The Atlantis Avionics ARA-552 Radio Altimeter Test Set facilitates testing of analogue altimeters by providing simulated aircraft radio altitude information in a flight-line environment. The ARA-552 Analog Adapter allows testing of aircraft autoland systems, ground proximity warning systems, and installed altimeter systems. The ARA-552 Test Set may be used whenever active control of the radio altitude bus is a test requirement.

• Can interface directly to aircraft wiring or simulating altimeter
• Displays altimeter output DC voltage converted to feet of altitude, according to altimeter specifications. ARINC 552 DC altitude voltage conversion circuitry for display of altimeter output voltage in feet, with a resolution of one foot
• Can simulate the altitude trip relays of a removed altimeter according to one of four preprogrammed banks of set points
• Triple frequency synthesizers and output conditioning circuitry for 860F-1/4 test signals
• Consistent interpretation/operation, regardless of the altimeter being tested
• Operates from internal battery or AC line power
• Drives up to three altimeters independently
• Generates DC altitude voltages according to one of four programmed relationships to simulate a removed altimeter
• Can simulate the autopilot warn and system flag relays of a removed altimeter
• Displays FLAG, TRIP, and A/P WARN RELAY contact closures
• Self-test controls for altimeter under test
• Microprocessor-based design for high accuracy