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Controller descended fgt to altitude vacated by small transport, less than standard separation occurred.
| Attributes | |
| ACN | 193123 |
| Time | |
| Date | 199110 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cew airport : pns airport : vps |
| State Reference | FL |
| Altitude | msl bound lower : 14400 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Fighter |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 23 |
| ASRS Report | 193123 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 13500 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I had small transport X landing at pensacola, fl, descending to 14000 and a fgt Y landing at eglin AFB, fl, when I observed the small transport X descending out of approximately 15500. I cleared the fgt Y to 15000. The sector was busy at the time with numerous departures from both the pensacola and the eglin complexes. Because of the tremendous amount of military airspace these departures are always head-on with the arrs to these 2 complexes. When the conflict alert went off, I attempted to determine the altitude of the fgt Y. His reply was unreadable so I attempted to verify that the small transport X was level at 14000. I believed the small transport X reported level. However, on the tape playback the small transport X reported out of 14600. I evidently heard 14000, an altitude I needed on the small transport X. By this time the 'snitch' had printed at the watch desk indicating less than standard separation. This error is a result of my hearing (or not listening) a readback incorrectly.
Original NASA ASRS Text
Title: CTLR DSNDED FGT TO ALT VACATED BY SMT, LTSS OCCURRED.
Narrative: I HAD SMT X LNDG AT PENSACOLA, FL, DSNDING TO 14000 AND A FGT Y LNDG AT EGLIN AFB, FL, WHEN I OBSERVED THE SMT X DSNDING OUT OF APPROX 15500. I CLRED THE FGT Y TO 15000. THE SECTOR WAS BUSY AT THE TIME WITH NUMEROUS DEPS FROM BOTH THE PENSACOLA AND THE EGLIN COMPLEXES. BECAUSE OF THE TREMENDOUS AMOUNT OF MIL AIRSPACE THESE DEPS ARE ALWAYS HEAD-ON WITH THE ARRS TO THESE 2 COMPLEXES. WHEN THE CONFLICT ALERT WENT OFF, I ATTEMPTED TO DETERMINE THE ALT OF THE FGT Y. HIS REPLY WAS UNREADABLE SO I ATTEMPTED TO VERIFY THAT THE SMT X WAS LEVEL AT 14000. I BELIEVED THE SMT X RPTED LEVEL. HOWEVER, ON THE TAPE PLAYBACK THE SMT X RPTED OUT OF 14600. I EVIDENTLY HEARD 14000, AN ALT I NEEDED ON THE SMT X. BY THIS TIME THE 'SNITCH' HAD PRINTED AT THE WATCH DESK INDICATING LTSS. THIS ERROR IS A RESULT OF MY HEARING (OR NOT LISTENING) A READBACK INCORRECTLY.
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.