Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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5.3 Configuration Selection Tables
Configuration selection is defined by category (or group of functions or inputs). The Category number identifies the
subsection where the details are defined. For example Air Data, Category 2, is defined in Section 5.3.2, and Position
Input Source, Category 3, is defined in Section 5.3.3.
5.3.1 Category 1, Aircraft / Mode Type Select
In this category the following parameters are defined:
• Basic mode alert thresholds
• Selected Mode 4B threshold
• Selected airspeed expansion
• Landing gear type
• Aircraft category (GA Fast, GA Slow, or Bizjet) defines the expected aircraft models, which the Aircraft Type will be
allocated to. It should be noted that the term “GA” when referring to GA Fast and GA Slow refers to Turboprop
aircraft and slower jet aircraft. Some of the differences between aircraft types are listed below to assist the reader.
Bizjet (Turbofan, MK VIII EGPWS only):
• Uses Commercial GPWS modes with Bizjet optimized “Bank-Angle” callout.
• A Gear stuck down fault will be indicated if the Gear are down and Airspeed exceeds 290 knots
• A Flap stuck down fault will be indicated if the Flaps are down and Airspeed exceeds 250 knots
• Uses either a 2000 ft and greater runway database (default) or a 3500 ft and greater runway database
GA Fast (Fast Turboprop):
• Uses classic MK VI GPWS modes.
• A Gear stuck down fault will be indicated if the Gear are down and Airspeed exceeds 290 knots
• A Flap stuck down fault will be indicated if the Flaps are down and Airspeed exceeds 250 knots
GA Slow (Slow Turboprop):
• Uses classic MK VI GPWS modes.
• Allows use of Mode 4 Alternate Airspeed Expansion
• A Gear stuck down fault will be indicated if the Gear are down and Airspeed exceeds 200 knots
• A Flap stuck down fault will be indicated if the Flaps are down and Airspeed exceeds 180 knots
The gear stuck and flap stuck faults activate the “GPWS INOP” and are recorded in fault history.
In addition, the Mode 4 Altitude and Airspeed Expansion variables are defined as follows:
• Mode 4B Altitude are described as follows:
150’ Mode 4B: The voice “Too Low Flaps” is intitiated at 150 feet above the ground.
170’ Mode 4B: The voice “Too Low Flaps” is intitiated at 170 feet above the ground.
200’ Mode 4B: The voice “Too Low Flaps” is intitiated at 200 feet above the ground.
• Normal/Alternate Airspeed Expansion are described as follows:
Normal Airspeed Expansion:
• Above 178 knots, penetration of the Mode 4 envelope will cause a “Too Low Terrain” voice
• Below 178 knots, penetration of the Mode 4 envelope will cause a “Too Low Gear” voice
Alternate Airspeed Expansion:
• Above 148 knots, penetration of the Mode 4 envelope will cause a “Too Low Terrain” voice
• Below 148 knots, penetration of the Mode 4 envelope will cause a “Too Low Gear” voice