EHSI TCAS Messages
TCAS Mode Display
TFC (green) – TFC selected on EFIS control panel in the MAP, VOR, or ILS
mode.
TCAS TEST (white) – TCAS in test mode.
TCAS FAIL (amber) – TCAS failed.
TA ONLY (green) – TCAS TA ONLY mode is selected (displayed in all EHSI
modes whether TFC is selected or not).
TCAS OFF (white) – TCAS is selected OFF (displayed in MAP, VOR, and ILS
modes.
OFFSCALE
Displayed (amber) – TA traffic beyond EHSI display range. Displayed (red) – RA traffic beyond EHSI display range.
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737 Operations Manual
TRAFFIC Displayed (amber) – TA condition exists Displayed (red) – RA condition exists.
No Bearing Messages
Displayed (red or amber) – No bearing information available for traffic (see EHSI symbology chart for display).
EHSI System Failure Flags and Annunciations
NOTE: All flags are yellow
As installed
Track (TRK) or Heading (HDG) Flag
Track or heading data has failed.
Flight Instruments, Displays -Electronic Flight Instrument System 737 Operations Manual
VOR Flag
Indicates failure of a VOR display on the EHSI (displayed here if the MAP or CTR MAP mode is selected and the VOR/ADF switch is on.
EXCESS DATA Annunciation
.
refresh rate of MAP display has dropped below limit
.
display may flicker at lower refresh rates.
WXR Annunciations (left justified, two lines)
.
WXR FAIL – indicates weather radar has failed (no weather data
displayed
.
WXR WEAK – indicates weather radar calibration fault
.
WXR ATT – indicates loss of attitude stabilization for antenna
.
WXR STAB – indicates antenna stabilization is off
.
WXR DSPY – indicates loss of display unit cooling or an overheat
condition of the EHSI. Weather radar display is blanked.
Crosstrack (XTK) Deviation Flag
Indicates failure of the FMC crosstrack deviation data (displayed here if the FULL NAV mode is selected).
VOR, LOC Flag
Indicates failure of the EHSI VOR or LOC display (displayed here if the FULL VOR/ILS mode is selected).
MAP Flag
Indicates failure of associated FMC generated map display (displayed here if CTR MAP mode is selected).
MAP Flag
Displayed here if MAP mode is selected.
Vertical Track (VTK) Flag (typical location)
Indicates failure of the FMC vertical track data.
Crosstrack (XTK) Deviation Flag
Displayed here if the EXP NAV mode is selected.
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VOR, LOC Flag
Displayed here if the EXP VOR/ILS mode is selected.
NAV Advisory Message
UNABLE REQD NAV PERF–RNP – Indicates that FMC ANP is not sufficient for the current special RNP (displayed here if MAP or CTR MAP is selected).
Source Select Annunciation
Displayed on the off side EHSI to indicate that the FMC source select switch is not in the NORMAL position. Displayed here if MAP or CTR MAP mode is selected.
Look-Ahead Terrain Messages (EGPWS)
Terrain Status Annunciation (amber)
TERR FAIL – Look-ahead terrain alerting and display have failed.
Flight Instruments, Displays -Electronic Flight Instrument System 737 Operations Manual
TERR POS – Look-ahead terrain alerting and display unavailable due to position uncertainty.
TERR INHIBIT – GPWS terrain inhibit switch in TERR INHIBIT position.
Terrain Range Status Annunciation (amber)
TERR RANGE DISAGREE –
.
terrain display enabled, and
.
terrain output range disagrees with selected EFIS control panel range.
MAP/TERR RANGE DISAGREE –
.
terrain display enabled, and
.
terrain output range disagrees with selected EFIS control panel range, and
.
map display output range disagrees with selected EFIS control panel
range.
Terrain Mode Annunciation (cyan)
TERR TEST – GPWS is operating in self-test mode.
TERR – Terrain display enabled (manual or automatic display).
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