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TCASII RA commanded descend. The reporter began to comply. The first officer visual sighting deemed climb. Maybe collide if descend.
| Attributes | |
| ACN | 277119 |
| Time | |
| Date | 199407 |
| Day | Wed |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 13000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 25 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 277119 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Miss Distance | unspecified : 1000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On departure from ord being vectored to petty and cleared to FL140. A lear jet in front of us was cleared to FL130. It appeared that the lear jet was climbing faster than we were and actually climbed to our altitude. Around FL130 we got a TCASII RA to monitor vertical climb -- then we got a descent command. I disconnected the autoplt and started to follow the commands when my copilot told me not to descend but instead to continue climbing to avoid the lear jet. Without visual contact we may have hit the lear jet if we had followed TCASII.
Original NASA ASRS Text
Title: TCASII RA COMMANDED DSND. THE RPTR BEGAN TO COMPLY. THE FO VISUAL SIGHTING DEEMED CLB. MAYBE COLLIDE IF DSND.
Narrative: ON DEP FROM ORD BEING VECTORED TO PETTY AND CLRED TO FL140. A LEAR JET IN FRONT OF US WAS CLRED TO FL130. IT APPEARED THAT THE LEAR JET WAS CLBING FASTER THAN WE WERE AND ACTUALLY CLBED TO OUR ALT. AROUND FL130 WE GOT A TCASII RA TO MONITOR VERT CLB -- THEN WE GOT A DSCNT COMMAND. I DISCONNECTED THE AUTOPLT AND STARTED TO FOLLOW THE COMMANDS WHEN MY COPLT TOLD ME NOT TO DSND BUT INSTEAD TO CONTINUE CLBING TO AVOID THE LEAR JET. WITHOUT VISUAL CONTACT WE MAY HAVE HIT THE LEAR JET IF WE HAD FOLLOWED TCASII.
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.