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ZJX controller experienced operational error at 7400 ft when an incorrect readback was not understood and 1 aircraft ascended to a higher than expected altitude.
| Attributes | |
| ACN | 706253 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ssi.airport |
| State Reference | GA |
| Altitude | msl single value : 7400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | general aviation : personal |
| Make Model Name | PA-46 Malibu |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | general aviation : personal |
| Make Model Name | PA-32 Cherokee Six/Lance/Saratoga |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 1 controller non radar : 2 controller radar : 23 controller time certified in position1 : 13 controller time certified in position2 : 5 |
| ASRS Report | 706253 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance |
| Miss Distance | horizontal : 16200 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X departed ssi airport VFR and called looking for his IFR clearance. I cleared aircraft X 'leaving 4000; cleared to dnl; via direct; climb and maintain 7000.' he read back the clearance 'out of 4000; cleared to dnl; via direct; and up to ten.' I failed to detect the discrepancy. When aircraft X was approaching 7000 ft; I called traffic; '2 O'clock; 4 mi; opposite direction; at 8000.' aircraft X; replied looking for traffic and kept climbing. I thought he was cleared to 7000 ft and he thought he was cleared to 10000 ft. When conflict alert activated; I descended aircraft X to 7000 ft immediately.
Original NASA ASRS Text
Title: ZJX CTLR EXPERIENCED OPERROR AT 7400 FT WHEN AN INCORRECT READBACK WAS NOT UNDERSTOOD AND 1 ACFT ASCENDED TO A HIGHER THAN EXPECTED ALT.
Narrative: ACFT X DEPARTED SSI ARPT VFR AND CALLED LOOKING FOR HIS IFR CLRNC. I CLRED ACFT X 'LEAVING 4000; CLRED TO DNL; VIA DIRECT; CLB AND MAINTAIN 7000.' HE READ BACK THE CLRNC 'OUT OF 4000; CLRED TO DNL; VIA DIRECT; AND UP TO TEN.' I FAILED TO DETECT THE DISCREPANCY. WHEN ACFT X WAS APCHING 7000 FT; I CALLED TFC; '2 O'CLOCK; 4 MI; OPPOSITE DIRECTION; AT 8000.' ACFT X; REPLIED LOOKING FOR TFC AND KEPT CLBING. I THOUGHT HE WAS CLRED TO 7000 FT AND HE THOUGHT HE WAS CLRED TO 10000 FT. WHEN CONFLICT ALERT ACTIVATED; I DSNDED ACFT X TO 7000 FT IMMEDIATELY.
Data retrieved from NASA's ASRS site as of January 2009 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.