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Potential conflict averted by TCASII RA and controller intervention. Approach controller 'misspeak' cited as cause by crew.
| Attributes | |
| ACN | 254144 |
| Time | |
| Date | 199310 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dpk |
| State Reference | NY |
| Altitude | msl bound lower : 7700 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 254144 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 700 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
New york approach cleared our aircraft to descend from 9000 ft to 4000 ft approximately 34 mi (338 degree radial) northwest of dpk VOR on the extol arrival. The conflict arose when our aircraft was descending through 8000 ft (approximately 7700 ft) over haarp intersection. Another aircraft at 7000 ft passed left to right within approximately 1 mi. Both aircraft on IFR flight plans. TCASII and controller both said climb back to 8000 ft at the same time. We climbed back to 8000 ft as soon as possible. Clear of conflict. Controller responded we were only cleared to 8000 ft. We heard and read back to the controller cleared to 4000 ft. When controller erred in the clearance altitude he should have caught his error when we read back the altitude to which we were cleared.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT AVERTED BY TCASII RA AND CTLR INTERVENTION. APCH CTLR 'MISSPEAK' CITED AS CAUSE BY CREW.
Narrative: NEW YORK APCH CLRED OUR ACFT TO DSND FROM 9000 FT TO 4000 FT APPROX 34 MI (338 DEG RADIAL) NW OF DPK VOR ON THE EXTOL ARR. THE CONFLICT AROSE WHEN OUR ACFT WAS DSNDING THROUGH 8000 FT (APPROX 7700 FT) OVER HAARP INTXN. ANOTHER ACFT AT 7000 FT PASSED L TO R WITHIN APPROX 1 MI. BOTH ACFT ON IFR FLT PLANS. TCASII AND CTLR BOTH SAID CLB BACK TO 8000 FT AT THE SAME TIME. WE CLBED BACK TO 8000 FT ASAP. CLR OF CONFLICT. CTLR RESPONDED WE WERE ONLY CLRED TO 8000 FT. WE HEARD AND READ BACK TO THE CTLR CLRED TO 4000 FT. WHEN CTLR ERRED IN THE CLRNC ALT HE SHOULD HAVE CAUGHT HIS ERROR WHEN WE READ BACK THE ALT TO WHICH WE WERE CLRED.
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.