Narrative:

This is a frequency issue. This is a safety hazard. This issue has been known by management for approximately 2 months. I am the cpc (certified professional controller) that identified the issue originally. 124.9 is downey radar frequency.the issue is that downey radar hears what appears to be a stuck microphone; inhibiting downey radar from hearing any aircraft communications. This happens at random times with random cpcs. If you let the 'stuck microphone' persist for several seconds; then 'key up' on top of the stuck microphone; then un-key....the issue is now fixed/gone.aircraft on frequency are unaware of the issue; multiple aircraft over many sessions are queried. Aircraft do not hear the 'stuck microphone'. This is only a reception issue on the controller's side of the communication loop.this is a daily event. [On this day]; prior to me writing this ASRS report it happened to me 4 separate times in one downey radar session.management keeps track of these events on a paper log; although I just became aware of this procedure the other day. I believe it is not widely known that these reports are being requested to be logged by most cpcs. While I was relaying todays reported times of the events to the flm (front line manager); another ATC specialist asked me what was happening; I explained. The controller responded with that happens all the time to me; and that they just thought it a VFR aircraft that was jamming the frequency.this is a known issue. This is a high density airport; and we are using a frequency for the separation of aircraft from terrain and other aircraft; that is not working correctly. Maintenance wants a longer term data log; to narrow the issue; since it is not an obvious fix to them.we operate supposedly in a safety culture; yet we have the knowledge that this is a safety issue; and choose to continue using this unsafe frequency.

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Original NASA ASRS Text

Title: SCT Controller reported a known recurrent anomaly; which renders the Downey sector frequency unusable. Maintenance has failed to fix this.

Narrative: This is a FREQUENCY issue. This is a SAFETY HAZARD. This issue has been known by management for approximately 2 months. I am the CPC (Certified Professional Controller) that identified the issue originally. 124.9 is Downey Radar frequency.The issue is that Downey Radar hears what appears to be a stuck microphone; inhibiting Downey Radar from hearing any aircraft communications. This happens at random times with random CPCs. If you let the 'stuck microphone' persist for several seconds; then 'key up' on top of the stuck microphone; then un-key....the issue is now fixed/gone.Aircraft on frequency are unaware of the issue; multiple aircraft over many sessions are queried. Aircraft do not hear the 'stuck microphone'. This is only a reception issue on the controller's side of the communication loop.This is a daily event. [On this day]; prior to me writing this ASRS report it happened to me 4 separate times in one Downey Radar session.Management keeps track of these events on a paper log; although I just became aware of this procedure the other day. I believe it is not widely known that these reports are being requested to be logged by most CPCs. While I was relaying todays reported times of the events to the FLM (Front Line Manager); another ATC Specialist asked me what was happening; I explained. The controller responded with that happens all the time to me; and that they just thought it a VFR aircraft that was jamming the frequency.This is a known issue. This is a High Density Airport; and we are using a frequency for the separation of aircraft from terrain and other aircraft; that is not working correctly. Maintenance wants a longer term data log; to narrow the issue; since it is not an obvious fix to them.We operate supposedly in a safety culture; yet we have the knowledge that this is a safety issue; AND CHOOSE to continue using this UNSAFE frequency.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.