Improved Fresnel Lens Optical Landing System (FLOLS)
IMPROVED FRESNEL LENS OPTICAL LANDING SYSTEM (IFLOLS)
The IFLOLS (Figure 6) is replacing the presently used FLOLS (pp 3-6). The theory and operation of the
FLOLS and IFLOLS are the same. Primary differences are:
The IFLOLS has 7 additional cells, for a total of 12. This allows for more exact glideslope information, and
a higher definition visual aid which can be referenced out to 1.5 nm. The IFLOLS will appear to be much
more sensitive due to its increased accuracy.
The number of Datum Lights has increased to 10.
The vertical coverage has been increased to 1.7 degrees vice the 1.5 of FLOLS.
Acquisition range has been increased from 3/4 nm to 1 1/2 nm.
Due to present limited shipboard use IFLOLS, you will be briefed and FCLPed with a shore based IFLOLS,
prior to CQ using IFLOLS.
Figure 6: IMPROVED FRESNEL LENS (1 OF 2)
(7-01) Change 2