 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
First officer of a corporate jet reported they were vectored directly over traffic that was 400 ft below them; resulting in an RA.
| Attributes | |
| ACN | 1008012 |
| Time | |
| Date | 201205 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | DAL.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Gulfstream Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors SID KING7 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | Descent |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Commercial Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 4100 Flight Crew Type 400 |
| Events | |
| Anomaly | ATC Issue All Types Conflict NMAC |
| Miss Distance | Horizontal 0 Vertical 400 |
Narrative:
After takeoff dal 13L; turned [to] 250 at 4;000 ft; 220 KTS. (Clearance was KING7.mqp; 4;000 ft; expect 10;000 in 10 minutes) ATC advised of an aircraft at our 1 o'clock; descending. TCAS showed it was 5 miles on a route east of us at -400 and descending. Since there were layers we could not establish visual contact. While it seemed the aircraft was about to pass on our right according to the TCAS; ATC directed us to turn 270. This turn took us exactly above the aircraft; and within a few seconds of the turn (even before getting to 270) we got 'traffic' and then 'climb; climb'. Pilot flying [took] actions according to flight director and we climbed to 4;500 ft. We transmitted 'RA event climbing' and after conflict was over we resumed 4;000 ft and advised 'resuming altitude'. The controller prematurely commanded a turn when vertical separation was too low. It is not clear if the other aircraft was descending at all or lingering at 3;600 ft. Though it was apparent that the turn could bring us close to the aircraft; due to the airspace class and traffic density we did not delay our reaction to the [clearance] as we saw that the other aircraft was descending on the TCAS.
Original NASA ASRS Text
Title: First Officer of a corporate jet reported they were vectored directly over traffic that was 400 FT below them; resulting in an RA.
Narrative: After takeoff DAL 13L; turned [to] 250 at 4;000 FT; 220 KTS. (Clearance was KING7.MQP; 4;000 FT; expect 10;000 in 10 minutes) ATC advised of an aircraft at our 1 o'clock; descending. TCAS showed it was 5 miles on a route east of us at -400 and descending. Since there were layers we could not establish visual contact. While it seemed the aircraft was about to pass on our right according to the TCAS; ATC directed us to turn 270. This turn took us exactly above the aircraft; and within a few seconds of the turn (even before getting to 270) we got 'Traffic' and then 'Climb; Climb'. Pilot flying [took] actions according to flight director and we climbed to 4;500 FT. We transmitted 'RA event climbing' and after conflict was over we resumed 4;000 FT and advised 'resuming altitude'. The Controller prematurely commanded a turn when vertical separation was too low. It is not clear if the other aircraft was descending at all or lingering at 3;600 FT. Though it was apparent that the turn could bring us close to the aircraft; due to the airspace class and traffic density we did not delay our reaction to the [clearance] as we saw that the other aircraft was descending on the TCAS.
Data retrieved from NASA's ASRS site as of July 2013 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.