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• Mode 2A – Activated when flaps are not in the landing position and the aircraft is not in
the GS beam. Penetration of the alert area will illuminate the GND PROX switch/lights
on the glareshield and generate an aural “TERRAIN, TERRAIN”. The aural is
annunciated once, and the visual alert will remain displayed, until the condition is
rectified. Penetration of the warning area will illuminate the PULL UP switch/lights on the
glareshield and generate an aural “PULL UP” warning. The aural and visual warnings
are annunciated continuously until the condition is rectified.
EGPWS Mode 2A
Figure 17−10−20
• Mode 2B – Activated when flaps are in the landing configuration, or in the event the flaps
are up and the airplane is on an ILS approach, and the glideslope and localizer
deviations are less than ±2 dots and for 60 seconds after takeoff. Penetration of the alert
area will illuminate the GND PROX switch/lights on the glareshield, and enable an aural
“TERRAIN, TERRAIN”. The aural and the visual alerts are annunciated continuously,
and will remain until the condition is rectified. Penetration of the warning area will
illuminate the PULL UP switch/lights on the glareshield, and generate an aural “PULL
UP” warning. The aural and visual warnings are annunciated continuously until the
condition is rectified.
EGPWS Mode 2B
Figure 17−10−21
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−26
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
Mode 3 – Altitude Loss after Takeoff
Mode 3 provides warnings when the EGPWC detects that a significant amount of altitude is lost
immediately after takeoff, or during a go-around. Mode 3 uses radio altitude, barometric altitude
and altitude rate.
If a descent is initiated following takeoff or go-around, the EGPWC stores the altitude value at
which the descent began, and compares successive altitude data to the stored value. Activation
of the warning is induced when the minimum terrain clearance, as a function of altitude lost, is
exceeded.
Penetration of the alert area will illuminate the GND PROX switch/lights on the glareshield, and
generate an aural “DON’T SINK, DON’T SINK” warning. The aural warning is annunciated only
once, unless the altitude value degrades by more than 20% from the initially stored value, and
again at each additional 20% degradation from the initially stored value. This condition will
remain until the airplane regains the initial altitude value. Mode 3 is inhibited for radio altitude in
excess of 1,500 feet.
EGPWS Mode 3
Figure 17−10−22
Mode 4 – Unsafe Terrain Clearance
Mode 4 provides alerts and warnings for insufficient terrain clearance, based on airplane phase
of flight and airspeed. Mode 4 requires radio altitude, computed airspeed, gear position and flap
position inputs. The alert and warning envelopes are based on minimum allowable terrain
clearance, as a function of computed airspeed.
Mode 4 is divided into 3 submodes: Mode 4A, Mode 4B and Mode 4C.
• Mode 4A – Active when the airplane is in cruise or approach phase of flight, and the
landing gear is not in the landing position. The alert envelope for Mode 4A begins at
30 feet AGL, and extends vertically to an altitude of 500 feet AGL. Penetration of the
alert area, above 190 knots (the upper boundary increases with airspeed to a maximum
of 1,000 feet radio altitude at 250 knots or more) will illuminate the GND PROX
switch/lights on the glareshield, and generate an aural “TOO LOW TERRAIN” warning.
Penetration of the alert area, below 190 knots, will illuminate the GND PROX
switch/lights on the glareshield, and generate an aural “TOO LOW GEAR” warning. The
aural and visual warnings remain until the airplane exits the envelope.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−27
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
ENHANCED GROUND PROXIMITY WARNING SYSTEM (EGPWS) (CONT'D)
EGPWS Mode 4A
Figure 17−10−23
• Mode 4B – Active when the airplane is in cruise or approach phase of flight, and the
landing gear is in the landing position, with flaps not in the landing configuration. The
alert envelope for Mode 4B extends vertically to an altitude of 245 feet AGL. Penetration
of the alert area, above 159 knots, will illuminate the GND PROX switch/lights on the
glareshield, and generate a continuous aural “TOO LOW TERRAIN” warning. The aural
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庞巴迪挑战者604操作手册 Operating Manual 4(68)
