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Descending to 10000 ft at autoplt capture got TA and RA. Traffic sighted at RA no evasive action required. Autoplt failed to capture altitude. Got to 9700 ft. Widebody transport.
| Attributes | |
| ACN | 343010 |
| Time | |
| Date | 199608 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pdx |
| State Reference | OR |
| Altitude | msl bound lower : 9700 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pdx |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival : profile descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 60 flight time total : 13000 flight time type : 1900 |
| ASRS Report | 343010 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were cleared to 10000 ft on approach to runway 10R at pdx. As autoplt went into capture mode, a TA went off in the TCASII. Visually unable to locate aircraft due to undercast. Shortly thereafter, the TA changed to an RA. I was now able to see the other aircraft coming out of the clouds and determined that no evasive action was required. At this time the first officer reported we were still descending. I disengaged the autoplt and returned the aircraft to 10000 ft. We had descended to between 9700 ft and 9800 ft. Approach was continued with no further incident.
Original NASA ASRS Text
Title: DSNDING TO 10000 FT AT AUTOPLT CAPTURE GOT TA AND RA. TFC SIGHTED AT RA NO EVASIVE ACTION REQUIRED. AUTOPLT FAILED TO CAPTURE ALT. GOT TO 9700 FT. WDB.
Narrative: WE WERE CLRED TO 10000 FT ON APCH TO RWY 10R AT PDX. AS AUTOPLT WENT INTO CAPTURE MODE, A TA WENT OFF IN THE TCASII. VISUALLY UNABLE TO LOCATE ACFT DUE TO UNDERCAST. SHORTLY THEREAFTER, THE TA CHANGED TO AN RA. I WAS NOW ABLE TO SEE THE OTHER ACFT COMING OUT OF THE CLOUDS AND DETERMINED THAT NO EVASIVE ACTION WAS REQUIRED. AT THIS TIME THE FO RPTED WE WERE STILL DSNDING. I DISENGAGED THE AUTOPLT AND RETURNED THE ACFT TO 10000 FT. WE HAD DSNDED TO BTWN 9700 FT AND 9800 FT. APCH WAS CONTINUED WITH NO FURTHER INCIDENT.
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.