737 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System
Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 10.22.3
Primary (PRI) Mode
The primary mode may be used during all phases of flight from takeoff to landing.
This can include low visibility takeoff operations utilizing ground roll guidance,
all enroute operations and either non-precision or precision approaches to CAT I
or II minimums utilizing flight director guidance and/or raw data.
Attitude information is displayed in the form of a horizon line and pitch scales
positioned relative to an airplane reference symbol. Airspeed and altitude are
displayed in tapes along the left and right edges of the display. A sectored HSI is
displayed in flight in the lower center of the display. On the ground, the HSI, flight
path and guidance cue are not displayed. These symbols are automatically
displayed once the aircraft is in flight.
During takeoff, a TOGA pitch target line and a guidance cue are displayed. The
TOGA pitch target line is displayed as a horizontal dash line initially positioned
at the top of the display. As the pitch attitude increases during rotation, its vertical
position relative to the airplane reference symbol is adjusted to display the pitch
command from the Captain’s flight director. Initially, the flight director guidance
cue is displayed when the airplane reference is within 2 degrees of the TOGA
pitch target line or when climbing through 50 feet radar altitude, whichever occurs
first. The TOGA pitch target line remains until the TO/GA mode is exited. The
flight director guidance cue is displayed throughout flight when the Captain’s
flight director is selected on and both pitch and roll commands remain valid.
A full time slip-skid symbol is displayed as part of the roll scale. During any
takeoff (after rotation) or go-around (below 1000 feet), additional slip-skid
symbols are displayed to enhance lateral control in the event of an engine failure.
These two additional symbols are displayed relative to the airplane reference and
the flight path symbols and are removed above 1500 feet.
AFDS engaged modes, autothrottle modes and autopilot status is indicated across
the top of the display similar to the flight mode annunciator display. Navigation
information is displayed dependent on the selected navigation source and active
AFDS mode. During LNAV operations, vertical and lateral deviations are
similarly displayed based on FMC data. During ILS/VOR operations, course
deviation is displayed within the HSI. Glideslope data is presented on a glideslope
deviation scale adjacent to the altitude tape.
If the HUD is in a mode other than primary, depressing a TO/GA switch activates
the primary mode independent of the standby mode indicated on the HUD control
panel.
September 26, 2013
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