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Near midair collision between an unknown aircraft and an airline medium large transport on an 8 mi visual approach to phx. Air carrier was on tower frequency. Reporter gives credit for 'save' to TCASII. No TA.
| Attributes | |
| ACN | 379421 |
| Time | |
| Date | 199709 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : phx |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other descent : approach |
| Route In Use | approach : visual arrival other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 20000 flight time type : 5000 |
| ASRS Report | 379421 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac non adherence : far non adherence : published procedure other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Scheduled flight stl to phx at approximately XA00 local was cleared by tower for visual approach runway 26R phx. Approximately 8 NM out on final approach at 2500 AGL, TCASII alert to descend was announced. First officer was flying and initiated a descent. I was alerted to intruder at 8:30 O'clock position. I checked and acquired visual contact with intruder who was belly-up on collision course. I took control of the aircraft and initiated an aggressive right turn and climb away from the intruder. The intruder had crossed both runway 26L and runway 26R final approachs in an overshoot. In my opinion, the TCASII warning was a major factor in avoiding a midair collision.
Original NASA ASRS Text
Title: NMAC BTWN AN UNKNOWN ACFT AND AN AIRLINE MLG ON AN 8 MI VISUAL APCH TO PHX. ACR WAS ON TWR FREQ. RPTR GIVES CREDIT FOR 'SAVE' TO TCASII. NO TA.
Narrative: SCHEDULED FLT STL TO PHX AT APPROX XA00 LCL WAS CLRED BY TWR FOR VISUAL APCH RWY 26R PHX. APPROX 8 NM OUT ON FINAL APCH AT 2500 AGL, TCASII ALERT TO DSND WAS ANNOUNCED. FO WAS FLYING AND INITIATED A DSCNT. I WAS ALERTED TO INTRUDER AT 8:30 O'CLOCK POS. I CHKED AND ACQUIRED VISUAL CONTACT WITH INTRUDER WHO WAS BELLY-UP ON COLLISION COURSE. I TOOK CTL OF THE ACFT AND INITIATED AN AGGRESSIVE R TURN AND CLB AWAY FROM THE INTRUDER. THE INTRUDER HAD CROSSED BOTH RWY 26L AND RWY 26R FINAL APCHS IN AN OVERSHOOT. IN MY OPINION, THE TCASII WARNING WAS A MAJOR FACTOR IN AVOIDING A MIDAIR COLLISION.
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.