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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Near midair collision. Flight crew followed TCASII alert and climbed to avoid small aircraft. ATC, noticing altitude deviation, told them to descend immediately due to traffic overtaking them at the same altitude.
| Attributes | |
| ACN | 297442 |
| Time | |
| Date | 199502 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ard |
| State Reference | NJ |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zdc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time total : 9200 flight time type : 4000 |
| ASRS Report | 297442 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 250 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At 11000 ft, 20 mi ssw of yardley VOR, with our dash-8 on autoplt, a newark destination, we received a TCASII voice alert (TA) 'traffic, traffic! Monitor vertical speed! Climb, climb!' we obeyed, climbing from 11000-12000 ft for the RA. Frequency congestion was a problem being unable to break in to inform the controller. He called us, noting the 1000 altitude deviation and giving us an immediate clearance back to 11000 ft, citing conflicting traffic, and md-80 overtaking us from behind at 12000 ft. We complied and called the controller, at his request, on the ground, to explain ourselves. He seemed satisfied.
Original NASA ASRS Text
Title: NMAC. FLC FOLLOWED TCASII ALERT AND CLBED TO AVOID SMALL ACFT. ATC, NOTICING ALTDEV, TOLD THEM TO DSND IMMEDIATELY DUE TO TFC OVERTAKING THEM AT THE SAME ALT.
Narrative: AT 11000 FT, 20 MI SSW OF YARDLEY VOR, WITH OUR DASH-8 ON AUTOPLT, A NEWARK DEST, WE RECEIVED A TCASII VOICE ALERT (TA) 'TFC, TFC! MONITOR VERT SPD! CLB, CLB!' WE OBEYED, CLBING FROM 11000-12000 FT FOR THE RA. FREQ CONGESTION WAS A PROB BEING UNABLE TO BREAK IN TO INFORM THE CTLR. HE CALLED US, NOTING THE 1000 ALTDEV AND GIVING US AN IMMEDIATE CLRNC BACK TO 11000 FT, CITING CONFLICTING TFC, AND MD-80 OVERTAKING US FROM BEHIND AT 12000 FT. WE COMPLIED AND CALLED THE CTLR, AT HIS REQUEST, ON THE GND, TO EXPLAIN OURSELVES. HE SEEMED SATISFIED.
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.