Dulles Category IIIA ILS Evaluation
AIR FORCE INSTRUMENT FLIGHT CENTER RANDOLPH AFB TX
Pagination or Media Count:
The Category IIIA ILS guidance system is designed to provide a VHF UHF localizer and glide slope with increased performance and a backup capability. The overall flyability of the systems must be superior to a Category I or II system due to the lower minimums 700 feet RVR authorized for the approach. Since the radiated signal is in the UHFVHF frequency band, it is subject to the same errors and limitations caused by ground or airborne vehicles. The success, then, of a Category IIIA approach depends on the control of interference factors and capability of the aircraft and pilot to maintain the localizer and glide path.
- Air Navigation and Guidance