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the display range of the ND, the TCAS RA traffic symbol and its accompanying
data tag are displayed on the ND.
The TCAS RA traffic symbol is a filled red square. The RA data tag contains the
altitude and the vertical motion arrow.
• resolution advisory (RA)
and display
• traffic advisory (TA) and
display
• proximate traffic display
• other traffic display
April 01, 2001
747 Operations Manual
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.20.9
For no–bearing RAs, the red RA label is displayed below the red message,
TRAFFIC, and the RA data tag information is displayed to the right of the label.
The RA data tag contains the distance, altitude, and the vertical motion arrow.
When the RA is further from the airplane than the ND range currently displayed,
the TCAS red message OFFSCALE is displayed on the ND.
Traffic Advisories (TA) and Display
A TA is a prediction another aircraft will enter the conflict airspace in 25 to 45
seconds. TAs assist the flight crew in establishing visual contact with the other
aircraft.
When TCAS predicts a TA:
• the TCAS voice annunciation TRAFFIC, TRAFFIC sounds once
• the TCAS amber message TRAFFIC is displayed on the ND.
When the TCAS cyan message TFC is displayed on the ND and the TA is within
the display range of the ND, the TCAS TA traffic symbol and its accompanying
data tag are displayed on the ND.
The TA traffic symbol is a filled amber circle. The TA data tag contains the
altitude and vertical motion arrow.
For no–bearing TAs, the amber TA label is displayed below the TRAFFIC
message, and the TA data tag information is displayed to the right of the label. The
TA labels are displayed below the RA labels. The TA data tag contains the
distance, altitude, and vertical motion arrow.
When the TA is further from the airplane than the ND range currently displayed,
the TCAS amber message OFFSCALE is displayed on the ND.
Proximate Traffic Display
Proximate traffic is another aircraft that is neither an RA or a TA but is within:
• six miles
• 1,200 feet vertically
When the TCAS cyan message TFC is displayed on the ND, and the proximate
traffic is within the ND display range, the TCAS proximate traffic symbol is
displayed on the ND.
The TCAS proximate traffic symbol is a filled white diamond. If the other aircraft
is providing altitude data, the proximate traffic data tag is displayed on the ND.
The proximate traffic data tag contains the altitude and vertical motion arrow.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
15.20.10 D6-30151-425
Warning Systems -
System Description
Other Traffic Display
Other traffic is another aircraft that is within the ND display limits but is neither
an RA, a TA, or proximate traffic. If the other aircraft is not providing altitude
information, other traffic becomes proximate traffic automatically when within
six miles.
When the TCAS cyan message TFC is displayed on the ND and the other traffic
is within the ND display range, then the TCAS other traffic symbol is displayed
on the ND.
The TCAS other traffic symbol is a hollow white diamond. If the other aircraft is
providing altitude data, a data tag like that described in the proximate traffic
display is displayed.
TCAS PFD Vertical Guidance
When TCAS predicts an RA, TCAS PFD vertical guidance is displayed for a
traffic avoidance maneuver to ensure vertical separation. Traffic avoidance is
ensured by adjusting or maintaining a pitch attitude outside the red outlined RA
pitch region.
If the traffic aircraft also has TCAS and a mode S transponder, TCAS vertical
guidance is coordinated with the traffic aircraft TCAS.
TCAS ND Messages
ND Message Color Description
TFC Cyan TCAS traffic display enabled.
Inhibited if following TCAS messages are displayed:
TCAS FAIL,
TCAS OFF,
TCAS TEST
TRAFFIC Amber TA is occurring.
OFFSCALE Amber TA is occurring at range greater than current ND range.
Replaced by red OFFSCALE when RA is also
occurring at range greater than current ND range.
TRAFFIC Red RA is occurring.
OFFSCALE Red RA is occurring at range greater than current ND range.
TA ONLY Cyan TCAS can not provide RAs. All traffic that would have
been RAs are predicted as TAs.
April 01, 2001
747 Operations Manual
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.20.11
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