FEATURES

• Low Range Radio Altimeter
• Form & fit replacements of discontinued ALT-50A/-55B (see P/N chart below for specific replacement information)
• Intended for single installations certified for Category II landings and for dual or triple installations in Category IIIa (ALT-1000 is intended for single installations in Category II ONLY)
• Measures radar height above terrain up to 2,500 feet
• Accurate to within two feet at the critical low altitudes
• Entirely digital, allowing for complete end-to-end monitoring
• Frequency-Modulated Continuous Wave (FMCW) technology
• Versions with analog outputs capable of driving existing indicators
• Analog outputs in ALT-55B or ARINC 552A format - strap selectable
• Four ARINC 429 digital buses 
• Used with ANT-52 antennas
• Available with standard or shop-adjustable trips (see table below)
• Full temperature/altitude capability
• Stringent lightning and HIRF hardening
• Single unit packaged in a 3/8 ATR short-low package
• Package and aircraft mounting are identical to the ALT-55B
• Lightweight at 4.7 pounds with additional aircraft installation delay selections that can reduce antenna cable weight
• Front panel computer port for system configuration and access to system faults
• Computer interface that allows for flight simulation to aid checks of associated systems
• Versions compatible with Collins FPA-80 Flight Profile Advisory aural alert unit
• Versions available that directly plug in and replace the ALT-55B/-50A