Honeywell MK VI - Manual (Page 55)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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3.3.4 Mode 3 typ e
Two Mode 3 alert curves are defined, GA (Turboprop) and Bizjet (Turbofan). The GA (Turboprop) Mode 3 curve
is equivalent to the (classic) MK VI Mode 3 curve. The Bizjet (Turbofan) Mode 3 curve is equivalent to the MK V
and MK VII EGPWS Mode 3 curves.
3.3.5 Mode 4 typ e
Mode 4A (Too Low Gear) expanded alert transition occurs at 178 knots for GA Fast aircraft, 148 knots for GA
Slow aircraft, and 190 knots for Bizjet aircraft. Mode 4B (Too Low Flaps) upper boundary has four defined
levels, 245 ft, 200 ft, 170 ft, and 150 ft. The 245 ft boundary is added to emulate the MK V, VII Mode 4B
boundary. The 200 ft boundary is added to emulate the MK II Mode 4B boundary. The 150 ft boundary
(Alternate Mode 4B) is for those aircraft types that routinely delay full flap deployment. All other aircraft types
would use the 170 ft boundary (Normal Mode 4B). For aircraft with previously installed (classic) MK VI GPWS,
the Normal / Alternate Mode 4B correspond to the “Alternate Mode 4B” program pin (J1-25).
The following table compares Mode 4 boundaries for each
Boundaries Mode 4
Aircraft type /
Alternate Mode 4B
Mode 4A Gear Down
at 500 ft, < X knots
Mode 4B Flaps Down
feet / < X knots
Mode 4 A/B
Maximum
A/B
Type
GA Fast, Normal Mode 4B 178 knots 170 ft / 150 knots 750 ft 6
GA Fast, Alternate Mode 4B 178 knots 150 ft / 148 knots 750 ft 8
GA Slow, Normal Mode 4B 148 knots 170 ft / 120 knots 1 750 ft 7
GA Slow, Alternate Mode 4B 148 knots 150 ft / 118 knots 1 750 ft 9
GA Fast, MK II emulation 178 knots 200 ft / 148 knots 1000 ft 5
Bizjet, MK V, VII emulation 190 knots 245 ft / 159 knots 1000 ft 1
NOTE 1: Some installations that have chosen the GA SLOW aircraft type have found during flight test that the
aircraft can not (or does not) slow to less than 120 knots on normal approach. Thus the installation is
prone to nuisance TOO LOW TERRAIN alerts. These installations should choose the GA FAST
aircraft type.
3.3.6 Bank Angle Type
Two Bank Angle callout curves are defined, GA (Turboprop) and Bizjet (Turbofan). Both Bank Angle callout
curves have an Autopilot Engaged warning area. The Bizjet (Turbofan) Bank Angle callout curve is equivalent to
the MK V and MK VII EGPWS Bank Angle callout curves when the autopilot is not engaged.
Aircraft Type Lower Cutoff Lower Boundary Upper Boundary Slope
GA (Turboprop) 10 ft 10 ft / 15° 210 ft / 50° 2450 ft / 50°
Bizjet (Turbofan) 5 ft 30 ft / 10° 150 ft / 40° 2450 ft / 55°