737 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System –
Controls
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 10.17.3
2 Primary (PRI) Mode
• Push "HGS MODES" < PRI line select key.
• This selects primary mode and the mode indicated on the MCDU "HGS
MODES" page will change to Primary.
The low visibility takeoff display incorporates a ground roll reference symbol,
ground roll guidance cue, and a ground localizer line (if an ILS frequency is tuned
on both nav receivers). The HGS derived ground roll guidance cue provides lateral
guidance relative to the ground roll reference symbol to track the localizer
When Primary mode is selected on the MCDU panel, PRI is highlighted and the
caret ("<") next to PRI is removed.
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 CAT II minimums utilizing flight director guidance and/or raw data.
Attitude information is displayed as a horizontal 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 cues are not displayed. These
symbols are automatically displayed once the aircraft is in flight.
During takeoff, a TO/GA (Takeoff/Go Around) pitch target line and a guidance
cue are displayed. The TO/GA 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 pilot’s flight director. Initially, the
flight director guidance cue is displayed when the airplane reference is within 2 °
of the TO/GA pitch target or when climbing through 50 feet radar altitude,
whichever occurs first. The TO/GA pitch target line remains until the TO/GA
mode is exited. The flight director guidance cue is displayed throughout flight
when the pilot’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.
March 27, 2014
To Next Page
Loading...
