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Air carrier X TCASII RA climb had less than standard separation from aircraft Y. Evasive action taken. System error.
| Attributes | |
| ACN | 230499 |
| Time | |
| Date | 199301 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sli |
| State Reference | CA |
| Altitude | msl bound lower : 11300 msl bound upper : 11300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : sna |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 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 | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 20000 flight time type : 3500 |
| ASRS Report | 230499 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 20000 flight time type : 1400 |
| ASRS Report | 230502 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
IFR conditions, cleared direct sli from sxc. Cleared to leave 12000 ft to 10000 ft by coast approach. When established at approximately 1000 FPM descent, controller said expedite descent. Then said immediate 20 degree right turn. At 11300, in right turn, TCASII gave red warning conflict and 'climb.' I pulled up and rolled out on a heading 20-40 degrees from original course and leveled at approximately 12500. We started to break out and picked up traffic below and about 11 O'clock. Traffic Y was level 11000 ft left to right. TCASII indicated approximately 1 1/2 to 2 mi. During this climb, approach called and said they had observed our climbing and to continue and level at 12000. The captain told approach we had responded to conflict. When clear, we were given clearance direct to sli and cross sli at 7000. Then switched to lax approach and coast approach controller thanked us for our help!
Original NASA ASRS Text
Title: ACR X TCASII RA CLB HAD LTSS FROM ACFT Y. EVASIVE ACTION TAKEN. SYS ERROR.
Narrative: IFR CONDITIONS, CLRED DIRECT SLI FROM SXC. CLRED TO LEAVE 12000 FT TO 10000 FT BY COAST APCH. WHEN ESTABLISHED AT APPROX 1000 FPM DSCNT, CTLR SAID EXPEDITE DSCNT. THEN SAID IMMEDIATE 20 DEG R TURN. AT 11300, IN R TURN, TCASII GAVE RED WARNING CONFLICT AND 'CLB.' I PULLED UP AND ROLLED OUT ON A HDG 20-40 DEGS FROM ORIGINAL COURSE AND LEVELED AT APPROX 12500. WE STARTED TO BREAK OUT AND PICKED UP TFC BELOW AND ABOUT 11 O'CLOCK. TFC Y WAS LEVEL 11000 FT L TO R. TCASII INDICATED APPROX 1 1/2 TO 2 MI. DURING THIS CLB, APCH CALLED AND SAID THEY HAD OBSERVED OUR CLBING AND TO CONTINUE AND LEVEL AT 12000. THE CAPT TOLD APCH WE HAD RESPONDED TO CONFLICT. WHEN CLR, WE WERE GIVEN CLRNC DIRECT TO SLI AND CROSS SLI AT 7000. THEN SWITCHED TO LAX APCH AND COAST APCH CTLR THANKED US FOR OUR HELP!
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.