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Potential conflict sensed by TCASII RA. Confliction with ATC clearance. Flight crew deviation, non adherence to ATC instruction. Possible operational error.
| Attributes | |
| ACN | 276651 |
| Time | |
| Date | 199407 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sau airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 7000 msl bound upper : 9900 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : oak |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 16000 flight time type : 500 |
| ASRS Report | 276651 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| 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 |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
IFR flight from bli-oak. Clearance to descend to cross 10 NM northeast sau VOR at 7000 ft. At approximately 9500 ft, first officer reported a target on TCASII minus 500 ft at 300 ft. I received 2 messages at the same time. ATC requested 'expedite descent' and TCASII responded 'traffic, traffic' followed by an RA 'climb, climb.' I responded to the RA and climbed to about 9900 ft, and asked first officer to advise ATC we had an RA and were climbing. As soon as we advised ATC, we received a TCASII 'clear of conflict' message. We advised ATC that we were clear of conflict, and ATC requested 'expedite descent.' we complied with the ATC request. Neither the first officer nor I saw traffic. I had little time to see traffic as I was following the RA command, while first officer looked for traffic and advised ATC. We were not given any TA from ATC as they were very busy. TCASII saved the day.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT SENSED BY TCASII RA. CONFLICTION WITH ATC CLRNC. FLC DEV, NON ADHERENCE TO ATC INSTRUCTION. POSSIBLE OPERROR.
Narrative: IFR FLT FROM BLI-OAK. CLRNC TO DSND TO CROSS 10 NM NE SAU VOR AT 7000 FT. AT APPROX 9500 FT, FO RPTED A TARGET ON TCASII MINUS 500 FT AT 300 FT. I RECEIVED 2 MESSAGES AT THE SAME TIME. ATC REQUESTED 'EXPEDITE DSCNT' AND TCASII RESPONDED 'TFC, TFC' FOLLOWED BY AN RA 'CLB, CLB.' I RESPONDED TO THE RA AND CLBED TO ABOUT 9900 FT, AND ASKED FO TO ADVISE ATC WE HAD AN RA AND WERE CLBING. AS SOON AS WE ADVISED ATC, WE RECEIVED A TCASII 'CLR OF CONFLICT' MESSAGE. WE ADVISED ATC THAT WE WERE CLR OF CONFLICT, AND ATC REQUESTED 'EXPEDITE DSCNT.' WE COMPLIED WITH THE ATC REQUEST. NEITHER THE FO NOR I SAW TFC. I HAD LITTLE TIME TO SEE TFC AS I WAS FOLLOWING THE RA COMMAND, WHILE FO LOOKED FOR TFC AND ADVISED ATC. WE WERE NOT GIVEN ANY TA FROM ATC AS THEY WERE VERY BUSY. TCASII SAVED THE DAY.
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.