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An large transport air carrier crew climbed in response to a TCASII alert command. The traffic was not seen visually but was seen on radar.
| Attributes | |
| ACN | 217284 |
| Time | |
| Date | 199208 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : scy airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star enroute airway : dfw |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 4500 flight time type : 1400 |
| ASRS Report | 217284 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While on the scurry arrival to dfw and level at 11000 and 250 KTS, an unidented VFR aircraft appeared on our TCASII. The aircraft went from a TA (yellow) to a full RA (red) with an aural command to climb. Without any visual sighting on the aircraft, I elected to climb to 12000 MSL. The conflict was soon over and I descended the aircraft to 11000 (assigned altitude). ATC was informed of the deviation. ATC also advised us of the VFR aircraft, but without any visual reference to the aircraft, I elected to climb from my assigned altitude. This situation (TAS and ras) happens quite frequently while on the 4 arrs to dfw. Most inbounds are level at 11000, while most outbound are climbing at a high rate to 10000. This causes many TCASII alerts, most of which are false.
Original NASA ASRS Text
Title: AN LGT ACR CREW CLBED IN RESPONSE TO A TCASII ALERT COMMAND. THE TFC WAS NOT SEEN VISUALLY BUT WAS SEEN ON RADAR.
Narrative: WHILE ON THE SCURRY ARR TO DFW AND LEVEL AT 11000 AND 250 KTS, AN UNIDENTED VFR ACFT APPEARED ON OUR TCASII. THE ACFT WENT FROM A TA (YELLOW) TO A FULL RA (RED) WITH AN AURAL COMMAND TO CLB. WITHOUT ANY VISUAL SIGHTING ON THE ACFT, I ELECTED TO CLB TO 12000 MSL. THE CONFLICT WAS SOON OVER AND I DSNDED THE ACFT TO 11000 (ASSIGNED ALT). ATC WAS INFORMED OF THE DEV. ATC ALSO ADVISED US OF THE VFR ACFT, BUT WITHOUT ANY VISUAL REF TO THE ACFT, I ELECTED TO CLB FROM MY ASSIGNED ALT. THIS SITUATION (TAS AND RAS) HAPPENS QUITE FREQUENTLY WHILE ON THE 4 ARRS TO DFW. MOST INBOUNDS ARE LEVEL AT 11000, WHILE MOST OUTBOUND ARE CLBING AT A HIGH RATE TO 10000. THIS CAUSES MANY TCASII ALERTS, MOST OF WHICH ARE FALSE.
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.