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First officer of medium large transport air carrier aircraft responded to a TCASII RA and climbed above assigned altitude and then overshot the assigned altitude when returning.
| Attributes | |
| ACN | 208115 |
| Time | |
| Date | 199204 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mod |
| State Reference | CA |
| Altitude | msl bound lower : 10600 msl bound upper : 12500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zoa |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 18000 flight time type : 75 |
| ASRS Report | 208115 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 3700 |
| ASRS Report | 208204 |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending into sfo on modesto 2 STAR, approaching cedes intersection, just about to level 11000. Heard 'traffic' on TCASII followed shortly by 'climb' command. We had not been warned abut traffic from oak center. I advised first officer (PF) to climb. Climbed to approximately 12500 ft before leveling. Never saw aircraft, but he saw us and advised ATC of such. During descent back to 11000, we overshot and descended to approximately 10600 ft. The deviation from the originally assigned altitude of 11000 ft was partially the result of speed brakes being extended during our original descent. They remained deployed throughout our evasive maneuver, and were stowed once we re-attained our 11000 ft assigned altitude. Supplemental information from acn 208204: the aircraft we avoided was not called out to us by oak ARTCC nor did we acquire it visually. Apparently, it was transiting the area VFR at 10500 ft MSL. VFR aircraft did spot us visually as we performed the RA escape maneuver and reported same to oak ARTCC.
Original NASA ASRS Text
Title: FO OF MLG ACR ACFT RESPONDED TO A TCASII RA AND CLBED ABOVE ASSIGNED ALT AND THEN OVERSHOT THE ASSIGNED ALT WHEN RETURNING.
Narrative: DSNDING INTO SFO ON MODESTO 2 STAR, APCHING CEDES INTXN, JUST ABOUT TO LEVEL 11000. HEARD 'TFC' ON TCASII FOLLOWED SHORTLY BY 'CLB' COMMAND. WE HAD NOT BEEN WARNED ABUT TFC FROM OAK CTR. I ADVISED FO (PF) TO CLB. CLBED TO APPROX 12500 FT BEFORE LEVELING. NEVER SAW ACFT, BUT HE SAW US AND ADVISED ATC OF SUCH. DURING DSCNT BACK TO 11000, WE OVERSHOT AND DSNDED TO APPROX 10600 FT. THE DEV FROM THE ORIGINALLY ASSIGNED ALT OF 11000 FT WAS PARTIALLY THE RESULT OF SPD BRAKES BEING EXTENDED DURING OUR ORIGINAL DSCNT. THEY REMAINED DEPLOYED THROUGHOUT OUR EVASIVE MANEUVER, AND WERE STOWED ONCE WE RE-ATTAINED OUR 11000 FT ASSIGNED ALT. SUPPLEMENTAL INFO FROM ACN 208204: THE ACFT WE AVOIDED WAS NOT CALLED OUT TO US BY OAK ARTCC NOR DID WE ACQUIRE IT VISUALLY. APPARENTLY, IT WAS TRANSITING THE AREA VFR AT 10500 FT MSL. VFR ACFT DID SPOT US VISUALLY AS WE PERFORMED THE RA ESCAPE MANEUVER AND RPTED SAME TO OAK ARTCC.
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.