getting to grips with surveillance(127)

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CRISTAL ITP is a consortium with AIRBUS, Alticode, Eurocontrol, ISAVIA (Icelandic ANSP) and NATS (UK ANSP). The objective of CRISTAL ITP is to validate ITP. In March 2008, CRISTAL ITP performed a successful flight test with an SAS commercial flight and an AIRBUS test aircraft. During the flight test, the AIRBUS test aircraft performed different ITP maneuvers around the SAS aircraft. The flight test occurred in the Reykjavik airspace under radar coverage to ensure safe separations.
At the time of writing the brochure, CRISTAL ITP has proposed a PANS-ATM (ICAO Doc 4444) amendment to introduce ATSA ITP to be validated by ICAO.

APPENDIX D - ATSAW VISUAL SEPARATION ON APPROACH (VSA)
D.1. PROCEDURE
With the introduction of ATSAW in the VSA procedure, the distinction is made between three types of VSA procedure:
.  
The current VSA procedure without ATSAW

.  
The basic VSA procedure with ATSAW slightly modifies the flight crew procedure. The ATC controller does not distinguish aircraft equipped with ATSAW from aircraft not equipped with ATSAW. Therefore, the ATC controller procedure is not modified. The flight crew uses ATSAW to visually acquire the preceding aircraft and to maintain the visual separation.

.  
The advanced VSA procedure with ATSAW modifies the flight crew and ATC controller procedures. With a new phraseology, the flight crew informs the ATC controller that the preceding aircraft is identified with ATSAW but not yet visually acquired out the window. Consequently, the ATC controller is not required to update the traffic information until the visual contact by the flight crew.

ATSAW significantly improves the VSA procedure by providing the following parameters:
- 
The position and orientation of surrounding aircraft

- 
The flight identification of surrounding aircraft that can be correlated with ATC transmissions

- 
The ground speed of surrounding aircraft that help anticipating sudden deceleration of the preceding aircraft.

The following sections describe the VSA procedure as per the three types above.
The VSA procedure contains three steps:
1.
 The visual acquisition of the preceding aircraft

2.
The clearance for maintaining the visual separation with the preceding aircraft

3.
The maintenance of visual separation on approach with the preceding aircraft.

 

D.1.1. VISUAL ACQUISITION OF THE PRECEDING AIRCRAFT

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)

.. The ATC controller provides the flight crew with traffic information on the preceding aircraft.
.. The flight crew looks out the window to visually acquire the preceding aircraft.
　
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