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An airline DC9-30 flight crew hqs an near midair collision with a C150 during a visual approach. They evade by using both TCASII and visual sighting.
| Attributes | |
| ACN | 428920 |
| Time | |
| Date | 199902 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : atw.tower |
| State Reference | WI |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : atw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna 150 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 8660 flight time type : 2100 |
| ASRS Report | 428920 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 3500 |
| ASRS Report | 428785 |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | atc equipment other atc equipment : brite radar aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Miss Distance | horizontal : 800 vertical : 100 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
While on a heading of 340 degrees, altitude 3000 ft to intercept runway 29 for a visual approach, the captain (PNF) called and told approach the airport was in sight. Green bay approach cleared us for a visual approach and directed us to switch to appleton tower. As he looked down to change frequency, the TCASII displayed a target at 12 O'clock less than 2 mi, same altitude. We immediately began searching and found the traffic (a C150) eastbound at 3000 ft. Simultaneously with our visual sighting, the captain commanded a left turn and the TCASII displayed a 'descend, descend, descend' RA. I immediately commenced a rapid descent while continuing the 30 degree angle of bank left turn. Lateral and vertical separation increased quickly. The TCASII RA ceased, and we continued for an uneventful visual approach and landing at appleton. We questioned atw tower who told us that the cessna was not talking (or squawking) to them or to green bay approach. Closest point of possible collision was less than 1/4 mi and 100 ft vertically.
Original NASA ASRS Text
Title: AN AIRLINE DC9-30 FLC HQS AN NMAC WITH A C150 DURING A VISUAL APCH. THEY EVADE BY USING BOTH TCASII AND VISUAL SIGHTING.
Narrative: WHILE ON A HDG OF 340 DEGS, ALT 3000 FT TO INTERCEPT RWY 29 FOR A VISUAL APCH, THE CAPT (PNF) CALLED AND TOLD APCH THE ARPT WAS IN SIGHT. GREEN BAY APCH CLRED US FOR A VISUAL APCH AND DIRECTED US TO SWITCH TO APPLETON TWR. AS HE LOOKED DOWN TO CHANGE FREQ, THE TCASII DISPLAYED A TARGET AT 12 O'CLOCK LESS THAN 2 MI, SAME ALT. WE IMMEDIATELY BEGAN SEARCHING AND FOUND THE TFC (A C150) EBOUND AT 3000 FT. SIMULTANEOUSLY WITH OUR VISUAL SIGHTING, THE CAPT COMMANDED A L TURN AND THE TCASII DISPLAYED A 'DSND, DSND, DSND' RA. I IMMEDIATELY COMMENCED A RAPID DSCNT WHILE CONTINUING THE 30 DEG ANGLE OF BANK L TURN. LATERAL AND VERT SEPARATION INCREASED QUICKLY. THE TCASII RA CEASED, AND WE CONTINUED FOR AN UNEVENTFUL VISUAL APCH AND LNDG AT APPLETON. WE QUESTIONED ATW TWR WHO TOLD US THAT THE CESSNA WAS NOT TALKING (OR SQUAWKING) TO THEM OR TO GREEN BAY APCH. CLOSEST POINT OF POSSIBLE COLLISION WAS LESS THAN 1/4 MI AND 100 FT VERTLY.
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.