/skid

PRI in flight,

Positioned below the

indicators

AIII approach,

airplane reference and

IMC, VMC

flight path symbols.

Displayed during takeoff

until 1500 feel AGL.

Displayed (bold) on

approach, if TO/GA is

engaged below 1000 feet

AGL, and remain until

1500 feet AGL, or when

TO/GA mode is exited.

Speed error tape

PRI in flight,

Displays the difference

AIII approach,

between indicated

IMC, VMC

airspeed and the

reference speed selected

on the mode control

panel.

Tape length equal to the

diameter of the flight

path circle represents

approximately 5 knots of

error. Maximum tape

length is limited to 15

knots of error.

10.42.4

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Bank warning

PRI in flight,

Displayed if radio

AIII approach,

altitude is less than 100

IMC, VMC

feet and airplane roll

angle exceeds 5 °.

Symbol remains until roll

angle is less than 3 ° or

radio altitude greater than

100 feet.

Flight director

PRI in flight,

Functions similar to the

guidance cue

IMC

flight director, but is

designed for control of

flight path.

Automatically displayed

when pitch is less than 2°

or radio altimeter

indicates 50 feet.

The objective is to

capture the guidance cue

inside the flight path

vector circle.

HUD guidance cue

PRI ground,

Similar to flight director

AIII approach

guidance cue, but driven

by HUD computer.

During low visibility

takeoff, the cue provides

localizer tracking.

During AIII approach,

the cue provides

approach and flare

commands.

The objective is to

capture the guidance cue

inside the flight path

vector or ground roll

reference circle.

10.42.5

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

TO/GA pitch target

PRI in flight,

Displayed when greater

line

PRI ground

than 65 knots, AFDS

TO/GA mode active and

a valid pitch command

input of greater than 10 °

is received. Symbol

remains until TO/GA

mode is exited.

The objective is to place

the airplane reference

symbol on the target line.

AIII flare command

AIII approach

Initially displayed 2-3 °

directly below the

guidance cue at 105 feet

above runway elevation.

The symbol flashes for

one second and rises

toward the guidance cue

at a rate proportional to

the expected flare pitch

rate.

At an altitude between 45

and 55 feet, the flare

command and guidance

cue meet and continue

rising to command the

flare maneuver until

touchdown.

Flare cues

PRI in flight,

Displayed on each side of

IMC, VMC

the flight path symbol,

indicating the flare

maneuver must be

accomplished. The cues

flash continuously as the

airplane descends

through 55 feet radio

altitude, until 10 feet

radio altitude is reached.

10.42.6

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Wind direction/speed

PRI in flight,

Indicates wind speed and

and wind arrow

AIII approach,

direction, with respect to

IMC,VMC

airplane magnetic

28

heading. Displayed if

wind magnitude is

greater than 6 knots and

blanked if wind

magnitude becomes less

than 4 knots.

Windshear warning

PRI in flight,

Displayed above the

WINDSHEAR

AIII approach,

airplane reference

IMC,VMC

symbol during a GPWS

or PWS windshear

warning.

Ground proximity

PRI in flight,

Displayed whenever the

PULL UP

warning

AIII approach,

GPWS is activated.

IMC,VMC

Windshear guidance

PRI in flight

During a windshear

cue

warning, and in TO/GA

mode, the PRI mode is

automatically selected

and the guidance cue

becomes a solid circle to

provide guidance to exit

windshear conditions.

10.42.7

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Radio altitude

PRI in flight,

Displayed below the

AIII approach,

flight path symbol, or

250

IMC,VMC

relative to the airplane

reference symbol if the

flight path symbol is not

displayed.

The value is removed

from the display at 1500

feet when ascending and

again displayed at 1400

feet when descending.

This value is displayed in

ten foot increments

between 50 and 1500

feet, five foot increments

between 10 and 50 feet

and one foot increments

between -20 and 10 feet.

Decision height

PRI in flight,

Displayed left of radio

AIII approach,

altitude when selected

DH

IMC

decision height is

reached.

When decision height is

reached, the message

flashes for 3 seconds and

then remains steady.

Marker beacon

PRI in flight,

Displayed below the

OM

or

AIII approach,

airplane reference

MM

IMC

symbol for marker

or

IM

beacon passage.

Digital airspeed

AIII approach,

Displays airspeed next to

AIII rollout,

the flight path symbol if

210

IMC, VMC

it is displayed, and next

to the airplane reference

symbol if flight path is

not displayed.

Digital selected

All

Displays speed selected

AS

airspeed

on the MCP.

210

10.42.8

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Digital ground speed

All

Displays digital ground

GS

speed.

120

Digital mach

PRI in flight

Displays mach speed

below airspeed scale

.540

when mach speed is

above .400. Removed

when below .380.

Selected mach

All

Displays selected mach

speed above airspeed

.39

scale (PFD/ND format

only).

Digital barometric

AIII approach,

Displays barometric

altitude

AIII rollout,

altitude relative to the

450 B

IMC, VMC

flight path symbol if it is

displayed, and relative to

the airplane reference

symbol if flight path is

not displayed.

Digital vertical speed

PRI in flight,

In PRI mode, displayed

AIII approach,

in the lower right corner

600 VS

IMC, VMC

of the display. In all other

modes, displayed to the

right of the flight path

symbol.

Value displayed in 50

feet/minute increments.

DME distance

PRI in flight,

Indicates DME distance

AIII approach,

to the reference navaid.

DME28.4

IMC, VMC

Distance to go

PRI in flight,

Distance to next

IMC

waypoint.

58.4NM

Selected course

All

Displayed full time in

(digital)

PRI mode and for five

CRS 316

seconds after selection in

the IMC, VMC or AIII

modes.

10.42.9

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

31

32

Selected course

All

Displays MCP selected

pointer

course below the horizon

line and on the HSI (PRI

mode only).

The horizon line pointer

is surrounded by a 3 ° gap

in the horizon line.

System source

PRI in flight,

Indicates the selected

VOR 1,2

annunciation

PRI ground,

receiver as the display

ILS 1,2

AIII approach,

source.

AIII rollout

IMC

Indicates source cannot

VOR/ILS

be determined.

FMC source

All

Indicates the selected

FMC L, R

annunciation

FMC as the system

source.

Glideslope reference

AIII approach,

Displays the glideslope

-3.00

-3.00

line

IMC, VMC

value entered on the

HUD control panel.

Positioning the flight

path symbol over the

glideslope reference line

results in a descent angle

equal to the value

entered.

ILS localizer or VOR

PRI in flight

Displays LOC or VOR

deviation indication

course deviation on the

and scale

HSI.

With excessive localizer

deviation during an ILS

approach, the symbol will

flash until the excessive

deviation is no longer

present.

10.42.10

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Glideslope pointer and

PRI in flight

Displays glideslope

deviation scale

position and deviation

during ILS approach.

With excessive

glideslope deviation, the

pointer will flash until the

excessive deviation is no

longer present.

Vertical deviation

PRI in flight,

Full scale represents 400

pointer and scale

IMC

feet of vertical deviation.

When the deviation is off

scale, the pointer is

parked at the top or

460

bottom of the tape, and

the digital value is

displayed at the

appropriate end of the

scale.

Lateral deviation line

AIII approach,

Displayed as vertical

IMC

lines referenced to the

selected course.

In IMC mode, the line

will flash during

excessive localizer

deviation.

Glideslope deviation

AIII approach,

Displayed as horizontal

line

IMC

lines referenced to the

-3.00

-3.00

glideslope reference line.

In IMC mode, the line

will flash during

excessive glideslope

deviation.

The line is removed

below 70 feet radio

altitude.

29

30

31

Ground localizer line

PRI ground,

Displays localizer

AIII rollout,

deviation as a vertical

IMC

line below the airplane

reference symbol and is

referenced to the selected

course.

October 15, 2001

10.42.11

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

VOR1/ADF 1 pointer

PRI in flight

Indicates bearing to

head and tail

(head) or from (tail) the

tuned station.

VOR2/ADF 2 pointer

head and tail

To/from pointer

PRI in flight,

A triangle pointing in the

PRI ground

same direction as the

selected course indicates

a “to” condition. Pointing

away from the selected

course indicates a “from”

condition.

TO/FROM

AIII approach,

Displayed below the

VOR1

annunciation

IMC

VOR system source

FROM

annunciation. Indicates

movement to or from a

VOR station.

Runway elevation

AIII approach

Indicates entered runway

elevation for 5 seconds

ELV 426

after AIII mode is

selected or if elevation

value is changed during

AIII mode operation.

Runway edge lines

AIII approach

Displayed between 300

and 60 feet radio altitude.

The lines are scaled to a

width of 200 feet and a

length of 8000 feet.

Tic marks are displayed

at the touchdown

aimpoint representing

1050 feet from the

runway threshold.

10.42.12

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

IDLE message

AIII approach

Displayed below the

radio altitude when flare

IDLE

guidance commands a

thrust reduction to idle

for touchdown.

Message is displayed

between 25 and 5 feet

radio altitude, continuing

until touchdown.

ALIGN HUD message

IMC, VMC

Indicates the combiner is

not properly aligned with

ALIGN HUD

the OHU.

HUD system mode

AIII approach,

Indicates current HUD

IMC

or

AIII rollout,

system mode.

VMC

IMC, VMC

or

The PRI mode is not

AIII

indicated as it is uniquely

identifiable by the

airspeed and altitude

tapes.

AIII approach status

PRI in flight

A flashing “AIII”

indicates availability of

A

III

AIII approach mode.

AIII approach

Indicates AIII mode

AIII

selection once all AIII

or

approach requirements

NO AIII

have been satisfied.

If AIII capability is lost,

the “NO AIII” status

message is displayed.

Approach warning

AIII approach

Displayed below 500 feet

if approach monitoring

APCH WARN

tolerances are exceeded

or AIII capability is lost.

10.42.13

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

TCAS Resolution Advisory

SYMBOL

NAME

MODE

REMARKS

Down preventive

PRI in flight,

Area(s) inside the lines

AIII approach,

indicate the pitch

IMC, VMC

region(s) to avoid in

order to resolve the traffic

conflict. The flight path

Up preventive

symbol should be

positioned outside the

pitch command area(s) to

ensure traffic avoidance.

Up and down

A double-lined box

preventive

indicates a corrective

action is required, and

represents TCAS

maneuver guidance to

Descend corrective

maintain or increase

separation from the

traffic.

Climb corrective

Combined corrective

10.42.14

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

Failure Flags and Data Source Annunciations

SYMBOL

NAME

MODE

REMARKS

IRS attitude flag

All

IRS pitch or roll attitude

has failed.

ATT

Pitch miscompare flag

All

Indicates a pitch

miscompare of greater

PITCH

than 5 ° for more than 1.5

seconds.

Roll miscompare flag

All

Indicates a roll

miscompare of greater

ROLL

than 5 ° for more than 1.5

seconds.

Heading flag

All

Heading data has failed.

HDG

No heading

All

IRU heading has no

computed data.

H ---

Airspeed flag

All

Airspeed information has

S

failed. In PRI mode, if

P

airspeed has no computed

D

data, airspeed data is

removed and no failure

flag is displayed.

The boxed characters are

positioned vertically in

the PRI mode or

horizontally in the AIII,

IMC or VMC modes.

10.42.15

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Altitude flag

All

Altitude information has

A

failed. In PRI mode, if

L

T

altitude has no computed

data, altitude data is

removed and no failure

flag is displayed.

The boxed characters are

positioned vertically in

the PRI mode or

horizontally in the AIII,

IMC or VMC modes.

Decision speed flag

PRI ground

V1 decision speed or VR

rotation speed has not

NO

VSPD

been entered or is invalid.

Speed limit flag

PRI in flight,

Maximum operating

PRI ground

speed data has failed.

SPD

LIM

Mach flag

PRI in flight,

MACH airspeed has

PRI ground

failed.

MACH

Vertical speed flag

All

Vertical speed has failed.

In PRI mode, a vertical

VS

speed failure may be

indicated by a dashed line

to the left of the flag.

Vertical speed

PRI in flight,

Vertical speed has no

AIII approach,

computed data.

--- VS

IMC, VMC

Selected altitude flag

PRI in flight,

Selected altitude has

PRI ground

failed.

SEL ALT

Selected airspeed flag

All

Selected speed has failed.

SEL SPD

10.42.16

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Radio altitude flag

All

Radio altitude has failed.

RA

Localizer miscompare

PRI in flight

Localizer miscompare

flag

PRI ground

has occurred during low

LOC CMP

visibility takeoff.

Vertical deviation flag

PRI in flight,

FMC vertical track data

V

IMC

is invalid.

T

K

Vertical deviation pointer

is removed if there is no

computed data.

DME flag

All

DME has failed.

DME

DME

All

DME has no computed

data.

DME ---

Flight director flag

PRI in flight,

Flight director has failed.

PRI ground,

FD

IMC

TCAS fault

PRI in flight,

TCAS has a fault.

AIII approach,

TCAS

FAIL

IMC, VMC

Right (#2) IRS source

All

All IRS information used

or displayed by the HUD

ATT2

is taken from the right

(#2) IRS.

Glideslope flag

PRI in flight,

Glideslope data has

G

AIII approach,

failed.

/

S

IMC

10.42.17

Flight Instruments, Displays -

Head-Up Display System,

Symbology

Boeing 737 Operations Manual

SYMBOL

NAME

MODE

REMARKS

Ground speed

All

Ground speed has no

computed data.

---

Lateral deviation fault

PRI in flight,

Localizer deviation not

PRI ground

valid or VOR bearing not

LOC

valid.

Distance to next

PRI in flight,

Distance to next

waypoint

AIII approach,

waypoint has no

--- NM

IMC, VMC

computed data.

Decision height flag

PRI in flight,

Decision height data has

AIII approach,

failed.

DH

IMC

Displayed below 1500

feet radio altitude.

10.42.18

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