Concept of Operations for the Use of
Synthetic Vision System (SVS) Display
During Precision Instrument Approach
April 2007
David A. Domino, The MITRE Corporation
ABSTRACT
This paper describes a concept of operations for the use of Synthetic Vision System
(SVS) display technology with Category (CAT) I, straight in instrument landing system
(ILS) approach. A concept is proposed which extends the current authorization available
under Code of Federal Regulations (CFR) Part 91.175 of the Federal Air Regulations (FAR)
to begin descent from the published Decision Altitude (DA), based on visual sighting of
approach lights. It is proposed that an extended runway centerline feature displayed on an
SVS could be substituted for visual contact with the approach lights, as authorized in
91.175, as long as this information is cross checked with the ILS signal. It requires the use
of ILS signals for navigation down to 100 ft height above altitude (HAT), which is available
for many ILS installations. Descent below 100 ft HAT would not be allowed unless other
visual cues associated with the runway environment are clearly visible and identifiable by the
pilot.
Issues and areas for future research to support this concept of operations are presented.
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Additional Search Keywords
Synthetic Vision System, low visibility approach, Category I ILS, Category II
ILS, weather minima, CFR Part 91.175
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