Boeing 787-8 - Resolution Advisories (RA) and Display; Traffic Advisories (TA) and Display

787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
15.20.16 D615Z003-TBC
TCAS identifies a three–dimensional airspace around the airplane where a high
likelihood of traffic conflict exists. The dimensions of this airspace are contingent
upon the closure rate with conflicting traffic.
TCAS provides:
TCAS messages and TCAS traffic symbols can be displayed on the ND and
mini-map. TCAS messages and TCAS traffic symbols cannot be displayed on the
ND in plan mode.
TCAS messages TRAFFIC, TA ONLY, and TCAS TEST may be displayed in all
ND modes.
Resolution Advisories (RA) and Display
An RA is a prediction that another airplane will enter the TCAS conflict airspace
within approximately 15 to 35 seconds. If altitude data from the other airplane is
not available, no RA can be provided.
When TCAS predicts an RA:
• the TCAS red message TRAFFIC is displayed on the ND
• a TCAS voice annunciation sounds
• TCAS PFD vertical guidance is displayed
When the TCAS cyan message TFC is displayed on the ND, and the RA is within
the display range of the ND, the TCAS RA Traffic symbol and its accompanying
data tag is 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.
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 red 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 that another airplane will enter the conflict airspace in 20 to
48 seconds. TAs assist the flight crew in establishing visual contact with the other
airplane.
When TCAS predicts a TA:
• the TCAS amber message TRAFFIC is displayed on the ND
• the TCAS voice annunciation TRAFFIC, TRAFFIC sounds once
• resolution advisory (RA)
and display
• traffic advisory (TA) and display
• proximate traffic display
• other traffic display
February 15, 2010