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Flight crew of an MD88 descended from assigned altitude in response to a TCASII RA. TA given by approach control of VFR traffic climbing to their altitude.
| Attributes | |
| ACN | 418434 |
| Time | |
| Date | 199810 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : oak airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : private pilot : instrument |
| Experience | flight time last 90 days : 60 flight time total : 3400 flight time type : 200 |
| ASRS Report | 418434 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 4000 flight time type : 800 |
| ASRS Report | 418550 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
On descent into oak, received traffic call from ZOA at 2 O'clock, climbing to our altitude. Approximately 10 seconds later, and with no visual contact, we received a TCASII alert, then RA to descend. The captain disengaged the autoplt and started a descent. At 10600 ft MSL, the conflict was over and we notified ATC of our altitude deviation and climbed back to 11000 ft. We continued to oak for an uneventful landing.
Original NASA ASRS Text
Title: FLC OF AN MD88 DSNDED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA. TA GIVEN BY APCH CTL OF VFR TFC CLBING TO THEIR ALT.
Narrative: ON DSCNT INTO OAK, RECEIVED TFC CALL FROM ZOA AT 2 O'CLOCK, CLBING TO OUR ALT. APPROX 10 SECONDS LATER, AND WITH NO VISUAL CONTACT, WE RECEIVED A TCASII ALERT, THEN RA TO DSND. THE CAPT DISENGAGED THE AUTOPLT AND STARTED A DSCNT. AT 10600 FT MSL, THE CONFLICT WAS OVER AND WE NOTIFIED ATC OF OUR ALTDEV AND CLBED BACK TO 11000 FT. WE CONTINUED TO OAK FOR AN UNEVENTFUL LNDG.
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.