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TCASII TA RA alerts crew to potential conflict in overwater operation with opposite direction traffic at same altitude.
| Attributes | |
| ACN | 253298 |
| Time | |
| Date | 199309 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zoa |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : pacific enroute airway : a331 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : pacific enroute : other oceanic |
| Flight Plan | IFR |
| 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 : 11000 flight time type : 2900 |
| ASRS Report | 253298 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 7500 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error other |
Narrative:
TCASII set at 14 mi range. Threat aircraft showed as solid yellow circle and '00' on elevation. Threat aircraft showed up at 2:30 position on TCASII indicator. Visually idented aircraft as widebody transport and decided threat aircraft would pass behind us. Started descent as required by RA alert of TCASII. Unable to get company identify of widebody transport as closing rate and angle was wrong.
Original NASA ASRS Text
Title: TCASII TA RA ALERTS CREW TO POTENTIAL CONFLICT IN OVERWATER OP WITH OPPOSITE DIRECTION TFC AT SAME ALT.
Narrative: TCASII SET AT 14 MI RANGE. THREAT ACFT SHOWED AS SOLID YELLOW CIRCLE AND '00' ON ELEVATION. THREAT ACFT SHOWED UP AT 2:30 POS ON TCASII INDICATOR. VISUALLY IDENTED ACFT AS WDB AND DECIDED THREAT ACFT WOULD PASS BEHIND US. STARTED DSCNT AS REQUIRED BY RA ALERT OF TCASII. UNABLE TO GET COMPANY IDENT OF WDB AS CLOSING RATE AND ANGLE WAS WRONG.
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.