ATC
ICAO set to issue revised WAAS approach criteria
The International Civil Aviation Organization (ICAO) announced it will issue revised standards for helicopter navigation this fall that are intended to tak

The International Civil Aviation Organization (ICAO) announced it will issue revised standards for helicopter navigation this fall that are intended to take advantage of GPS receiver technology and new types of instrument approach procedures.

The first set of standards will deal with vertical and lateral guidance using the wide area augmentation system (WAAS) or its European equivalent, the European geostationary navigation overlay system (EGNOS)–both based on GPS augmentation. Another standard will cover simultaneous, parallel, non-interfering approaches at airports. Still in the rulemaking phase are point-in-space (PIS) approach standards and performance-based navigation for helicopters.