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Operational error occurred when ZNY ARTCC radar controller did not hear an incorrect readback resulting in a loss of separation between a crj and an MD80.
| Attributes | |
| ACN | 584572 |
| Time | |
| Date | 200306 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : jfk.airport |
| State Reference | NY |
| Altitude | msl single value : 25000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc artcc : zny.artcc tower : cle.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zbw.artcc artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller time certified in position1 : 2 |
| ASRS Report | 584572 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar/mode c aircraft equipment : tcas other controllera other controllerb other flight crewa other flight crewb other other : 3 |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28200 vertical : 300 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X inbound to pvd via rbv. Hto given clearance by ZNY X65W hto at FL270. Pilot read back X65W at FL250. ZNY controller did not catch. ZNY controller also working aircraft Y via dpk to bdl given X dpk at FL190 (currently at FL250). Aircraft X does not ever report leaving FL290. Aircraft checks in with ZBW with crossing restr. Controller did not hear pilot say, FL250 and is expecting FL270 descent. Aircraft X leaves FL290 to FL250 without a report. Separation lost between aircraft Y and aircraft X also in steep angle of descent causing only 1 mode C readout to alert controller, showing leaving FL260 (too late). Controller question and assigned new altitude to aircraft X. Factors: aircraft X not getting clearance right, ZNY controller not catching aircraft X readback, ZNY changing aircraft X to another frequency before separation assured, ZBW controller missed check in altitude and aircraft X did not report out of FL290 for FL250 allowing aircraft X final opportunity to catch situation.
Original NASA ASRS Text
Title: OPERROR OCCURRED WHEN ZNY ARTCC RADAR CTLR DID NOT HEAR AN INCORRECT READBACK RESULTING IN A LOSS OF SEPARATION BTWN A CRJ AND AN MD80.
Narrative: ACFT X INBOUND TO PVD VIA RBV. HTO GIVEN CLRNC BY ZNY X65W HTO AT FL270. PLT READ BACK X65W AT FL250. ZNY CTLR DID NOT CATCH. ZNY CTLR ALSO WORKING ACFT Y VIA DPK TO BDL GIVEN X DPK AT FL190 (CURRENTLY AT FL250). ACFT X DOES NOT EVER RPT LEAVING FL290. ACFT CHKS IN WITH ZBW WITH XING RESTR. CTLR DID NOT HEAR PLT SAY, FL250 AND IS EXPECTING FL270 DSCNT. ACFT X LEAVES FL290 TO FL250 WITHOUT A RPT. SEPARATION LOST BTWN ACFT Y AND ACFT X ALSO IN STEEP ANGLE OF DSCNT CAUSING ONLY 1 MODE C READOUT TO ALERT CTLR, SHOWING LEAVING FL260 (TOO LATE). CTLR QUESTION AND ASSIGNED NEW ALT TO ACFT X. FACTORS: ACFT X NOT GETTING CLRNC RIGHT, ZNY CTLR NOT CATCHING ACFT X READBACK, ZNY CHANGING ACFT X TO ANOTHER FREQ BEFORE SEPARATION ASSURED, ZBW CTLR MISSED CHK IN ALT AND ACFT X DID NOT RPT OUT OF FL290 FOR FL250 ALLOWING ACFT X FINAL OPPORTUNITY TO CATCH SIT.
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.