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MINIMUMS” and “MINIMUMS” and are sounded only once during the
approach. (Other aural notification options may be selected and
programmed during system installation - monitor the callouts during selftest
for verification). If altitude callouts are not desired, selecting the RAD
ALT VOICE O/R switch on the O-RIDES panel (shown in Figure 9) will
inhibit the annunciation of callouts.
An aural notification of excessive bank angle is a standard option (others
are available for operator customizing). The business airplane bank angle
limits are set at forty degrees (40°) above 150 feet radio altitude. See
Figure 16. Below 150 feet, the bank angle limit is proportionally decreased
with altitude, down to ten degrees (10°) at thirty (30) feet. The feature is
inhibited below five (5) feet of altitude. If the airplane exceeds the bank
angle limit for altitude, an aural notification of “BANK ANGLE, BANK
ANGLE” is heard. If the bank limit is exceeded, the airplane must return to
a bank angle of thirty degrees (30°) or less to reset the excessive bank
callout.
G. Mode 7: Windshear Alerting:
If the airplane encounters environmental conditions often associated with a
windshear at lower altitudes, aural and visual caution and warning alerts
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-34-00
Page 29
October 11/01
Revision 5
are provided to the crew by mode 7 of the EGPWS. The operating
envelope for the windshear alert is shown in Figure 17.
Windshear alerting is computed using inputs from air data sensors for pitot/
static information, and accelerometers for sensing forces on the airplane.
The computer interfaces with the IRSs and DADCs for attitude and TAT
information, and with discretes for flap position and nutcracker switch data.
The computer generates windshear cautions and warnings that are
communicated via ARINC 429 bus inputs to the Symbol Generators for
display on the PFDs.
Mode 7 is operable between ten (10) and fifteen hundred (1500) feet radio
altitude during takeoff, approach or go-around. The Windshear Computer
detects suddenly changing headwinds and tailwinds, excessive updrafts
and downdrafts, and other factors indicating an impending microburst.
Moderate conditions of increasing headwind and updraft that do not
immediately hazard the airplane result in the aural message “CAUTION,
WINDSHEAR” over cockpit speakers and interphone, and the amber text
message WINDSHEAR displayed on the PFD. More severe conditions
(decreasing headwinds and downdrafts) prompt windshear warnings. The
aural warning “WINDSHEAR, WINDSHEAR, WINDSHEAR” is sounded,
and the red text warning WINDSHEAR is displayed on the PFD.
For both cautions and warnings, the aural message is repeated only once,
but the text message on the PFD remains in view until the airplane exits the
windshear conditions. The parameters that prompt the windshear cautions
/ warnings are adjusted as a function of available climb performance, flight
path angle, airspeeds that significantly vary from normal takeoff / approach
/ go-around speeds, and unusual fluctuations in Static Air Temperature
(SAT) often associated with microbursts.
4. Enhanced Mode Functions:
With the ability to compare accurate airplane position from FMS / IRS / GPS
systems with the terrain database stored within the computer, EGPWS is able to
improve the function of the seven basic modes of operation and provide the flight
crew with additional features.
A. Envelope Modulation:
EGPWS modifies the alert envelopes of some basic modes at specific
geographical locations where there are terrain features that are known to
cause nuisance alerts or to inhibit needed alerts. The alert envelope for
basic modes 4 (unsafe terrain clearance), 5 (excessive glideslope
deviation) and 6 (advisory callouts) is expanded at some locations that are
known to require additional terrain clearance, while at other locations
modes 1 (excessive descent rate), 2 (excessive terrain closure rate) and 4
(unsafe terrain clearance) are desensitized to avoid nuisance alerts
generated by known non-hazardous terrain.
B. Terrain Clearance Floor:
In conjunction with the Terrain Awareness Display (TAD), the Terrain
Clearance Floor (TCF) function alerts the flight crew at any time the
airplane descends below the TCF defined altitude regardless of airplane
configuration. The alert envelope is depicted in Figure 18. A descent below
the TCF will trigger the aural alert “TOO LOW TERRAIN” and the amber
text message TERRAIN on the PFD. This feature is operational at all times
OPERATING MANUAL
　
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