Originally Posted by
Jackonicko
Did the E3As have the big light on the front end, Juan?
I don’t think they did, and having done a quick picture search it looks like my memory is good. I am happy to be corrected but from what I remember the big light was for a fall back option in the calibration role if IRFIS failed. It was possible to drop the AEO off with his trusty theodolite and a radio. They would track the light through the theodolite and then compare it to the radar trace of the PAR to assess it. Happy to be corrected or amended by those with better memories.