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speakers and headsets, and a red PULL UP text message is displayed on
the PFD. The aural and text annunciations will continue until terrain
clearance is sufficient that the warning envelope is cleared. If terrain
clearance does not continue to increase, the TERRAIN aural and text
alerts will continue. In all instances, the visual text alert will continue to be
displayed on the PFD until the airplane has gained 300 feet of altitude,
forty-five (45) seconds have elapsed, landing flaps have been selected or
the flap override switch has been activated.
OPERATING MANUAL
2A-34-00 PRODUCTION AIRCRAFT SYSTEMS
Page 26
October 11/01
Revision 5
Sub-mode 2B is a desensitized alert and warning envelope that is
automatically activated when landing flaps are selected (or flap override
activated), or when within two (2) dots of the centerline of glideslope and
localizer during an ILS approach. See Figure 12. This mode is also active
during the first sixty (60) seconds after takeoff. The alerts and warnings in
sub-mode 2B are the same as those in sub-mode 2A, with additional
provisions that if the airplane enters the boundaries of the warning
envelope without gear or flaps in the landing configuration, the aural
“TERRAIN, TERRAIN” alert will sound with the accompanying text
message on the PFD. Further penetration of the envelope will result in
“PULL UP” aural warnings and text message until the airplane exits the
envelope or the airplane configuration is corrected. If the airplane
configuration is correct for landing (gear and flaps down), and a hazardous
terrain closure rate exists, the “PULL UP” aural and text warnings are
suppressed, and the “TERRAIN” aural and text alerts are prompted until
the airplane exits the sub-mode 2B envelope.
C. Mode 3: Altitude Loss after Takeoff:
This mode provides an aural alert for any significant altitude loss after
takeoff or when performing a go-around at an altitude of less than two
hundred forty-five feet (245’) radio altitude with the gear and flaps not in the
landing configuration. The alert envelope, shown in Figure 13, is predicated
upon the amount of terrain clearance available below the airplane versus
sink rate. Any significant loss of altitude prompts an aural alert of “DON’T
SINK, DON’T SINK”. The aural alert is sounded twice only, unless there is
a continued loss of altitude clearance.
D. Mode 4: Unsafe Terrain Clearance:
Mode 4 is subdivided into three sub-modes to address specific phases of
flight, airplane configurations and airspeeds. The sub-modes 4A, 4B and
4C are active in circumstances similar to those that prompt alerts and
warnings under Mode 2 and Mode 3, but provide increased situational
awareness when hazardous conditions are not as immediate.
Sub-mode 4A is active during cruise and approach with gear and flaps up,
with the alerting envelope predicated on speed and altitude. See Figure 14.
(This envelope also provides additional protection against a gear-up
landing). Flying in altitude and airspeeds from 1000 feet radio altitude at a
speed of 250 knots down to an altitude of 500 feet and a speed of 190
knots prompts an aural “TOO LOW TERRAIN” alert over speakers and
headsets and an amber text message TERRAIN on the PFD. If the airplane
is still in the clean configuration below 500 feet and at less than 190 knots,
the aural alert changes to “TOO LOW GEAR”. Either of these aural alerts is
sounded only once, unless there is further decrease of altitude / airspeed of
twenty percent (20%) or more.
Sub-mode 4B operates during cruise and approach with the landing gear
down, but with the flaps not in landing configuration. See the envelope
depicted in Figure 14. Below 1000 feet at 250 knots down to 245 feet at
159 knots with the flaps not fully extended prompts a “TOO LOW
TERRAIN” aural alert and the display of an amber TERRAIN on the PFD.
Below 245 feet and less than 159 knots, the aural alert changes to “TOO
LOW FLAPS”. The aural alerts are sounded only once unless there is a
further twenty percent (20%) degradation of clearance.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-34-00
Page 27
October 11/01
Revision 5
Sub-mode 4C operates during climbout toward rising terrain that produces
a decrease in vertical clearance, but is not severe enough to prompt
activation of mode 2. See the alert envelope shown in Figure 15. After
takeoff or a go-around below 245 feet, and the gear and flaps not in landing
configuration, the airplane must continue to gain terrain clearance at a rate
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湾流4操作手册 Gulfstream IV Operating Manual 2(115)
