Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 80
Other maximum enabling, and reset, altitudes are used at certain airports to increase alerting range. The landing gear logic is
also overridden at these airports (see Envelope Modulation section 6.8).
6.4.2 Altitude Callouts
Altitude callout messages are enabled based on the menu set selected. Altitude callouts are only activated between the
associated value, and a value 10 feet less than this value (20 feet when above 150 feet). In the event that the callout is not
issued in this band, the computer performs as though the callout was given. Only one callout message is active at a time and
subsequent callout messages can not be started until the current message completes. In this manner, an effective callout
priority is established.
A memory function is utilized to lock out callouts once they have been issued or their associated altitude bands have been
transitioned until such time as the altitude becomes greater than 1000 feet in approach mode or the approach mode to takeoff
mode transition has occurred.
In the event of program “RESET” (e.g., power interrupts) during the approach phase of flight, the current value of altitude is
used to initialize the callout logic such that those callouts above this altitude are treated as though they have already been
issued.
To inhibit an altitude callout from occurring at minimums the following lockouts are provided
Callouts 200 feet and above are inhibited if within 30 feet of the minimums setting.
Callouts below 200 feet are inhibited if within +6/-3 feet of the minimums setting.
This lock out is only active as long as the minimums setting and the callout correspond. Therefore, continuous monitoring of
this setting is performed.
6.4.3 Smart Altitude Callouts
When enabled the smart callout feature provides for a “500” foot callout that is only active during a non-precision approach.
The smart callout feature can function with (or without) any of the normal altitude callouts. If the smart 500 callout is enabled
it will be given during an approach if any one or more of the following conditions are true:
1) If the flight path is not within ±2 dots of a valid glideslope beam, or not within ±2 dots of valid localizer if a
localizer input is configured.
2) If a backcourse approach is detected.
3) If Glideslope Canel is selected.
The smart callout feature is activated through a configuration module configuration item. In addition altitude callouts must be
enabled for the smart callout to function.
6.4.4 Excessive Bank Angle Callout
The bank angle feature provides protection for over banking during maneuvering on approach or climb-out and while at
altitude. In addition, it protects against wing or engine strikes close to the runway.
An aural callout consisting of a “Bank Angle, Bank Angle” is given. Follow-on aural messages are only allowed when the
aircraft roll angle increases an additional 20% from the previous alert. The bank angle option is enabled through a
configuration module configuration item.
The bank angle callout is based on the aircraft’s roll angle versus altitude (AGL). Warnings for the MKVI/MKVIII EGPWS
are shown in Figure 6.4.4-1 where the roll angle limit varies linearly from 15 degrees at 10 feet AGL, to 50 degrees at 210
feet AGL. A unique bank angle curve is available on the MKVIII EGPWS to be used on turbofan aircraft. The curve is
shown in Figure 6.4.4-1A where roll angle limit varies linearly from 10 degrees at 30 feet AGL to 40 degrees at 150 feet
AGL.
For airplanes fitted with an autopilot additional protection is provided if the autopilot is engaged. For aircraft configured for
the turboprop curve, callouts are also shown in Figure 6.4.4-1 where the roll angle limit varies linearly from 15 degrees at 10
feet AGL, to 33 degrees at 156 feet AGL. For aircraft configured for the bizjet curve, callouts are also shown in Figure 6.4.4-
1A where the roll angle limit varies linearly from 10 degrees at 30 feet AGL, to 33 degrees at 122 feet AGL
Note: Autopilot protection was added in –008. Do not connect an Autopilot Engaged discrete input to dash numbers prior
to –008.