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A bona fide TCASII RA creates an altitude deviation altitude excursion by PIC of aircraft X. Near midair collision avoided.
| Attributes | |
| ACN | 187545 |
| Time | |
| Date | 199108 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dal |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 9000 flight time type : 3500 |
| ASRS Report | 187545 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
First officer flying flight from tul-dal. Descending to 3000 ft MSL on radar vector for visual approach to dal. Approach control called VFR traffic at our 12 O'clock position. No altitude readout. We verified the traffic on our TCASII display 1000 ft below us at approximately 5 mi. Through 4200 ft MSL the TCASII traffic indicated a climb and 800 ft below us now at approximately 3 mi. We received a TA as the target continued to climb and at 400 ft separation the TCASII initiated a 'climb' command at between 1500-2000 FPM rate. Climb was initiated and approach control was advised that we were taking evasive action per TCASII to avoid the traffic. No visual contact was made. We leveled at 5000 ft MSL and resumed descent to 3000 ft MSL as the traffic cleared behind us. 1 more instance where the TCASII system may have prevented a midair collision between IFR and VFR traffic.
Original NASA ASRS Text
Title: A BONA FIDE TCASII RA CREATES AN ALT DEV ALT EXCURSION BY PIC OF ACFT X. NMAC AVOIDED.
Narrative: FO FLYING FLT FROM TUL-DAL. DSNDING TO 3000 FT MSL ON RADAR VECTOR FOR VISUAL APCH TO DAL. APCH CTL CALLED VFR TFC AT OUR 12 O'CLOCK POS. NO ALT READOUT. WE VERIFIED THE TFC ON OUR TCASII DISPLAY 1000 FT BELOW US AT APPROX 5 MI. THROUGH 4200 FT MSL THE TCASII TFC INDICATED A CLB AND 800 FT BELOW US NOW AT APPROX 3 MI. WE RECEIVED A TA AS THE TARGET CONTINUED TO CLB AND AT 400 FT SEPARATION THE TCASII INITIATED A 'CLB' COMMAND AT BTWN 1500-2000 FPM RATE. CLB WAS INITIATED AND APCH CTL WAS ADVISED THAT WE WERE TAKING EVASIVE ACTION PER TCASII TO AVOID THE TFC. NO VISUAL CONTACT WAS MADE. WE LEVELED AT 5000 FT MSL AND RESUMED DSCNT TO 3000 FT MSL AS THE TFC CLRED BEHIND US. 1 MORE INSTANCE WHERE THE TCASII SYS MAY HAVE PREVENTED A MIDAIR COLLISION BTWN IFR AND VFR TFC.
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.