The subject effort was to test and evaluate the results of a new method of producing the red/white color-coded signal used in a Visual Approach Slope Indicator (VASI) system. The present system uses a split lens assembly to produce the color coding, which consists of a clear lens segment and a red lens segment, the clear being somewhat smaller than the red, to construct one single VASI lens assembly. A new method of providing the signal was developed by coating the upper part of a circular clear lens with a heat-resistant red-silicone-pigment paint, leaving the lower part clear to transmit the white signal. Laboratory and field tests conducted on the coated lens resulted in no appreciable deterioration of the red signal; therefore, it was determined that this method of providing the signal was comparable to the split lens assembly. The results of the tests indicate that this method of producing the signal would be suitable for present and future VASI systems.

  • Corporate Authors:

    National Aviation Facilities Experimental Center

    Federal Aviation Administration
    Atlantic City, NJ  United States  08405
  • Authors:
    • Johnston, R E
  • Publication Date: 1977-1

Media Info

  • Pagination: 14 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00151128
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FAA-RD-76-201 Final Rpt., FAA-NA-76-31
  • Files: NTIS, TRIS, USDOT
  • Created Date: Mar 30 1977 12:00AM