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.
10.22.4 D6-27370-866-EGP
Primary Mode - Low Visibility Takeoff
The primary mode includes special symbology used for a low visibility takeoff.
The display supports visual runway centerline tracking and enhances situational
awareness.
Note: Approval must be obtained from the appropriate regulatory authority prior
to conducting HUD low visibility takeoff operations.
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 HUD derived ground roll guidance cue provides
lateral guidance relative to the ground roll reference symbol to track the localizer.
The ground localizer line provides raw localizer information any time the aircraft
is on the ground and the Captain’s navigation receiver is tuned to a localizer
frequency. The localizer deviation is presented relative to the selected course mark
on the horizon.
A ground localizer scale and pointer indicates localizer deviation relative to the
Captain’s nav receiver localizer bearing.
Primary Mode - Approach and Landing
If the primary mode is used for an approach and landing, flight director guidance
and navigation raw data is displayed. Once on the ground, the ground localizer
line and ground localizer scale is displayed (if an ILS frequency is tuned on both
nav receivers) to enhance centerline tracking.
AIII Approach Mode
The HUD AIII mode is specifically designed for manual ILS approach and
landing operations to CAT II or CAT IIIa minimums. Altitude and airspeed tape
displays are replaced with digital values. The HSI is also replaced with ILS raw
data displayed in proximity to the flight path group around the center of the
display. In the AIII mode, flight path guidance is provided by the guidance cue
which is derived from internal approach and landing guidance algorithms, and is
independent of any AFDS derived or displayed flight director guidance.
Note: Approval must be obtained from the appropriate regulatory authority prior
to conducting HUD Cat II or CAT IIIa operations.
AIII mode is dependent on the availability of all required systems and ILS
approach criteria. Because of these requirements, the AIII mode is not identified
as a selectable standby mode until these requirements are met. AIII capability is
displayed on the control panel at any time, and on the combiner after LOC and G/S
capture in the PRI mode.
September 26, 2013
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