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CHAPTER 1
GENERAL INFORMATION
The ALT-621 is a digital display tester used to test aircraft altimeters. Altitude is
displayed in feet and meters, with increments of 2, and 5 feet.
The ASP-621 is a digital display tester used to test aircraft airspeed indicators. Airspeed
is displayed miles per hour, kilometers per hour, and knots.
This manual is valid for the following models:
ALT-621-35 (altimeter with 35,000 feet capability)
ALT-621-50 (altimeter with 50,000 feet capability)
ASP-621-350 (airspeed with 350 knot capability)
ASP-621-650 (airspeed with 650 knot capability)
3
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