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During cruise climb, an medium large transport flight crew had difficulty maintaining visual separation with a commuter turboprop and experienced an near midair collision. ARTCC radar controller had cleared the flight to a higher altitude on a visual separation clearance.
| Attributes | |
| ACN | 326994 |
| Time | |
| Date | 199602 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : psp |
| State Reference | CA |
| Altitude | msl bound lower : 17000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : psp |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 25 flight time total : 10600 flight time type : 280 |
| ASRS Report | 326994 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : nmac non adherence other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
A near miss with a commuter airline turboprop occurred while climbing through 17000 ft to FL230. ATC cleared us to climb to FL230 and maintain visual separation with the traffic. PF continued climbing to FL230 and had visual contact with the turboprop but had difficulty determining the flight path of the turboprop due to the paint scheme of the commuter. 'PNF' turned off the RA (TCASII) mode and did not advise PF. The lack of any TCASII warnings influenced the 'PF' that the convergence angle was less than actual. Evasive pitch up action was taken. In the future I will keep TCASII in RA mode, and will not advise ATC of 'visual contact' until both pilots clearly see and have determined the flight path of traffic.
Original NASA ASRS Text
Title: DURING CRUISE CLB, AN MLG FLC HAD DIFFICULTY MAINTAINING VISUAL SEPARATION WITH A COMMUTER TURBOPROP AND EXPERIENCED AN NMAC. ARTCC RADAR CTLR HAD CLRED THE FLT TO A HIGHER ALT ON A VISUAL SEPARATION CLRNC.
Narrative: A NEAR MISS WITH A COMMUTER AIRLINE TURBOPROP OCCURRED WHILE CLBING THROUGH 17000 FT TO FL230. ATC CLRED US TO CLB TO FL230 AND MAINTAIN VISUAL SEPARATION WITH THE TFC. PF CONTINUED CLBING TO FL230 AND HAD VISUAL CONTACT WITH THE TURBOPROP BUT HAD DIFFICULTY DETERMINING THE FLT PATH OF THE TURBOPROP DUE TO THE PAINT SCHEME OF THE COMMUTER. 'PNF' TURNED OFF THE RA (TCASII) MODE AND DID NOT ADVISE PF. THE LACK OF ANY TCASII WARNINGS INFLUENCED THE 'PF' THAT THE CONVERGENCE ANGLE WAS LESS THAN ACTUAL. EVASIVE PITCH UP ACTION WAS TAKEN. IN THE FUTURE I WILL KEEP TCASII IN RA MODE, AND WILL NOT ADVISE ATC OF 'VISUAL CONTACT' UNTIL BOTH PLTS CLRLY SEE AND HAVE DETERMINED THE FLT PATH OF TFC.
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.