SUBJECT: Instruments
Question No. 1

The GPWS (Ground Proximity Warning System) is active for a height range from:

[ Total Que.:50 ]
0 ft to 5 000 ft measured by the radio altimeter.
50 ft to 5 000 ft measured by the radio altimeter.
50 ft to 2 500 ft measured by the radio altimeter.
0 ft to 2 500 ft measured by the radio altimeter.