GROUND PROXIMITY WARNING SYSTEM (GPWS)

#1. The GPWS the alert/warning information is provided by a radio altimeter with:

• Aa downward transmitting beam whose dimensions are in the order of 60 and 30 in the fore/aft and the athwartship axes.
• Ba downward transmitting beam whose dimensions are in the order of 30 and 60 in the fore/aft and the athwartship axes.
• Ca forward transmitting beam
• Da downwards transmitting radio beam

#2. The GPWS would provide visual and audible warning to a pilot if the aircraft descended

• Ato below 500' radio altitude with flaps not in the landing position and speed below Mach.28
• Bto below 500' radio altitude with flaps not in the landing position and speed below Mach.35
• Cto below 200' barometric altitude with flap not in the landing position and speed below Mach.28
• Dto below 200' radio altitude with flap not in the landing position and speed below Mach.28.

#3. The Ground Proximity Warning mode 5 provides a visual and audible warning to the pilot if the aircraft:

• Adescends below 500ft radio altitude with gear retracted.
• Bis below 1000ft radio altitude and more than 1.3 dots below the ILS glidepath.
• Cdescend below 200ft radio altitude with flaps retracted
• Dsinks more than approximately 10% of accumulated altitude.