The documents of "International seminar on reduction of
aviation incidents at approach and landing" (ALAR
Manual) (Moscow, July 29-30, 2003) reveal that a
considerable amount of civil aviation incidents and
accidents take place at above mentioned flight phases.
At that an approach without PAR monitoring is five times
more dangerous than using it. This fact emphasizes an
urgent need of ground-based approach monitoring
improvement.
Taking into account an actual lack of Precision Approach
Radars (PAR) at civil airports and limited capabilities
of the existing terminal PSRs for approach monitoring
(monitoring of lateral deviations only due to PSR's
capabilities), VNIIRA-OVD JSC has developed and applied
in Tower controller CWPs of the Unified Series of SINTEZ
Automated Systems an appropriate software for approach
monitoring using data from Terminal Surveillance Radar
Complex, combining PSR, MSSR (or SSR), APOI and data
link.
The screenshot of SINTEZ-ARM-A Tower/Final approach
controller ASD representing the information for approach
monitoring using terminal SSR data is given in Figure 1.
Providing ATC controllers with the above-mentioned
information makes possible visual and automated approach
monitoring and allows to detect aircrew CFIT-related
errors when Precision Approach Radar is not available.
A great advantage of the suggested solution (in
comparison with ICAO minimum recomendations) is the
possibility of efficient integrate estimation of
approach safety by monitoring of flight path conformance
with nominal glide path and runway centerline extension,
due to aircraft's real
approach path displayed graphically. In April 2002 the validation tests of
automated approach monitoring function were carried out
at Pulkovo airport and was recommended to be implemented
in the Tower/Final approach controller CWPs of the
Unified Series of SINTEZ automated ATC systems and
facilities.
It is noted in the "Controller's estimation…" that the
automated function of the approach monitoring
implemented in Tower/Final approach controller working
positions and SINTEZ-ARM-A CWPs provides an approach
monitoring in accordance with the existing technology
and gives a controller an additional opportunity of
preventing aircraft dangerous descent under a nominal
glideslope and great lateral deviations from a runway
centerline extension. This allows to increase the
aircraft approach safety, especially under the
complicated flight conditions (adverse weather, aircraft
functional systems failures, etc.). Any SSR can be
used to perform the monitoring function.
Figure 1. Information for approach safety monitoring
displayed on a Tower controller's WP ASD.
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