Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D
SHEET
104
RELATIVE
PRIORITY
WARNING
CONDITION
POSSIBLE
MESSAGES
LAMP
FORMAT 1
LAMP
FORMAT 2
HIGHEST Mode 7 W/S Warning W/S W/S W/S W/S WARN W/S WARN
Mode 1 Pull Up Pull Up GP WARN GP WARN
Mode 2 Pull Up Preface Terrain Terrain GP WARN GP CAUTION
Mode 2 Pull Up Pull Up GP WARN GP WARN
Terrain Awareness Preface Terrain Terrain
Terrain Ahead
GP WARN
GP WARN
GP CAUTION
GP CAUTION
Terrain Awareness Warning Pull Up GP WARN GP WARN
Obstacle Awareness Preface Obstacle Obstacle
Obstacle Ahead
GP WARN
GP WARN
GP CAUTION
GP CAUTION
Obstacle Awareness Warning Pull Up GP WARN GP WARN
Mode 2 Terrain Terrain GP WARN GP CAUTION
Mode 6 Minimums Per selected menu No Lamp No Lamp
Terrain Awareness Caution Caution Terrain-Caution Terrain
Terrain Ahead-Terrain Ahead
GP WARN
GP WARN
GP CAUTION
GP CAUTION
Obstacle Awareness Caution Caution Obstacle-Caution Obstacle
Obstacle Ahead-Obstacle Ahead
GP WARN
GP WARN
GP CAUTION
GP CAUTION
Mode 4 Too Low Terrain Too Low Terrain GP WARN GP CAUTION
TCF Too Low Terrain Too Low Terrain GP WARN GP CAUTION
Mode 6 Altitude Callouts Per selected menu No Lamp No Lamp
Mode 6 Smart Callout Five Hundred No Lamp No Lamp
Mode 4 Too Low Gear Too Low Gear (Note 1) GP WARN GP CAUTION
Mode 4 Too Low Flaps Too Low Flaps GP WARN GP CAUTION
Mode 1 Sinkrate Sinkrate-Sinkrate GP WARN GP CAUTION
Mode 3 Don’t Sink Don’t Sink-Don’t Sink GP WARN GP CAUTION
Mode 5 Glideslope Glideslope G/S CAUTION G/S CAUTION
Mode 6 Bank Angle Bank Angle No Lamp No Lamp
LOWEST Mode 7 W/S Caution No Audio, or Caution Windshear W/S CAUTION W/S CAUTION
Note 1: For fixed gear aircraft this warning condition provides a “Too Low Flaps” message.
TABLE 6.9-1: WARNING/CAUTION MESSAGES
The EGPWS also has vocabulary for annunciating EGPWS status, current faults, fault history, and self-test operation.
6.9.3 Discrete Outputs
Outputs from the various alert computations are first processed to determine which lamp outputs to produce.
All of the lamp outputs are driven by solid state switches to ground. These outputs can also be used as discrete drivers for
other devices.
All caution/warning lamp outputs are normally a steady state switch to ground. The lamps can be individually programmed to
flash as a function of aircraft type only. The flashing outputa operats at a nominal 70 cycles per minute at a 50% duty cycle.
6.9.3.1 Ground Proximity Caution Discrete (Lamp) Outputs
Two lamp formats are defined as a function of the selected I/O discrete type. For lamp format type 1, only the Mode 5
“Glideslope” message will activate the caution lamp output (amber). All other messages, including Terrain Awareness, will
activate the warning lamp output (red). Note that Mode 6 does not activate any lamp outputs, only voices.
With lamp format 2, only the messages containing the phrase “Pull Up” will activate the warning lamp output (red). All other
messages will activate the caution lamp output (amber).
The glideslope cancel discrete controls the output of the Mode 5 “Glideslope” message. If the glideslope cancel discrete is
activated then the caution lamp (amber) and the voice ennunciation will be inhibited for the Mode 5 “Glideslope” message.