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Mode 2 has two submodes: Mode 2A and Mode 2B.
. 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 display GND PROX on the PFDs, 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 display PULL UP on the PFDs, and generate an aural “PULL UP” warning. The aural and visual warnings are annunciated continuously until the condition is rectified.
TAWS Mode 2A Figure 17.10.13
. 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 display GND PROX on the PFDs, 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 display PULL UP on the PFDs, and generate an aural “PULL UP” warning. The aural and visual warnings are annunciated continuously until the condition is rectified.
TAWS Mode 2B
Figure 17.10.14
NAVIGATION SYSTEMS Description Vol. 2 17.10.18
Oct 05/06
Mode 3 – Altitude Loss after Takeoff
Mode 3 provides warnings when the TAWS computer 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 TAWS computer 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 display GND PROX on the PFDs, 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.
TAWS Mode 3 Figure 17.10.15
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.
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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(12)
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