Originally Posted by
APCHCLIMB
You'd be surprised how many 121 pilots give zero consideration to LOC service volume. Not necessarily their fault with the way things work out most of the time.
Same thing with GS service volume.
That's probably the source of "false localizer".
Could be.
I never gave a second thought to the actual service volumes of any NAVAID until I came to this job.
Very little thought to restrictions to those service volumes either.
I'd be very excited if someone could point me to an actual working ILS that has actual false LOC or GS. It would be like finding a needle in a haystack. That is a big part of my job. Find something OT and get in back into service working with The Ops and ATC to accomplish the flight inspection. Most of what we actually find out of tolerance on a LOC for example would be a width measurement. Something that for a pilot would almost be to small to see (for example how many pilot's would actually know the commissioned width of any system which they are flying), then in some inspections that width tolerance is +/- 0.1 degree. Actual FALSE LOC and GS are HUGE discrepancies.
Strange things can happen though. I was putting a system back into service in Louisiana when the technicians basically hooked up the GS transmitter backwards causing an inverted GS signal. On your display the GS cue would have come up from the bottom of the display!
Craziness....I look forward to some of the information provided by those with complaints.