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NAVIGATION SYSTEMS Description Vol. 2 17.10.23
Oct 05/06
TAWS Mode 6 Bank Angle Figure 17.10.22
Mode 7 – Windshear Detection and Alerting
Mode 7 provides alerts and warnings in the event that significant windshear is detected by the TAWS computer. Mode 7 is active during takeoff and landing phases of flight only, between 10 and 1,500 feet AGL.
TAWS Mode 7 Windshear Thresholds
Figure 17.10.23
NAVIGATION SYSTEMS Description Vol. 2 17.10.24
Oct 05/06
There are two types of windshear warnings: increasing performance (updraft/headwind), and decreasing performance (downdraft/tailwind).
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For an increasing performance shear (updraft/headwind), an amber WINDSHEAR message is annunciated on the PFD and flashes for 5 seconds, then remains steady. No aural message is given.
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For a decreasing performance shear (downdraft/tailwind), a red WINDSHEAR message is annunciated on the PFD and flashes for 5 seconds, then remains steady, and an aural siren and “WINDSHEAR, WINDSHEAR, WINDSHEAR” warning are activated. Two seconds after a windshear warning is issued, the autopilot, if engaged, is disconnected and the flight director bars are removed. No escape guidance is provided.
PFD Windshear Display Figure 17.10.24
Terrain Clearance Floor (TCF)
The TCF function of the TAWS provides an additional terrain clearance alert envelope around airports. This alert mode complements the existing Mode 4 protection, by providing an alert based on insufficient terrain clearance even when in landing configuration.
TCF creates an increasing terrain clearance envelope around the intended airport runway, directly related to the distance from the runway. TCF alerts are based on current airplane location, nearest runway center point position and radio altitude, with an integral TCF airport database.
Penetration of the alert envelope will display GND PROX on the PFDs, and generate an aural “TOO LOW TERRAIN” alert. The aural alert is repeated twice, and again thereafter if the radio altitude value decreases by more than 20% from the altitude at which the initial warning was issued. The aural and visual alerts operate until the airplane exits the alert envelope.
Terrain Clearance Floor Database
The TCF database is integral to the TAWS computer, and includes worldwide coverage of all airports with hard-surfaced runways longer than 3,500 feet in length.
NAVIGATION SYSTEMS Description Vol. 2 17.10.25
Oct 05/06
Terrain Clearance Floor (TCF) Figure 17.10.25
Terrain/Obstacle Awareness Alerting and Display (TAAD)
A feature of the TAWS is the incorporation of the terrain/obstacle awareness alerting and display function. This function uses aircraft geographic position, aircraft altitude, and a terrain and obstacle database, to predict potential conflicts between the aircraft flight path and the terrain or obstacle, and to provide terrain display overlay of the conflicting terrain or obstacles.
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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(15)
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