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Potential conflict between a departure air carrier B737 and an inbound VFR C152 southwest of thomm intersection near phx, az.
| Attributes | |
| ACN | 571642 |
| Time | |
| Date | 200301 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : thomm |
| State Reference | AZ |
| Altitude | msl bound lower : 10000 msl bound upper : 10200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : silow 1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Cessna 152 |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 140 flight time total : 11000 flight time type : 2200 |
| ASRS Report | 571642 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude flight crew : took evasive action |
| Miss Distance | horizontal : 3000 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft Airspace Structure Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Departing phx on the silow 1 departure, ATC assigned us 10000 ft and cleared us direct to the thomm intersection. Shortly thereafter, ATC called traffic at 2 O'clock position, VFR at 10500 ft. Both the first officer and myself spotted the traffic. The first officer called ATC and reported 'traffic in sight' 20-30 seconds later, we received a TCASII warning followed by a TCASII RA. I complied with the vsi indication until I heard 'clear of conflict.' maximum altitude deviation was 200 ft (10000 ft to 9800 ft). I then climbed back to the assigned altitude of 10000 ft.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT BTWN A DEP ACR B737 AND AN INBOUND VFR C152 SW OF THOMM INTXN NEAR PHX, AZ.
Narrative: DEPARTING PHX ON THE SILOW 1 DEP, ATC ASSIGNED US 10000 FT AND CLRED US DIRECT TO THE THOMM INTXN. SHORTLY THEREAFTER, ATC CALLED TFC AT 2 O'CLOCK POS, VFR AT 10500 FT. BOTH THE FO AND MYSELF SPOTTED THE TFC. THE FO CALLED ATC AND RPTED 'TFC IN SIGHT' 20-30 SECONDS LATER, WE RECEIVED A TCASII WARNING FOLLOWED BY A TCASII RA. I COMPLIED WITH THE VSI INDICATION UNTIL I HEARD 'CLR OF CONFLICT.' MAX ALTDEV WAS 200 FT (10000 FT TO 9800 FT). I THEN CLBED BACK TO THE ASSIGNED ALT OF 10000 FT.
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.