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An air carrier B737 on visual approach to psc given traffic information by approach control on an small aircraft, the B737 saw it visually and moments later received a TCASII RA. The air carrier flight crew disregarded the TCASII RA and then spotted another small aircraft in an evasive action maneuver approximately 300 ft away.
| Attributes | |
| ACN | 386462 |
| Time | |
| Date | 199711 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : psc |
| State Reference | WA |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : psc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Route In Use | approach : visual enroute airway : psc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 5000 flight time type : 900 |
| ASRS Report | 386462 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
On visual approach to psc descending through 5000 ft, chinook approach called traffic 1000 ft below at 11 O'clock. Visual contact made with small high wing aircraft. Moments later, TCASII advisory called 'traffic, traffic, monitor vertical speed' then 'climb, climb.' some hesitancy to climb because traffic was in sight at 2 mi away. Just then another aircraft (small biplane) was sighted making a hard turn away at 11 O'clock at 300 ft near miss. Slow reaction to TCASII and perception that the airplane in sight was the conflict led to near miss. Approach assumed that when called the traffic in sight that we saw the near one and did not call both. Moral: comply with TCASII.
Original NASA ASRS Text
Title: AN ACR B737 ON VISUAL APCH TO PSC GIVEN TFC INFO BY APCH CTL ON AN SMA, THE B737 SAW IT VISUALLY AND MOMENTS LATER RECEIVED A TCASII RA. THE ACR FLC DISREGARDED THE TCASII RA AND THEN SPOTTED ANOTHER SMA IN AN EVASIVE ACTION MANEUVER APPROX 300 FT AWAY.
Narrative: ON VISUAL APCH TO PSC DSNDING THROUGH 5000 FT, CHINOOK APCH CALLED TFC 1000 FT BELOW AT 11 O'CLOCK. VISUAL CONTACT MADE WITH SMALL HIGH WING ACFT. MOMENTS LATER, TCASII ADVISORY CALLED 'TFC, TFC, MONITOR VERT SPD' THEN 'CLB, CLB.' SOME HESITANCY TO CLB BECAUSE TFC WAS IN SIGHT AT 2 MI AWAY. JUST THEN ANOTHER ACFT (SMALL BIPLANE) WAS SIGHTED MAKING A HARD TURN AWAY AT 11 O'CLOCK AT 300 FT NEAR MISS. SLOW REACTION TO TCASII AND PERCEPTION THAT THE AIRPLANE IN SIGHT WAS THE CONFLICT LED TO NEAR MISS. APCH ASSUMED THAT WHEN CALLED THE TFC IN SIGHT THAT WE SAW THE NEAR ONE AND DID NOT CALL BOTH. MORAL: COMPLY WITH TCASII.
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.