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Honeywell
MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
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2.3.10.3 Inhibit Switch Functio ns and Selection
The Terrain Inhibit and Audio Inhibit functions are optional but it is recommended that one be used to
inhibit the system during certain operations. The operator should evaluate the two options together with
the Low Altitude Mode function and select the one that best fits his operational requirements. The Low
Altitude Mode is also described below for reference.
2.3.10.3.1 Terrain Inhibit
The Terrain Inhibit will inhibit Terrain and Obstacle audio alerts and warnings. It will not deselect the
Terrain Display. The switch is a toggle action, which must be pressed to turn ON and re-pressed to turn
OFF. The switch lighting must be activated thru the switch contacts. This Inhibit is recommended for
corporate transport operations.
2.3.10.3.2 Audio Inhibit (Timed)
The Timed Audio Inhibit will inhibit all audio output for a period of 5 minutes. It will not affect visual alert
and warning outputs and will not deselect the terrain display. The switch is momentary and the lamp is
illuminated by an output from the EGPWS. This inhibit is recommended for EMS and SAR operations.
2.3.10.3.3 Audio Inhibit (Not Described Above)
The Audio Inhibit will inhibit all audio output as long as it is active. It will not affect visual alert and warning
outputs and will not deselect the terrain display. The switch is a toggle action, which must be pressed to
turn ON and re-pressed to turn OFF. The switch lighting must be activated thru the switch contacts. This
Inhibit is NOT RECOMMENTED.
2.3.10.3.4 Low Altitude Mode
To allow for helicopter operations that require low altitude flight a Low Altitude function is enabled with a
switch. This function is designed for flight at low altitude in VFR conditions. When this function is engaged
Mode 2 and Mode 4 warning boundaries are significantly reduced and Terrain Advisory look ahead
distances are reduced. . Low Altitude operation is defined as operation below 500 feet AGL. There are
other circumstances where the use of the Low Altitude Mode is appropriate. Those include operation in a
high-density metropolitan environment with high rise buildings, operation below 1250 feet AGL when the
GPS is not operational or is providing poor accuracy.