Accession Number:

AD0747656

Title:

Dulles Category IIIA ILS Evaluation

Descriptive Note:

Technical rept.

Corporate Author:

AIR FORCE INSTRUMENT FLIGHT CENTER RANDOLPH AFB TX

Personal Author(s):

Report Date:

1972-05-01

Pagination or Media Count:

19.0

Abstract:

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.

Subject Categories:

  • Air Navigation and Guidance

Distribution Statement:

APPROVED FOR PUBLIC RELEASE