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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A false TCASII RA temporarily directed the reporter to climb towards traffic that was above him in level flight.
| Attributes | |
| ACN | 300338 |
| Time | |
| Date | 199503 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : czq |
| State Reference | CA |
| Altitude | msl bound lower : 31000 msl bound upper : 31200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla tower : bdr |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other 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 : 200 flight time total : 10000 flight time type : 200 |
| ASRS Report | 300338 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Level at 31000 ft TCASII gave a TA and changed to an RA with a 'climb climb' audio command and the pitch cues. We began a climb. First officer immediately advised ATC we were climbing due to TCASII advisory. ATC controller told us to descend to 31000 ft and advised us that we had traffic at our 6 O'clock position level at 33000 ft. We again advised him that we were following TCASII instructions. At this point the TCASII warning changed to 'descend descend' with pitch cues, which we again followed. When we leveled at 31000 ft, we received a 'clear of conflict' advisory. I followed this incident up with a phone call to ZLA to confirm our situation and reaction. We were told that no separation was lost.
Original NASA ASRS Text
Title: A FALSE TCASII RA TEMPORARILY DIRECTED THE RPTR TO CLB TOWARDS TFC THAT WAS ABOVE HIM IN LEVEL FLT.
Narrative: LEVEL AT 31000 FT TCASII GAVE A TA AND CHANGED TO AN RA WITH A 'CLB CLB' AUDIO COMMAND AND THE PITCH CUES. WE BEGAN A CLB. FO IMMEDIATELY ADVISED ATC WE WERE CLBING DUE TO TCASII ADVISORY. ATC CTLR TOLD US TO DSND TO 31000 FT AND ADVISED US THAT WE HAD TFC AT OUR 6 O'CLOCK POS LEVEL AT 33000 FT. WE AGAIN ADVISED HIM THAT WE WERE FOLLOWING TCASII INSTRUCTIONS. AT THIS POINT THE TCASII WARNING CHANGED TO 'DSND DSND' WITH PITCH CUES, WHICH WE AGAIN FOLLOWED. WHEN WE LEVELED AT 31000 FT, WE RECEIVED A 'CLR OF CONFLICT' ADVISORY. I FOLLOWED THIS INCIDENT UP WITH A PHONE CALL TO ZLA TO CONFIRM OUR SIT AND REACTION. WE WERE TOLD THAT NO SEPARATION WAS LOST.
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.