ENHANCED GROUND PROXIMITY WARNING SYSTEM (TYPE II)
General
The Honeywell EGPWS is a Terrain Awareness and Warning System (TAWS) providing
basic GPWS functions plus additional enhanced terrain alerting and display features. The
system operates independent of the Integrated Alerting Unit.
The EGPWS/TAWS system receives inputs from:
• ADC (1)
• Radio Altimeter
• AHRS 1
• TAWS Temperature probe (OAT)
• ILS
• EFIS
• Internal GPS
• Internal terrain-, airport- and obstacle databases.
The system continuously monitors the aircraft fli
ght path / position with regard to terrain. If
the projected flight path should lead to inadvertent proximity to terrain, the system generates
visual and aural warnings. These warnings persist for as long as the aircraft has a dangerous
proximity or closure rate to terrain.
NOTE:
Position information for TAWS alerting is calculated from GPS data and is
independent of FMS position. Consequently, FMS position errors do not
affect TAWS functionality.
The EGPWS/TAWS provides the following warnings and/or alerts:
• Mode 1: Excessive descent rate.
• Mode 2: Excessive closure to terrain.
• Mode 3: Altitude loss after take-off or go-around.
• Mode 4: Inadvertent proximity to terrain.
• Mode 5: Excessive deviation below the ILS glide slope.
• Mode 6: Call-outs during approach for selected DH and a
pre-determined Radio Altitude.
Excessive Bank Angle alert.
Basic GPWS functions
• Terrain CIearance Floor (TCF).
• Runway Field Clearance Floor (RFCF)
• Terrain Ahead Alerting.
TAWS functions
NOTE: The TAWS will also provide a warning/alert display of slow descents into
unprepared terrain while in the landing configuration.
Fokker 50 - Flight Navigation Instruments
To Next Page