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Description
The TAWS alerts and warns the flight crew when the airplane’s flight path and position, relative to terrain, requires immediate crew attention and action. TAWS alerts the flight crew when predetermined thresholds are exceeded using the following modes:
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Mode 1 . Excessive descent rate
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Mode 2 . Excessive terrain closure rate
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Mode 3 . Altitude loss after takeoff or go-around
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Mode 4 . Unsafe terrain clearance when not in a landing configuration
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Mode 5 . Below glideslope deviation alert
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Mode 6 . Callouts
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Mode 7 . Windshear detection and alerting
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Terrain/obstacle awareness alerting and display (TAAD)
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Terrain clearance floor (TCF)
NAVIGATION SYSTEMS Description Vol. 2 17.10.15
Oct 05/06
TAWS Functional Schematic
Figure 17.10.11
NAVIGATION SYSTEMS Description Vol. 2 17.10.16
Oct 05/06
Components and Operation
TAWS Computer
The TAWS receives inputs from the air data system, radio altimeters, VHF navigation receivers, GPS, IRS, angle-of-attack vanes, gear and flap selector levers and TAWS panel switch/lights. These inputs are used to compute potential terrain conflicts.
Mode 1 – Excessive Descent Rate
Mode 1 provides aural and visual alerts and warnings, in the event that the TAWS computer determines that the rate of descent is excessive with respect to airplane altitude. The mode is active when the airplane is less than 2,500 feet AGL. Mode 1 requires radio altitude and rate of descent data.
The annunciation envelope consists of two areas: alert and warning.
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Penetration of the alert area will display GND PROX on the PFDs, and generate an aural “SINKRATE SINKRATE”. The aural alert will be annunciated once, and will be repeated only if conditions degrade by more than 20% based on computed time to impact. The visual alert will remain until the condition is rectified.
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Penetration of the warning area will display PULL UP on the PFDs, and generate an aural “WHOOP, WHOOP, PULL UP” warning. The aural warning is annunciated continuously until the condition is rectified
TAWS Mode 1 Figure 17.10.12
Mode 2 – Excessive Terrain Closure Rate
Mode 2 provides alerts and warnings when the TAWS computer detects that the closure rate between the airplane and terrain is excessive. The airplane need not be in descent, rising terrain may be encountered in level flight, or the terrain may be rising at a rate greater than the airplane rate of climb. Mode 2 uses radio altitude, vertical speed and aircraft configuration inputs.
NAVIGATION SYSTEMS Description Vol. 2 17.10.17
Oct 05/06
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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(11)
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