Baggrunden for BL 1-16 er ICAO’s krav i Annex 6 til Chicago Konventionen om EGPWS i turbine- og stempelmotordrevne flyvemaskiner med en MTOM på mere end 5.700 kg eller med plads til mere end 9 passagerer.
Definitioner/Terminologi
GPWS: Ground Proximity Warning System, med følgende mulige funktioner:
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Mode 1: Excessive descent rate
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Mode 2: Excessive closure rate to terrain
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Mode 3: Negative climb rate or altitude loss after takeoff
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Mode 4: Unsafe terrain clearance while not in landing configuration
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Mode 5: Excessive downward deviation from an ILS glideslope
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Mode 6: Advisory voice callouts, "Five Hundred" when descends to 500 feet
EGPWS: Enhanced GPWS
TAWS: Terrain Awareness Warning System
FLTA: Forward Looking Terrain Avoidance
GPWS + FLTA = EGPWS = TAWS