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Air carrier flight crew descended and then climbed in response to TCASII RA caused by another aircraft climbing from assigned altitude.
| Attributes | |
| ACN | 526374 |
| Time | |
| Date | 200110 |
| Day | Mon |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : dfw.airport |
| State Reference | TX |
| Altitude | msl single value : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zfw.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : military |
| Experience | flight time last 90 days : 250 flight time total : 10500 flight time type : 250 |
| ASRS Report | 526374 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 6000 vertical : 200 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
En route to dfw FL370. Cleared to descend to 11000 ft MSL. At approximately FL310 descent clearance revised to FL200. Approximately 60-70 mi, level at FL200, west of dfw airport, ZFW called traffic 20 mi 10-11 O'clock position, FL190, on a southwesterly heading. As the aircraft closed within approximately 5 mi on TCASII, it started to climb and TCASII alert 'traffic, traffic' annunciated. TCASII showed other aircraft 600 ft below my altitude. Shortly after TCASII annunciated RA to 'descend' followed shortly after to 'climb,' contacted ZFW of RA and departed FL200. Fort worth cleared me to FL230. Other aircraft showed approximately 200 ft below and approximately 1 mi laterally. Contacted ZFW and stopped climb at FL220. Once clear of traffic remainder of descent and approach to dfw was uneventful. Even though VFR conditions unable to attain visual on aircraft due to bright lights from the dfw area.
Original NASA ASRS Text
Title: ACR FLC DSNDED AND THEN CLBED IN RESPONSE TO TCASII RA CAUSED BY ANOTHER ACFT CLBING FROM ASSIGNED ALT.
Narrative: ENRTE TO DFW FL370. CLRED TO DSND TO 11000 FT MSL. AT APPROX FL310 DSCNT CLRNC REVISED TO FL200. APPROX 60-70 MI, LEVEL AT FL200, W OF DFW ARPT, ZFW CALLED TFC 20 MI 10-11 O'CLOCK POS, FL190, ON A SOUTHWESTERLY HEADING. AS THE ACFT CLOSED WITHIN APPROX 5 MI ON TCASII, IT STARTED TO CLB AND TCASII ALERT 'TFC, TFC' ANNUNCIATED. TCASII SHOWED OTHER ACFT 600 FT BELOW MY ALT. SHORTLY AFTER TCASII ANNUNCIATED RA TO 'DSND' FOLLOWED SHORTLY AFTER TO 'CLB,' CONTACTED ZFW OF RA AND DEPARTED FL200. FORT WORTH CLRED ME TO FL230. OTHER ACFT SHOWED APPROX 200 FT BELOW AND APPROX 1 MI LATERALLY. CONTACTED ZFW AND STOPPED CLB AT FL220. ONCE CLR OF TFC REMAINDER OF DSCNT AND APCH TO DFW WAS UNEVENTFUL. EVEN THOUGH VFR CONDITIONS UNABLE TO ATTAIN VISUAL ON ACFT DUE TO BRIGHT LIGHTS FROM THE DFW AREA.
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.