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Air carrier X had less than standard TCA radar separation from aircraft Y. Near midair collision. System error. Evasive action taken. TCASII TA RA.
| Attributes | |
| ACN | 185791 |
| Time | |
| Date | 199108 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : orf |
| State Reference | VA |
| Altitude | msl bound lower : 2000 msl bound upper : 2400 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : orf |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 13500 flight time type : 1000 |
| ASRS Report | 185791 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 3000 flight time type : 800 |
| ASRS Report | 185654 |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation non adherence : clearance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was cleared ILS runway 5 to orf, maintain 2000 ft until caley approximately 1 1/2 mi southwest of ingle LOM. I received a TCAS TA followed by a TCAS RA climb now, climb now. Traffic on TCAS display passed directly below me from left to right, 300 ft below. I followed TCAS to climb and reported RA to tower and approach control. Supplemental information from acn 185654. Air carrier X was a 2000 ft MSL, 2 NM from ingle. TCAS reported traffic minus 300 ft crossing left to right, distance less than 6 mi. TA rapidly went to RA with TCAS issuing 'climb, climb.' captain (PF) initiated an immediate climb until RA was cleared. Climb of 400 ft to 2400 ft MSL. Traffic report was given by approach. Approach was controling aircraft Y that was the RA on TCAS.
Original NASA ASRS Text
Title: ACR X HAD LESS THAN STANDARD TCA RADAR SEPARATION FROM ACFT Y. NMAC. SYS ERROR. EVASIVE ACTION TAKEN. TCASII TA RA.
Narrative: ACR X WAS CLRED ILS RWY 5 TO ORF, MAINTAIN 2000 FT UNTIL CALEY APPROX 1 1/2 MI SW OF INGLE LOM. I RECEIVED A TCAS TA FOLLOWED BY A TCAS RA CLB NOW, CLB NOW. TFC ON TCAS DISPLAY PASSED DIRECTLY BELOW ME FROM L TO R, 300 FT BELOW. I FOLLOWED TCAS TO CLB AND RPTED RA TO TWR AND APCH CTL. SUPPLEMENTAL INFO FROM ACN 185654. ACR X WAS A 2000 FT MSL, 2 NM FROM INGLE. TCAS RPTED TFC MINUS 300 FT XING L TO R, DISTANCE LESS THAN 6 MI. TA RAPIDLY WENT TO RA WITH TCAS ISSUING 'CLB, CLB.' CAPT (PF) INITIATED AN IMMEDIATE CLB UNTIL RA WAS CLRED. CLB OF 400 FT TO 2400 FT MSL. TFC RPT WAS GIVEN BY APCH. APCH WAS CTLING ACFT Y THAT WAS THE RA ON TCAS.
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.