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TCAS gave RA to climb. From FL215 aircraft was climbed to FL220 to eliminate RA, then continued descent to FL210. Traffic reported at FL200.
| Attributes | |
| ACN | 172738 |
| Time | |
| Date | 199103 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : oom |
| State Reference | IN |
| Altitude | msl bound lower : 21000 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid tower : clt |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 11000 flight time type : 8500 |
| ASRS Report | 172738 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 160 flight time total : 1600 flight time type : 80 |
| ASRS Report | 172734 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew Other |
| Miss Distance | horizontal : 3000 vertical : 1500 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While in descent from FL230 to FL210 the TCAS gave us an RA warning which we followed. We were in descent from FL230 to FL210. At approximately FL220 we were given a TA by TCAS for an aircraft level at FL200 at about 21700'. We got a TCAS 'climb,' with climb guidance on the ivsi. We climbed to FL220 where the advisory stopped. We then descended to FL210. During the climb the advisory went to 'reduce climb,' and then back to 'climb' advisory with the appropriate ivsi guidance. The traffic that caused the advisory was reported by ATC to be level at FL200. The TCAS altitude report tag also showed that the aircraft was level at FL200.
Original NASA ASRS Text
Title: TCAS GAVE RA TO CLIMB. FROM FL215 ACFT WAS CLIMBED TO FL220 TO ELIMINATE RA, THEN CONTINUED DESCENT TO FL210. TRAFFIC REPORTED AT FL200.
Narrative: WHILE IN DSNT FROM FL230 TO FL210 THE TCAS GAVE US AN RA WARNING WHICH WE FOLLOWED. WE WERE IN DSNT FROM FL230 TO FL210. AT APPROX FL220 WE WERE GIVEN A TA BY TCAS FOR AN ACFT LEVEL AT FL200 AT ABOUT 21700'. WE GOT A TCAS 'CLB,' WITH CLB GUIDANCE ON THE IVSI. WE CLBED TO FL220 WHERE THE ADVISORY STOPPED. WE THEN DSNDED TO FL210. DURING THE CLB THE ADVISORY WENT TO 'REDUCE CLB,' AND THEN BACK TO 'CLB' ADVISORY WITH THE APPROPRIATE IVSI GUIDANCE. THE TFC THAT CAUSED THE ADVISORY WAS RPTED BY ATC TO BE LEVEL AT FL200. THE TCAS ALT RPT TAG ALSO SHOWED THAT THE ACFT WAS LEVEL AT FL200.
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.