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Flight crew on MD80 inbound to pdx receive TCASII RA to descend. ATC had just instructed the flight to climb. Traffic was a bonanza at 8000 ft which may have been crossing the MD80 flight path.
| Attributes | |
| ACN | 409900 |
| Time | |
| Date | 199808 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : btg airport : pdx |
| State Reference | OR |
| Altitude | msl bound lower : 7200 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pdx |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Bonanza 35 |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 16700 flight time type : 7000 |
| ASRS Report | 409900 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
We had just leveled at 8000 ft on the moxee 3 arrival to pdx when approach cleared us to climb to 8500 ft. At about the same time we received this clearance we got a TCASII RA to descend. We followed the TCASII RA to about 7200 ft where we received a clear of conflict and started a climb back to our last assigned altitude of 8500 ft. We advised ATC of the TCASII RA when it occurred and received another clearance shortly thereafter to descend pilot's discretion to 5000 ft. The TCASII RA was caused by a GA bonanza at 8000 ft at about our 3 O'clock position.
Original NASA ASRS Text
Title: FLC ON MD80 INBOUND TO PDX RECEIVE TCASII RA TO DSND. ATC HAD JUST INSTRUCTED THE FLT TO CLB. TFC WAS A BONANZA AT 8000 FT WHICH MAY HAVE BEEN XING THE MD80 FLT PATH.
Narrative: WE HAD JUST LEVELED AT 8000 FT ON THE MOXEE 3 ARR TO PDX WHEN APCH CLRED US TO CLB TO 8500 FT. AT ABOUT THE SAME TIME WE RECEIVED THIS CLRNC WE GOT A TCASII RA TO DSND. WE FOLLOWED THE TCASII RA TO ABOUT 7200 FT WHERE WE RECEIVED A CLR OF CONFLICT AND STARTED A CLB BACK TO OUR LAST ASSIGNED ALT OF 8500 FT. WE ADVISED ATC OF THE TCASII RA WHEN IT OCCURRED AND RECEIVED ANOTHER CLRNC SHORTLY THEREAFTER TO DSND PLT'S DISCRETION TO 5000 FT. THE TCASII RA WAS CAUSED BY A GA BONANZA AT 8000 FT AT ABOUT OUR 3 O'CLOCK POS.
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.