 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737-700 flight crew takes evasive action, observing a small aircraft aircraft at the phx class B boundary as pso issues a TCASII conflict alert.
| Attributes | |
| ACN | 579204 |
| Time | |
| Date | 200304 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : phx.airport |
| State Reference | AZ |
| Altitude | msl single value : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : coyot |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : p50.tracon |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise : enroute altitude change cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 236 flight time total : 5000 flight time type : 3000 |
| ASRS Report | 579204 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 20000 |
| ASRS Report | 579203 |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued alert controller : issued new clearance controller : separated traffic flight crew : took evasive action other |
| Consequence | other |
| Miss Distance | horizontal : 1500 vertical : 200 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airspace Structure ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While descending into phx on the coyot 1 STAR, we had a TCASII RA and near miss with a light aircraft. We were 10 mi south of mahem/20 mi north of pxr, descending to 8000 ft. At 8200 ft, we got a TCASII TA showing the other aircraft 700 ft below us and approximately 4-5 mi in front of us at 12 O'clock. My first thought was he was a VFR aircraft at 7500 ft. I leveled while looking out the window for him. When I looked back at the TCASII display to check his position, I saw that he was climbing and now only 200 ft below us at about 2 mi on the nose. Now I was much more concerned. Next, the controller started giving us a TA call and, simultaneously, the captain and I started talking about a right turn to avoid him. After beginning the turn, we got a TCASII RA, 'monitor vertical speed.' it directed level to descent (ie, no climb). The TCASII display now showed the other aircraft 100 ft above us. By this time, the captain had a visual on him, a single engine, low-wing airplane. Captain stated he passed 200 ft above and 1/4-1/2 mi horizontal. I never gained a visual on the aircraft due to following TCASII RA. Captain also stated the other aircraft was in a hard turn away from us when he saw him. We deviated slightly west of course for the RA, then resumed the arrival. I was surprised at just how late the TCASII RA came.
Original NASA ASRS Text
Title: B737-700 FLT CREW TAKES EVASIVE ACTION, OBSERVING A SMA ACFT AT THE PHX CLASS B BOUNDARY AS PSO ISSUES A TCASII CONFLICT ALERT.
Narrative: WHILE DSNDING INTO PHX ON THE COYOT 1 STAR, WE HAD A TCASII RA AND NEAR MISS WITH A LIGHT ACFT. WE WERE 10 MI S OF MAHEM/20 MI N OF PXR, DSNDING TO 8000 FT. AT 8200 FT, WE GOT A TCASII TA SHOWING THE OTHER ACFT 700 FT BELOW US AND APPROX 4-5 MI IN FRONT OF US AT 12 O'CLOCK. MY FIRST THOUGHT WAS HE WAS A VFR ACFT AT 7500 FT. I LEVELED WHILE LOOKING OUT THE WINDOW FOR HIM. WHEN I LOOKED BACK AT THE TCASII DISPLAY TO CHK HIS POS, I SAW THAT HE WAS CLBING AND NOW ONLY 200 FT BELOW US AT ABOUT 2 MI ON THE NOSE. NOW I WAS MUCH MORE CONCERNED. NEXT, THE CTLR STARTED GIVING US A TA CALL AND, SIMULTANEOUSLY, THE CAPT AND I STARTED TALKING ABOUT A R TURN TO AVOID HIM. AFTER BEGINNING THE TURN, WE GOT A TCASII RA, 'MONITOR VERT SPD.' IT DIRECTED LEVEL TO DSCNT (IE, NO CLB). THE TCASII DISPLAY NOW SHOWED THE OTHER ACFT 100 FT ABOVE US. BY THIS TIME, THE CAPT HAD A VISUAL ON HIM, A SINGLE ENG, LOW-WING AIRPLANE. CAPT STATED HE PASSED 200 FT ABOVE AND 1/4-1/2 MI HORIZ. I NEVER GAINED A VISUAL ON THE ACFT DUE TO FOLLOWING TCASII RA. CAPT ALSO STATED THE OTHER ACFT WAS IN A HARD TURN AWAY FROM US WHEN HE SAW HIM. WE DEVIATED SLIGHTLY W OF COURSE FOR THE RA, THEN RESUMED THE ARR. I WAS SURPRISED AT JUST HOW LATE THE TCASII RA CAME.
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.