IN-SERVICE IMPROVEMENTS TO RELIABILITY AND MAINTAINABILITY OF THE INSTRUMENT LANDING SYSTEM

This report documents results of task efforts undertaken by Ohio University between October 1977 and May 1979. Engineering data resulting from a study of the sideband reference, glide-slope system baseline operating parameters and the effects of specific faults are presented. A series of perturbational studies conducted at commissioned sideband reference facilities and numerous field experiments at Ohio University's Tamiami, Florida site facility are described. Suggested technical improvements and text changes for existing technical manuals have also resulted. The effects of a wide range of terrain profiles on the performance of sideband reference, null reference, and capture effect systems are compiled in album form. Sideband reference system setup procedures are reviewed, the electrical and physical requirements for the counterpoise are explored, and an introductory look at threshold-plane DDM profiles is presented. ILS anomaly investigations have resulted in the design, testing, and implementation of a modification to the Type FA-5723 clearance transmitter. Also, predictions of complete glide-slope performance for a proposed site on Runway 22L at Boston Logan are presented. The maximum allowable VSWR for the 15-element V-Ring and the O-Ring localizers are investigated based on theoretical and experimental work. The findings are that the maximum VSWR is not that of a simple specification but rather that of values that are within the bounds of worst and best-case conditions depending on the value of the complex reflection coefficient. (Author)

  • Corporate Authors:

    Ohio University, Athens

    3 Canterbury Drive
    Athens, OH  USA  45701

    Federal Aviation Administration

    800 Independence Avenue, SW
    Washington, DC  USA  20591
  • Publication Date: 1979-5

Media Info

  • Pagination: 487 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00304789
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EER-40-1, FAA-R-6750.2
  • Contract Numbers: DOT-FA78WA-4062
  • Files: NTIS, USDOT
  • Created Date: Jan 15 2002 12:00AM