Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 11
ATC Issue All Types; Ground Event / Encounter Ground Equipment Issue; Inflight Event / Encounter CFTT / CFIT
General None Reported / Taken
Airspace Structure; Procedure; ATC Equipment / Nav Facility / Buildings
The DFW 17C/35C Glideslope on the ILS and the VNAV on the RNAV is not reliable! Both approaches for both runways; are showing aircraft 100 to 300 feet low all the way down final including the FAF (Final Approach Fix)! Management says it's been flight checked; and it checks out fine. Company said it was something to do with certain aircraft with a FMS update. All aircraft are low on the final. I don't want to be working aircraft down those runway finals during IMC weather when an aircraft is too low to the runway.Even though Management knows it's an issue; they say it's not an issue. They say continue using the approaches; but they want us to take aircraft out further on final; so we don't lose vertical separation with the aircraft next to them. I don't understand how that's an issue if there's 'not an issue.'First; I recommend no Instrument Approaches should be conducted to these two runways ASAP! I know this will delay the airlines; but this is a safety issue! I also recommend the equipment Maintenance Tech get out to the ILS/RNAV equipment; and find out what the problem is. It has to be an equipment issue. It's unsafe and needs to be fixed ASAP!
D10 TRACON Controller reported problems with aircraft being too low on the approach to DFW 17C/35C with possible glide slope issues.