Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 10
1.3.1 Ground Proximity Warning
As shown in Figure 1.3.1-1, the EGPWS provides the basic Ground Proximity Warning System (GPWS) alerting in six
modes.
MODE 1
EXCESSIVE DESCENT RATE
" SINKRATE"
"PULL UP!"
MODE 2
EXCESSIVE TERRAIN
CLOSURE RATE
"TERRAIN..TERRAIN"
"PULL UP!"
MODE 5
EXCESSIVE DEVIATION
BELOW GLIDESLOPE
"GLIDESLOPE"
MODE 6
EXCESSIVE BANK ANGLE
"BANK ANGLE!"
ALTITUDE CALL-OUTS
"...FIVE HUNDRED..."
MODE 3
SINK AFTER TAKEOFF
"DON'T SINK!"
MODE 4
TOO CLOSE TO TERRAIN
"TOO LOW - TERRAIN"
"TOO LOW - GEAR"
"TOO LOW - FLAPS"
FIGURE 1.3.1-1: GROUND PROXIMITY WARNING MODES
Modes 1 through 5 are in accordance with the requirements of TSO-C92c, TSO-C151a, DO-161A, C117a, CAA Spec 14 and
ICAO Annex 6. Mode 6 provides additional protection in the form of a selectable menu of radio altitude callouts during
landing approach, and an optional alert for excessive bank angle. (It should be noted that the numbering of the modes is
derived from the history of the development of GPWS, and does not imply any special hierarchy).
The basic GPW modes are tailored for the application by selection of various options, which are configuration module
selectable during installation of the EGPWC. An overview of the functioning of each of the GPW modes is given in the
following paragraphs. Full details of the operation of the modes are given in section 6.2.
An audio declutter feature is standard which activates the voice alert once, then not again unless the situation has degraded by
20%. This feature applies to modes 1, 3, 4, and 5.