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Flight crew of air carrier medium large transport aircraft deviated from descent instructions from ATC to respond to a TCASII RA.
| Attributes | |
| ACN | 232987 |
| Time | |
| Date | 199302 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : djb |
| State Reference | OH |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 6800 flight time type : 4500 |
| ASRS Report | 232987 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 232866 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Instructed to descend to FL270 from FL310. Started descent, while passing through FL290, we had a TCASII alert to climb. Traffic was 1 O'clock and 400 ft below. Seconds later, ZOB instructed us to expedite descent and turn left 30 degrees. We responded to TCASII alert by adding power and climbing while continuing turn to left. At one moment, TCASII showed us at the same altitude. As we climbed in accordance with TCASII information, we spotted traffic visually at 2 O'clock in opposite direction. We resumed descent when TCASII informed us we were 'clear of conflict' and advised ATC when we had been responding to a TCASII alert.
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT DEVIATED FROM DSCNT INSTRUCTIONS FROM ATC TO RESPOND TO A TCASII RA.
Narrative: INSTRUCTED TO DSND TO FL270 FROM FL310. STARTED DSCNT, WHILE PASSING THROUGH FL290, WE HAD A TCASII ALERT TO CLB. TFC WAS 1 O'CLOCK AND 400 FT BELOW. SECONDS LATER, ZOB INSTRUCTED US TO EXPEDITE DSCNT AND TURN L 30 DEGS. WE RESPONDED TO TCASII ALERT BY ADDING PWR AND CLBING WHILE CONTINUING TURN TO L. AT ONE MOMENT, TCASII SHOWED US AT THE SAME ALT. AS WE CLBED IN ACCORDANCE WITH TCASII INFO, WE SPOTTED TFC VISUALLY AT 2 O'CLOCK IN OPPOSITE DIRECTION. WE RESUMED DSCNT WHEN TCASII INFORMED US WE WERE 'CLR OF CONFLICT' AND ADVISED ATC WHEN WE HAD BEEN RESPONDING TO A TCASII ALERT.
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.