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Flight crew of an medium large transport aircraft took evasive action by climbing in response to a TCASII RA. Near midair collision caused by 3 helicopter aircraft crossing underneath the aircraft on final approach.
| Attributes | |
| ACN | 245761 |
| Time | |
| Date | 199307 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dca |
| State Reference | DC |
| Altitude | msl bound lower : 700 msl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dca |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Helicopter |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 12000 flight time type : 3000 |
| ASRS Report | 245761 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
During river visual approach dca (landing runway 18), 3 helicopters crossed our flight path. The first caused an RA on TCASII with a 0-300 ft climb (which we followed). The helicopter went directly under our aircraft with less than 300 ft separation. The next 2 helicopters caused monitor vertical descent on the TCASII. All 3 helicopters were encountered in a distance of less than 1 mi. The tower never called any traffic, until we called the first helicopter in sight. Then he said 3 helicopters were crossing the river. Without the RA we would have come even closer than 300 ft to the first helicopter.
Original NASA ASRS Text
Title: FLC OF AN MLG ACFT TOOK EVASIVE ACTION BY CLBING IN RESPONSE TO A TCASII RA. NMAC CAUSED BY 3 HELI ACFT XING UNDERNEATH THE ACFT ON FINAL APCH.
Narrative: DURING RIVER VISUAL APCH DCA (LNDG RWY 18), 3 HELIS CROSSED OUR FLT PATH. THE FIRST CAUSED AN RA ON TCASII WITH A 0-300 FT CLB (WHICH WE FOLLOWED). THE HELI WENT DIRECTLY UNDER OUR ACFT WITH LESS THAN 300 FT SEPARATION. THE NEXT 2 HELIS CAUSED MONITOR VERT DSCNT ON THE TCASII. ALL 3 HELIS WERE ENCOUNTERED IN A DISTANCE OF LESS THAN 1 MI. THE TWR NEVER CALLED ANY TFC, UNTIL WE CALLED THE FIRST HELI IN SIGHT. THEN HE SAID 3 HELIS WERE XING THE RIVER. WITHOUT THE RA WE WOULD HAVE COME EVEN CLOSER THAN 300 FT TO THE FIRST HELI.
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.