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RAD ALT 1 - 2 FAIL Indicated radio altimeter(s) has failed
4. Limitations:
There are no limitations associated with this system at the time of this revision.
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SPZ-8000 Radar Altitude Display
Figure 6
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SPZ-8400 Radar Altitude Display
Figure 7
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2A-34-50: Enhanced Ground Proximity Warning System (EGPWS)
1. General Description:
The Enhanced Ground Proximity Warning System (EGPWS) is installed during
production beginning with airplanes Serial Number (SN) 1390 and subsequent.
(The following system description is applicable to the production installed system
only. Operators with systems installed by completion outfitters should consult the
documentation supplied by the outfitter.) EGPWS provides aural and visual alerts
to prevent Controlled Flight Into Terrain (CFIT). Alerts are generated in conditions
of terrain clearance danger, severe windshear and excessive deviation below an
Instrument Landing System (ILS) glideslope. EGPWS also provides aural
notification of excessive bank angles and provides height above runway callouts,
including approach minimums, during final approach.
2. Subsystems, Units and Components:
The EGPWS consists of a computer and geographical database interfaced with
the SPZ-8400 DAFCS and airplane subsystems over ARINC 429 busses and
discrete connections for data sensing and display presentation. See the system
diagram in Figure 8. The system uses inputs from the DADCs, radio altimeter,
FMS/GPS/IRS, angle of attack (AOA), landing gear and flap position, navigation
data and a manually entered approach decision height. This information is
integrated with the database in the computer to produce the aural and visual alert
messages and the Terrain Awareness Display (TAD) graphic on the cockpit EFIS
displays. (The TAD is usually selected to the NAV display, however, the Display
Controller has an EGPWS option that allows selection of the TAD to the PFD, with
the TAD shown on the HSI similar to the radar display.) Aural alerts and warnings
are transmitted over cockpit speakers and through the cockpit interphone system,
while alert and warning text messages are displayed on the Primary Flight Display
(PFD). EGPWS aural alerts and warnings, except the windshear alert / warning
can be inhibited with the GPWS VOICE O-RIDE switch on the O-RIDES panel on
the center pedestal, shown in Figure 9 (location may vary).
The computer is located in the right electronic equipment rack and is powered
from φC of the Left Main 115V AC bus and the Left Main 28V DC bus. The system
operates in seven (7) distinct modes:
• Mode 1 - Excessive descent rate.
• Mode 2 - Excessive terrain closure rate
• Mode 3 - Altitude loss after takeoff
• Mode 4 - Unsafe terrain clearance
• Mode 5 - Excessive deviation below glideslope
• Mode 6 - Advisory callouts
• Mode 7 - Windshear alerting
The basic seven modes of operation are available in earlier model GPWS
systems, with the alerts and warnings formulated using only airplane sensor data
(airspeed, radio altitude, etc.). With the EGPWS, the ability to compare present
airplane position, and predicted flight path vectors with data in the geographical
database provides expanded warning envelopes and display options that
increase situational awareness.
System enhancements improve the basic modes of operation and offer features
not previously available. A Terrain Awareness Display (TAD) feature provides a
graphic of terrain ahead of the airplane’s current flight path. The TAD graphic is in
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multicolor and can be selected for continuous view on the NAV display (or PFD in
the HSI position). If not selected for continuous view, the TAD will automatically
“pop up” on the NAV display when the EGPWS computer detects terrain conflicts.
Terrain displayed is within the range selected. The display range is adjusted with
the same control as the weather radar, however if the TAD is not selected for
continuous display and subsequently “pops up” the default range is ten (10)
nautical miles - the range may then be adjusted from the default value. On the
TAD, the color red is used to indicate the highest and most hazardous terrain
areas, yellow (in varied intensity) identifies less dangerous terrain at elevations
　
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