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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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TCASII sensed a nonexistent conflict and caused medium large transport to deviate 450 ft above assigned altitude.
| Attributes | |
| ACN | 236490 |
| Time | |
| Date | 199303 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sdz |
| State Reference | NC |
| Altitude | msl bound lower : 29000 msl bound upper : 29450 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : ztl |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude 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 : 225 flight time total : 6300 flight time type : 400 |
| ASRS Report | 236490 |
| 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 |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While cruising at FL290, traffic was reported to be at 11 O'clock, climbing to FL280. TCASII issued a TA then RA with command to climb. Initiated a climb to 29450 ft, then monitored vertical speed per TCASII. Descended back to FL290. ATC was advised of the climb. ATC then replied that crossing traffic leveled at FL280 and there was no conflict. Software problems with TCASII need to be fixed. If there had been crossing traffic above our aircraft, a conflict would have been created for no reason.
Original NASA ASRS Text
Title: TCASII SENSED A NONEXISTENT CONFLICT AND CAUSED MLG TO DEVIATE 450 FT ABOVE ASSIGNED ALT.
Narrative: WHILE CRUISING AT FL290, TFC WAS RPTED TO BE AT 11 O'CLOCK, CLBING TO FL280. TCASII ISSUED A TA THEN RA WITH COMMAND TO CLB. INITIATED A CLB TO 29450 FT, THEN MONITORED VERT SPD PER TCASII. DSNDED BACK TO FL290. ATC WAS ADVISED OF THE CLB. ATC THEN REPLIED THAT XING TFC LEVELED AT FL280 AND THERE WAS NO CONFLICT. SOFTWARE PROBS WITH TCASII NEED TO BE FIXED. IF THERE HAD BEEN XING TFC ABOVE OUR ACFT, A CONFLICT WOULD HAVE BEEN CREATED FOR NO REASON.
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.