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A widebody transport air carrier crew had a TCASII alert demanding a descent while in the arrival pattern, and then another in the landing pattern. The first alert was for an near midair collision.
| Attributes | |
| ACN | 210264 |
| Time | |
| Date | 199205 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : btg airport : pdx |
| State Reference | WA |
| Altitude | agl bound lower : 10000 agl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse tracon : pdx |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other landing other |
| Route In Use | arrival other enroute airway : pdx |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 |
| ASRS Report | 210264 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe conflict : nmac non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On vectors into pdx level at 10000 ft and 250 KTS, TCASII alert said traffic, traffic! I was flying and looked for traffic in the direction TCASII indicated and could not see it. At that time TCASII went to warning mode and said 'descend, descend.' I immediately closed throttles, extended speed brakes and pushed nose over. A small single engine aircraft passed overhead about 400 ft above us. This traffic was never called out by center. A second TCASII alert changed to warning on short final caused by an aircraft in pattern at pearson airpark across the river. Pdx was landing to the east and they were in a west operation causing the conflict (this should not be allowed but continues to happen).
Original NASA ASRS Text
Title: A WDB ACR CREW HAD A TCASII ALERT DEMANDING A DSCNT WHILE IN THE ARR PATTERN, AND THEN ANOTHER IN THE LNDG PATTERN. THE FIRST ALERT WAS FOR AN NMAC.
Narrative: ON VECTORS INTO PDX LEVEL AT 10000 FT AND 250 KTS, TCASII ALERT SAID TFC, TFC! I WAS FLYING AND LOOKED FOR TFC IN THE DIRECTION TCASII INDICATED AND COULD NOT SEE IT. AT THAT TIME TCASII WENT TO WARNING MODE AND SAID 'DSND, DSND.' I IMMEDIATELY CLOSED THROTTLES, EXTENDED SPD BRAKES AND PUSHED NOSE OVER. A SMALL SINGLE ENG ACFT PASSED OVERHEAD ABOUT 400 FT ABOVE US. THIS TFC WAS NEVER CALLED OUT BY CTR. A SECOND TCASII ALERT CHANGED TO WARNING ON SHORT FINAL CAUSED BY AN ACFT IN PATTERN AT PEARSON AIRPARK ACROSS THE RIVER. PDX WAS LNDG TO THE E AND THEY WERE IN A W OP CAUSING THE CONFLICT (THIS SHOULD NOT BE ALLOWED BUT CONTINUES TO HAPPEN).
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.