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.. The flight crew looks at the ND with the traffic display enabled (refer to
3.6.5.1.1 – TRAF ON/OFF) to detect the preceding aircraft.
o Visual contact
- The flight crew checks the consistency between the visual contact, the ATSAW traffic information, and the ATC traffic information.
- The flight crew informs the  - The flight crew informs the 
ATC controller that the  ATC controller that the 
preceding aircraft is in sight  preceding aircraft with its 
(i.e. TRAFFIC IN SIGHT). Go  flight number displayed on ND 
to the next step.  is in sight (e.g. TRAFFIC AIB1234 IN SIGHT1). 
- The ATC controller checks the 
consistency between the flight 
number of the preceding 
aircraft provided by the flight 
crew and the one on the 
surveillance display. 
9 If the flight numbers are 
consistent, go to the next 
step. 
9 If the flight numbers are 
not consistent, the ATC 
controller informs the flight 
crew that the flight number 
is not correct and provides 
the traffic information 
again. 

1 It means that the traffic is identified on ND thanks to ATSAW but the visual contact is not established. At the time of writing the brochure, this new phraseology was not yet validated. ICAO recommendations on this new phraseology will be published in the ICAO PANS-ATM, Doc 4444 (see References).

Current VSA procedure
Basic VSA procedure

Advanced VSA procedure
(Green italic is specific to the basic (Blue italic is specific to the enhanced
procedure) procedure)
(Amber italic is specific to the basic and advanced procedure)
o No visual contact
- The flight crew reports to the
- If the preceding aircraft is on
ATC controller that they
ND, the flight crew
continue to search the
9 Informs the ATC controller
preceding aircraft (i.e.
that the preceding aircraft
LOOKING OUT)
is identified on ND (e.g.
- The flight crew asks the ATC
LOOKING OUT AIB12342)
controller for traffic
9 Continues to search the
information updates if the
preceding aircraft with the
visual contact is not quickly
support of the ATSAW
achieved
traffic information.
- When the preceding is finally
- The ATC controller checks the
in sight, the flight crew checks consistency between the flight
the consistency between the number of the preceding
visual contact, the ATSAW aircraft provided by the flight
traffic information, and the crew and the one on the
ATC traffic information.
surveillance display:
9 If the flight numbers are consistent, the ATC controller waits the flight crew reports the traffic in sight.
　
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本文鏈接地址：getting to grips with surveillance(128)