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Corporate jet first officer reported a near midair collision 15 NM southwest of ttn with a general aviation aircraft.
| Attributes | |
| ACN | 1467200 |
| Time | |
| Date | 201707 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | PHL.TRACON |
| State Reference | PA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Vectors Direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 30 Flight Crew Total 7300 Flight Crew Type 60 |
| Events | |
| Anomaly | ATC Issue All Types Conflict NMAC |
| Miss Distance | Vertical 200 |
Narrative:
During arrival into ttn; weather cavok; approximately 15 miles southwest of ttn at 4;000 feet MSL we received a TCAS traffic alert followed several seconds later (less than 5 seconds) by a TCAS 'descend' RA. The traffic was a single engine aircraft that initially indicated on our TCAS approximately 100 feet above our 12 o'clock position and less than 3 miles. Estimate our aircraft missed the single engine traffic by approximately 200-300 feet. Pilot flying successfully maneuvered aircraft in response to RA; and pilot not flying acquired traffic visually during TCAS RA response maneuver. ATC (phl approach) did not alert us to traffic until execution of RA response; and pilot not flying subsequently reported the RA to ATC. Causal factors contributing to hazard incident include late ATC traffic advisory; and the short time interval between the TCAS traffic alert and resolution advisory. Suggest a review be conducted of the ATC radar during the incident to help identify additional contributing factors and determination of root cause(s).
Original NASA ASRS Text
Title: Corporate jet First Officer reported a NMAC 15 NM southwest of TTN with a general aviation aircraft.
Narrative: During arrival into TTN; weather CAVOK; approximately 15 miles southwest of TTN at 4;000 feet MSL we received a TCAS traffic alert followed several seconds later (less than 5 seconds) by a TCAS 'descend' RA. The traffic was a single engine aircraft that initially indicated on our TCAS approximately 100 feet above our 12 o'clock position and less than 3 miles. Estimate our aircraft missed the single engine traffic by approximately 200-300 feet. Pilot flying successfully maneuvered aircraft in response to RA; and pilot not flying acquired traffic visually during TCAS RA response maneuver. ATC (PHL Approach) did not alert us to traffic until execution of RA response; and pilot not flying subsequently reported the RA to ATC. Causal factors contributing to hazard incident include late ATC traffic advisory; and the short time interval between the TCAS traffic alert and Resolution Advisory. Suggest a review be conducted of the ATC radar during the incident to help identify additional contributing factors and determination of root cause(s).
Data retrieved from NASA's ASRS site 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.