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 10.22.5
ILS approach criteria requirements are satisfied when:
• Both VHF navigation receivers tuned to an ILS frequency, and
• VHF #1 or VHF #2 localizer deviation is less than approximately ¼ dot
and glideslope deviation is less than approximately 1 and ¼ dots for at
least five seconds, and
• The difference between the airplane’s magnetic track and the captain’s
selected course is less than 15 degrees, and
• Radio altitude is greater than 500 feet.
Note: Once these criteria have been satisfied, subsequent deviations outside the
criteria prior to AIII mode selection, will result in a loss of ability to select
the AIII mode.
Automatic AIII mode arming requirements are satisfied when:
• PRI or IMC mode selected, and
• all required systems operating normally (AIII capable), and
• ILS frequency tuned on VHF NAV receiver No. 1 or No. 2, and
• radio altitude is greater than 500 feet, and
• TOGA mode not active.
Once the AIII mode is active, the AIII mode symbology and related annunciations
are displayed on the combiner, the control panel display, and the HUD annunciator
panel.
Any sensor or equipment condition that results in a loss of AIII capability will
cause a NO AIII annunciation displayed on the combiner and on the control panel
display. The first officer’s AIII annunciation is also extinguished. The
annunciation will remain until another mode is selected or AIII capability is
regained.
Below 500 feet radar altitude, with a loss of AIII capability or if the approach or
flare performance does not ensure a safe touchdown within the required
touchdown zone, an APCH WARN annunciation will be displayed on the
combiner and on the HUD annunciator panel.
To activate AIII ARM, push the STBY function key on the HUD control panel.
When armed, “A
III ARM” is displayed on the standby mode display line and “AIII
ARM” is displayed on the combiner. Approximately five seconds after the
requirements for ILS approach criteria are satisfied, the AIII mode is
automatically activated.
September 26, 2013
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