.  
both VHF navigation receivers tuned to the same ILS frequency, and

.  
NAV switch in NORMAL, and

.  
the reference glideslope angle is between -2.5 and -3.0 degrees, and

.  
IRS transfer switch in NORMAL with both IRSs in NAV mode, and

.  
ILS capture criteria satisfied, and

.  
Display Source switch in the AUTO position, and

.  
Displays Control Panel switch in the NORMAL position, 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 reversion to NP mode.
Copyright . The Boeing Company. See title page for details.
10.22.4   June 1, 2003

Flight Instruments, Displays -Head-Up Display System
Description
737 Flight Crew Operations Manual
Once AIII is armed, no further pilot action is required to activate the AIII mode. When active, the AIII mode symbology and related annunciations are displayed on the combiner, the CDU 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. The first officer’s NO AIII annunciation is also illuminated. The annunciation will remain until another mode is selected.
Declutter Display
The declutter display is intended for low visibility approaches but may be selected at any time when available. In general, the declutter mode differs from the normal display in that the speed and altitude tapes are removed and replaced with digital readouts. Declutter format is not available in ground mode, TOGA mode or during unusual attitude.
TCAS Resolution Advisory
TCAS resolution advisories are displayed as preventive and corrective symbols, and are similar to the pitch commands displayed on the attitude indicator.
Preventive advisories do not require any crew action, but indicate an unsafe zone, and are displayed as a TCAS bracket centered on the flight path vector. On the unsafe side of the TCAS bracket, two angled lines are extended from the corners and flash until the flight path vector is on the safe side of the bracket. The “TCAS” annunciation moves under the bank scale after 5 seconds.
Corrective advisories require positive action by the crew and are displayed as a TCAS bracket with a “T” symbol displayed inside the guidance cue. The “T” symbol indicates that TCAS guidance is active. On the unsafe side of the TCAS bracket, two angled lines are extended from the corners and flash until the flight path vector is on the safe side of the bracket. The “TCAS” annunciation moves under the bank scale after 5 seconds.
For additional information on TCAS, refer to Chapter 15, Warning Systems.
Failure Flags and Data Source Annunciations
Failure flags are displayed for invalid sensor status. These flags are generally indicated by boxed annunciations for the affected parameters, and in the case of failure, the removal of all symbols related to the fault. In some cases, symbols are removed as a result of other symbols being removed due to a fault.
Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -Head-Up Display System Description 737 Flight Crew Operations Manual

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Copyright . The Boeing Company. See title page for details.
10.22.6  June 1, 2003

737 Flight Crew Operations Manual

Introduction
The primary flight displays (PFDs) present a dynamic color display of all the parameters necessary for flight path control. The displays provide the following information:
.
flight mode annunciation . radio altitude

.
airspeed . instrument landing

.
altitude system display

.
vertical speed . approach minimums

.
attitude . heading/track indications

.
steering information . TCAS indications

. GPWS annunciations.
Failure flags are displayed for airplane system failures. Displayed information is removed or replaced by dashes if no valid information is available to the display system (because of out–of–range or malfunctioning navigation aids). Displays are removed when a source fails or when no system source information is available.
Flight mode annunciations are described in Chapter 4, Automatic Flight.
Airspeed
YA721 - YA809, YC411, YC413, YK101 - YK104 Airspeed is displayed on a tape and in a digital window on the left side of the PFD. The current Mach number is digitally displayed below the airspeed tape when the current Mach number is greater than 0.40. An airspeed trend vector indicates predicted airspeed in 10 seconds. Selected airspeed is displayed above the airspeed tape.
　
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