A cmh approach controller observes a low altitude alert and a conflict alert flashing on radar, but did not hear the aural alarm associated with the alerts.

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Attributes
ACN	636824
Time
Date	200411
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cmh.tracon
State Reference	OH
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 22 controller time certified in position1 : 22
ASRS Report	636824
Person 2
Affiliation	government : faa
Function	controller : supervisor
Events
Independent Detector	atc equipment : msaw atc equipment : conflict alert atc equipment other atc equipment : stars other controllera other controllerb
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

As an aircraft was doing an approach into a satellite airport, I noticed 'la' flashing. That was not unexpected. However, what I noticed was there was no audible alarm in conjunction with this alert. (We are on the new stars equipment.) I immediately verified the setting on my volume. It was set to 2. I then performed an alarm test (multi-function Z a). The alarm still didn't sound. I demonstrated this non-functioning alarm to a supervisor. I then decided to see if I could change my volume setting. As soon as I tried that, the audible alarm began functioning again.

Original NASA ASRS Text

Title: A CMH APCH CTLR OBSERVES A LOW ALT ALERT AND A CONFLICT ALERT FLASHING ON RADAR, BUT DID NOT HEAR THE AURAL ALARM ASSOCIATED WITH THE ALERTS.

Narrative: AS AN ACFT WAS DOING AN APCH INTO A SATELLITE ARPT, I NOTICED 'LA' FLASHING. THAT WAS NOT UNEXPECTED. HOWEVER, WHAT I NOTICED WAS THERE WAS NO AUDIBLE ALARM IN CONJUNCTION WITH THIS ALERT. (WE ARE ON THE NEW STARS EQUIP.) I IMMEDIATELY VERIFIED THE SETTING ON MY VOLUME. IT WAS SET TO 2. I THEN PERFORMED AN ALARM TEST (MULTI-FUNCTION Z A). THE ALARM STILL DIDN'T SOUND. I DEMONSTRATED THIS NON-FUNCTIONING ALARM TO A SUPVR. I THEN DECIDED TO SEE IF I COULD CHANGE MY VOLUME SETTING. AS SOON AS I TRIED THAT, THE AUDIBLE ALARM BEGAN FUNCTIONING AGAIN.

Data retrieved from NASA's ASRS site as of July 2007 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.