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Flight crew of large transport stopped climbing and leveled off in response to a TCASII RA. ATC controller subsequently gave a turn to additionally separate the 2 aircraft.
| Attributes | |
| ACN | 270700 |
| Time | |
| Date | 199405 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iad |
| State Reference | VA |
| Altitude | msl bound lower : 11000 msl bound upper : 11500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : private |
| Experience | flight time last 90 days : 200 flight time total : 4000 flight time type : 2500 |
| ASRS Report | 270700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 24000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Flight departed iad en route to sju. While on a vector and climbing through 10500 for 12000 ft, the TCASII showed a potential target directly ahead at 5 mi and closing. We notified washington departure of the conflict and leveled at 11000 ft. The traffic at this point was 12 O'clock, 4 mi and 400 ft above us. The controller gave us an immediate 20 degree left turn and told us to maintain 11000 ft. He then apologized for being temporarily distracted. I am fully convinced that had TCASII not been installed on the aircraft, a midair collision could have resulted.
Original NASA ASRS Text
Title: FLC OF LGT STOPPED CLBING AND LEVELED OFF IN RESPONSE TO A TCASII RA. ATC CTLR SUBSEQUENTLY GAVE A TURN TO ADDITIONALLY SEPARATE THE 2 ACFT.
Narrative: FLT DEPARTED IAD ENRTE TO SJU. WHILE ON A VECTOR AND CLBING THROUGH 10500 FOR 12000 FT, THE TCASII SHOWED A POTENTIAL TARGET DIRECTLY AHEAD AT 5 MI AND CLOSING. WE NOTIFIED WASHINGTON DEP OF THE CONFLICT AND LEVELED AT 11000 FT. THE TFC AT THIS POINT WAS 12 O'CLOCK, 4 MI AND 400 FT ABOVE US. THE CTLR GAVE US AN IMMEDIATE 20 DEG L TURN AND TOLD US TO MAINTAIN 11000 FT. HE THEN APOLOGIZED FOR BEING TEMPORARILY DISTRACTED. I AM FULLY CONVINCED THAT HAD TCASII NOT BEEN INSTALLED ON THE ACFT, A MIDAIR COLLISION COULD HAVE RESULTED.
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.