Radio Altimeter, Model: ALT55B
- Lightweight, low-profile radio altimeter compatiable with Ground Proximity Warning Systems (GPWS)
- Typically used with ALI-55/55A analog indicators or DRI-55 digital display indicator, and two 437X-1/1A/1B or ANT-50A/51A/52 antennas depending on aircraft configuration
- Provides decision height selection from 0 to 2500 feet
- Provides four shop-adjustable altitude trips (-001/011 unit)
- Capable of dual system configuration
- Built-in self-test effectively checks system excluding antennas
622-2855-002 - ALT-55B
622-2855-001 - 20 to 2500 ft. range with 4 trip shop adjustable trip outputs
622-2855-011 - Same as -001 but with reduced altitude error product improvement mentioned above
622-2855-002 - 20 to 2500 ft. range with 4 trip non-shop adjustable trip outputs
622-2855-012 - Same as -002 but with reduced altitude error product improvement mentioned above

