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ARTCC radar controller issued a descent clearance to small aircraft. Pilot read back wrong altitude. Small aircraft passed behind the small transport with less than standard separation.
| Attributes | |
| ACN | 157482 |
| Time | |
| Date | 199009 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : cmh |
| State Reference | OH |
| Altitude | msl bound lower : 10000 msl bound upper : 10500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Retractable Gear |
| Flight Phase | descent other |
| Route In Use | departure sid : sid enroute airway : zid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 157482 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Small aircraft lns shirt V5 luk at 12000' and small transport cvg gaill 4 cmh at 10000'. Small aircraft was in an area where he needed to start his descend for luk. I descended small aircraft to 11000'. The pilot read back, 'I'm out of 1-2000 for 1-1 (short pause), 1-0-thousand.' several seconds later I rogered for the transmission. As the aircraft started his descent, normal sector operations when on. Passage had now taken place behind the nebnd small transport. I noticed 10700' in the data block of small aircraft. I asked the pilot his altitude (I thought possible mode C error). Pilot said, 'I'm out of 105 for 100.' I proceeded to call cmza controller and point out small aircraft. His response: 'I've been watching.' I proceeded to climb small aircraft back to 11000'. C/a and odep activated at same time. It all boils down to a missed readback.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR ISSUED A DESCENT CLRNC TO SMA. PLT READ BACK WRONG ALT. SMA PASSED BEHIND THE SMT WITH LESS THAN STANDARD SEPARATION.
Narrative: SMA LNS SHIRT V5 LUK AT 12000' AND SMT CVG GAILL 4 CMH AT 10000'. SMA WAS IN AN AREA WHERE HE NEEDED TO START HIS DSND FOR LUK. I DSNDED SMA TO 11000'. THE PLT READ BACK, 'I'M OUT OF 1-2000 FOR 1-1 (SHORT PAUSE), 1-0-THOUSAND.' SEVERAL SECS LATER I ROGERED FOR THE XMISSION. AS THE ACFT STARTED HIS DSNT, NORMAL SECTOR OPS WHEN ON. PASSAGE HAD NOW TAKEN PLACE BEHIND THE NEBND SMT. I NOTICED 10700' IN THE DATA BLOCK OF SMA. I ASKED THE PLT HIS ALT (I THOUGHT POSSIBLE MODE C ERROR). PLT SAID, 'I'M OUT OF 105 FOR 100.' I PROCEEDED TO CALL CMZA CTLR AND POINT OUT SMA. HIS RESPONSE: 'I'VE BEEN WATCHING.' I PROCEEDED TO CLB SMA BACK TO 11000'. C/A AND ODEP ACTIVATED AT SAME TIME. IT ALL BOILS DOWN TO A MISSED READBACK.
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.