RELEVANT DISCUSSION: AIM 1-1-17 THROUGH 1-1-20, 1-2-1 THROUGH 1-2-3, 5-1-16, 5-3-4, 5-4-5 THROUGH 5-4-7, P/C GLOSSARY, OPSPEC C052, FAA-H-8083-16, AC 20-138, AC 90-97, AC 90-100, AC 90-101, AC 90-105, AC 90-107, AC 90-108, TSO-C161, TSO-C162, TSO-C196, FAA ORDER 8260.19
1. GBAS (Ground Based Augmentation System), aka GLS (GBAS Landing System), aka LAAS (Local Area Augmentation System). GBAS augments GPS and provides corrections to aircraft to improve GPS navigation for approaches. It is considered a precision approach. LAAS is synonymous with GBAS. LAAS was the term initially used by the FAA, which has since migrated to the ICAO term GBAS. GLS is the FAA’s official term for a GBAS approach (e.g., GLS RWY 23). GBAS and WAAS standards are different, so GBAS datalinks must be supported by compatible avionics in the…
