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. 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 display GND PROX on the PFDs, and generate an aural “TOO LOW TERRAIN” warning. Penetration of the alert area, below 190 knots, will display GND PROX on the PFDs, 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 17.10.19
Oct 05/06
TAWS Mode 4A Figure 17.10.16
. 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 display GND PROX on the PFDs, and generate a continuous aural “TOO LOW TERRAIN” warning. The aural and visual warnings remain until the airplane exits the envelope. Penetration of the alert area, below 159 knots, will display GND PROX on the PFDs, and generate an aural “TOO LOW FLAP” warning. These alerts can be deactivated by pressing the FLAPS OFF switch/light on the TAWS WARNING panel.
TAWS Mode 4B
Figure 17.10.17
NAVIGATION SYSTEMS Description Vol. 2 17.10.20
Oct 05/06
TAWS WARNING Panel & Locator Figure 17.10.18
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Mode 4C is based on a minimum terrain clearance, or floor, that increases with radio altitude during takeoff. At takeoff, the minimum terrain clearance (MTC) is at zero feet. As the aircraft ascends, the MTC is increased to 75% of the aircraft’s current (average of the previous 15 seconds) radio altitude. This value is limited to 500 feet AGL for airspeeds less than or equal to 190 knots. If the airspeed is greater than 190 knots, the MTC increases linearly with increasing airspeed up to 250 knots. Beyond 250 knots, the MTC is limited to 1,000 feet AGL. Any decrease in altitude below minimum terrain clearance will display GND PROX on the PFDs, and generate an aural “TOO LOW TERRAIN” warning.
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It is activated after takeoff when the gear or flaps are not in the landing configuration. It is also active during a low altitude go-around, if the aircraft has descended below 245 feet AGL.
TAWS Mode 4C Figure 17.10.19
Mode 5 – Descent Below Glideslope
Mode 5 provides two levels of alerting if the aircraft flight path descends below the glideslope. The first alert occurs whenever the aircraft is more than 1.3 dots below the beam, and is called a “soft alert” because the volume level is reduced. A second alert occurs below 300 feet radio altitude with greater than 2 dots’ deviation, and is called a “hard alert” because the volume is louder.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-CHAPTER 17 -导航系统 NAVIGATION SYSTEMS(13)
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