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EGPWS Runway Field Clearance Floor (RFCF)
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EGPWS Runway Awareness and Advisory System (RAAS)
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T2CAS Collision Prediction and Alerting (CPA)
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T2CAS Premature Descent Alert (PDA).
It includes runways longer than 3 500 ft (1 067 m) worldwide and runways longer than 2 000 ft (610 m) locally.
4.1.1.4. AIRCRAFT PERFORMANCE DATABASE
The T2CAS includes an Aircraft Performance database. The T2CAS Collision
Prediction and Alerting (CPA) function takes into account the aircraft
performances for the computation of escape maneuvers. The Aircraft Performance database provides conservative climb rates taking into account aircraft weight, altitude, SAT, landing gear and flap/slat configuration, engine out conditions.
4.1.2. REACTIVE (BASIC) TAWS FUNCTIONS
The following table summarizes the different reactive TAWS functions. The penetration of a warning area triggers the call-out written inside. The charts are illustrative. The figures on the coordinate axis may slightly differ from a TAWS model to another (EGPWS or T2CAS). However, principles remain the same. For more details, refer to your FCOM.
Mode 1 – Excessive Descent Rate Mode 2A – Excessive Terrain Closure Rate Flaps not in landing configuration
Mode 2B – Excessive Terrain Closure Rate Flaps in landing configuration Mode 3 – Excessive Altitude Loss after Take-off
- 4-5 -
Mode 4A – Unsafe Terrain Clearance Gear up and flaps not in landing configuration Mode 4B – Unsafe Terrain Clearance Gear down and flaps not in landing configuration
Mode 4C – Unsafe Terrain Clearance (EGPWS only) Gear up or flaps not in landing configuration Mode 5 – Excessive Glide Slope Deviation
Note: T2CAS Mode 2 is inhibited to avoid inadvertent alerts during approaches.
When there is a lateral position error, T2CAS reactivates Mode 2. For the same
purposes, EGPWS applies an envelope modulation (refer to 4.1.2.1.1 – EGPWS Envelope Modulation).
4.1.2.1. EGPWS MODE 6: EXCESSIVE BANK ANGLE
The EGPWS mode 6 is an option only available on A300/A310 family aircraft. It triggers a BANK ANGLE BANK ANGLE aural alert when entering the alert area and each time the roll angle increases by 20%.
4.1.2.1.1. EGPWS Envelope Modulation
The Envelope Modulation function adapts the caution and warning envelopes according to the aircraft lateral position (GPS or FMS). The objective is to avoid inadvertent cautions and warnings during approaches to some airports (e.g. rising terrain just before the runway threshold, airport altitude significantly higher than the surrounding terrain altitude).
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