Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 9
The functional areas are:
• Basic Ground Proximity Warning
• Altitude Awareness Callouts
• Excessive Bank Angle Alert
• Enhanced features, Terrain and Obstacle Awareness alerts and warnings as well as optional display
of this information, “Peaks” mode, and Terrain Clearance Floor.
• WS Detection and Alerting (limited application).
The basic Ground Proximity Warning (GPW) function is the backbone of the system, and the primary design objective has
been to maintain the integrity of this function independent of the other functions. For example, loss of the Terrain Awareness
display function will not affect the operation of the GPW functions (provided that the input signals necessary for GPW
operation are still available).
In addition to the main alerting functions, the computer also performs the following auxiliary functions:
• Input signal processing (including filtering and signal monitoring).
• Alert output processing (including alert prioritization, voice message synthesis, audio output and display
and caution or warning lamp drivers)
• Built In Test and monitoring including cockpit-activated self test.
• PCMCIA interface for uploading software and databases (using a Smart Cable).
• Front panel maintenance test connector for system checkout and troubleshooting.
• System status LED’s located on the LRU front panel to indicate external fault, computer O.K. and computer
fail conditions.