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An air carrier captain reported an near midair collision with a general aviation aircraft on approach to iad. ATC was unaware of the GA aircraft; and TCAS failed to issue a TA or RA.
| Attributes | |
| ACN | 918571 |
| Time | |
| Date | 201011 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | PCT.TRACON |
| State Reference | VA |
| Aircraft 1 | |
| Make Model Name | Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 90 Flight Crew Total 20000 Flight Crew Type 9000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Conflict NMAC |
| Miss Distance | Horizontal 0 Vertical 200 |
Narrative:
Near miss! - We were vectored for left base entry to 01C into dulles and given 5000 ft and heading of 160. While flying on that heading we noticed an aircraft strobe light at our 1 o'clock position; first officer was flying with autopilot on. TCAS displayed a white target on nd but no verbal commands and no TA/RA. ATC did not advise of traffic either. As we continued on the 160 heading it became very clear that we where on a collision path with the other aircraft. The first officer disconnected the autopilot and descended to about 4800 ft and the small general aviation aircraft flew directly over our nose/cockpit about 200-300 ft above us! I quickly advised ATC that we deviated altitude and advised of conflicting traffic. ATC replied that they did not have them and they would monitor radar for airplane. We made a maintenance log write up for TCAS not properly alerting us with a TA/RA.
Original NASA ASRS Text
Title: An air carrier Captain reported an NMAC with a general aviation aircraft on approach to IAD. ATC was unaware of the GA aircraft; and TCAS failed to issue a TA or RA.
Narrative: Near miss! - We were vectored for left base entry to 01C into Dulles and given 5000 FT and heading of 160. While flying on that heading we noticed an aircraft strobe light at our 1 o'clock position; First Officer was flying with autopilot on. TCAS displayed a white target on ND but no verbal commands and no TA/RA. ATC did not advise of traffic either. As we continued on the 160 heading it became very clear that we where on a collision path with the other aircraft. The First Officer disconnected the autopilot and descended to about 4800 FT and the small general aviation aircraft flew directly over our nose/cockpit about 200-300 FT above us! I quickly advised ATC that we deviated altitude and advised of conflicting traffic. ATC replied that they did not have them and they would monitor radar for airplane. We made a maintenance log write up for TCAS not properly alerting us with a TA/RA.
Data retrieved from NASA's ASRS site as of April 2012 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.