Page 17-16
Section III Sub-section 17
AVIONICS
P/N 140-590032-0007
Revision A4: Sep, 2010
Pilot’s Operating Manual
The EGPWS Terrain video is inhibited by pushing the TERR INHIB switch. If the EGPWS terrain video
is showing, pushing the TERR INHIB switch makes the video stop and TERR is shown in amber.
NOTE: The basic EGPWS modes 1-6 and windshear mode 7 remain active when the Terrain
Awareness Alerting is manually inhibited.
Peaks and obstacles are two supplemental features of TAD. Peaks provides additional terrain display
features for enhanced situational awareness, independent of the airplane’s altitude. This includes digital
elevations for the highest and lowest displayed terrain and additional elevation (color) bands.
The obstacles feature utilizes an obstacle database for obstacle conflict alerting and display. EGPWS
caution and warning visual and audio alerts are provided when a conflict is detected. Also, when TAD
is enabled, obstacles are graphically displayed similar to terrain.
A Runway Field Clearance Floor (RFCF) feature is also included. This is similar to the TCF feature
except that RFCF is based on the current airplane position and height above the destination runway
using Geometric Altitude (in lieu of Radio Altitude) and provides improved protection at locations where
the surrounding terrain is significantly lower than the runway. Reference Figure 8 for a depiction of the
Runway Field Clearance Floor Envelope.
Geometric Altitude is a computed pseudo-barometric altitude, based on the GPS altitude, which is
designed to reduce or eliminate altitude errors resulting from temperature extremes, non-standard
pressure altitude conditions and altimeter miss-sets.
Self Test
The EGPWS performs a self test each time power is applied to the computer and when manually
selected. Any failures during the self test are annunciated to the pilots both visually and aurally.
Switches/Annunciators
Annunciators and switches (external to the EGPWS) control and annunciate the status of the various
modes of the EGPWS. There are four switches/annunciators located on the Center Instrument Panel
between the pilot’s and copilot’s MFD. Refer to Figure 2. Located in the overhead control panel is the
EGPWS TEST pushbutton. Refer to Figure 1.
The functions of the various switches/annunciators are as follows:
1. EGPWS TEST — Not a light. Momentary push button to initiate system self-test.
2. FLAP OVRD — Background illuminates white when flap warnings disabled. Alternate action button
to override or restore mode 2 and mode 4 flap warnings.
3. GS INHIB — Background illuminates white when glideslope is inhibited. Momentary push switch
to inhibit or restore glideslope mode 5 warning.
4. TERR INHIB — Background illuminates white when terrain display is inhibited. Pressing the TERR
INHIB switch inhibits TAD and TCF alerting and display, including Obstacles and Peaks when
enabled. This is used when position accuracy is inadequate or when operating at airports not in
the database. Neither loss nor inhibiting TAD/TCF effects the basic GPWS functions (modes 1-7).
5. ALT CALLS INHIB — Background illuminates white when altitude call outs inhibited. Momentary
push switch to inhibit mode 6 altitude callouts.
Содержание Hawker 800XP
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