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that is equal to or exceeds 75% of the radio altitude averaged over the
previous fifteen (15) seconds, with no decrease. This envelope is upwardly
limited at 500 feet radio altitude at airspeeds less than 190 knots, and
expands linearly to 1000 feet at 250 knots. If airplane climb does not meet
the envelope gradients, an aural alert “TOO LOW TERRAIN” is heard and
the TERRAIN text alert is displayed on the PFD.
E. Mode 5: Excessive Deviation Below Glideslope:
Mode 5 provides terrain clearance alerts during ILS approaches. The alerts
are triggered at two different levels, depending upon how closely the
airplane is aligned with the glideslope and the terrain clearance available
below the airplane. The alerting envelope is shown in Figure 15. For
glideslope alerts to be operative, the airplane must be within two (2) dots of
localizer centerline, gear and flaps in the landing configuration and a valid
front course ILS signal received. As the airplane descends below 1000 feet
radio altitude on the localizer, any deviation below glideslope center that
exceeds 1.3 dots prompts an aural “GLIDESLOPE” alert and illumination of
the BELOW G/S lights below the cockpit glareshield. This aural alert is
sounded at only half of the volume of normal aural alerts, and is called a
“soft” alert. If the airplane deviates twenty percent (20%) further from the
1.3 dot displacement, the “soft” alert is repeated at increasingly faster
rates.
The BELOW G/S light is a dual function switchlight installation. The top half
of the switchlight is labelled BELOW G/S and illuminates amber when the
airplane deviates outside of the glideslope alerting envelope. The bottom
half of the light is labelled G/S INHIBIT. Pushing the switchlight will inhibit
further glideslope alerts. When the inhibit function is selected by pushing
the switchlight, the legend G/S INHIBIT illuminates blue. The inhibit
switchlight may be used to cancel Mode 5 alerts at any time the airplane is
below 2000 feet radio altitude. Once cancelled, Mode 5 alerting is reset
when the airplane descends below 30 feet, climbs above 2000 feet or the
ILS frequency is deselected then retuned. Mode 5 would then be available
for a subsequent approach in the event of a go-around
As the airplane descends to 300 feet and lower during the ILS approach, a
deviation from glideslope center of two (2) dots or more prompts aural
alerts “GLIDESLOPE” at normal (louder) volume. The aural alert is
sounded every three (3) seconds until the airplane returns to within 1.3
dots of glideslope center.
Both the 1.3 dot “soft” alert and the 2 dot normal aural alerts are
desensitized below 150 feet radio altitude to allow for glideslope beam
variations and to reduce the possibility of nuisance (unwarranted) alerts.
If the airplane is maneuvering at low altitude to capture the localizer for an
ILS approach, the upper altitude limit of the glideslope deviation alert
envelope is reduced to 500 feet radio altitude if the airplane is descending
at less than 500 FPM.
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OPERATING MANUAL
2A-34-00 PRODUCTION AIRCRAFT SYSTEMS
Page 28
October 11/01
Revision 5
F. Mode 6: Advisory Callouts:
The mode 6 advisory callouts are aural notifications of specific altitudes
and excessive bank angle. There are no visual text messages or displays
associated with mode 6. The specific altitudes announced over the cockpit
speakers and interphone system are selected upon installation of the
EGPWS system, as are the optional instrument approach minimum altitude
and excessive bank angle callouts. The following altitude callouts are most
commonly selected, but others may be selected by individual operators.
Different selections should be noted by system placards in the cockpit (if
confirmation of selected altitudes is required, note the callouts during
EGPWS self-test):
• “ONE THOUSAND”
• “FIVE HUNDRED”
• “FOUR HUNDRED”
• “THREE HUNDRED”
• “TWO HUNDRED”
• “ONE HUNDRED”
• “FIFTY”
• “FORTY”
• “THIRTY”
• “TWENTY”
• “TEN”
The above listed aural callouts are sounded by the EGPWS when the radio
altitude associated with the callout is reached. In addition to these
standardized callouts, aural notification of descent within one hundred feet
(100’) of instrument approach minimum altitude and reaching approach
minimum altitude will take place if the crew has manually entered the
minimum altitude (MDA or DH). The callouts are “APPROACHING
　
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