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B777 flight crew climbed in response to a TCASII RA caused by an unknown aircraft in a scramble for an intercept.
| Attributes | |
| ACN | 535640 |
| Time | |
| Date | 200201 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : hrv.vortac |
| State Reference | LA |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | other |
| Make Model Name | Fighter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 535640 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took precautionary avoidance action flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew other |
| Miss Distance | horizontal : 4000 vertical : 400 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure Pilot Deviation |
Narrative:
Sudden TCASII yellow box accompanied by traffic alert at less than 1 mi, then immediately followed by RA and instructions to climb. Target showed at 30600 ft, perhaps higher very briefly. We followed guidance, advised ZHU who seemed as alarmed as us. He told us to do what we needed, advised us there was a hot scramble in process, and attempted contact with the fighter, apparently on UHF, because we never heard the replies. We never saw the aircraft and probably only climbed 200-300 ft before returning to normal flight. We never saw him or heard more about him. ZHU apologized for nearness, and led us to understand that he did not have him until we called about him. No injuries encountered while avoiding.
Original NASA ASRS Text
Title: B777 FLC CLBED IN RESPONSE TO A TCASII RA CAUSED BY AN UNKNOWN ACFT IN A SCRAMBLE FOR AN INTERCEPT.
Narrative: SUDDEN TCASII YELLOW BOX ACCOMPANIED BY TFC ALERT AT LESS THAN 1 MI, THEN IMMEDIATELY FOLLOWED BY RA AND INSTRUCTIONS TO CLB. TARGET SHOWED AT 30600 FT, PERHAPS HIGHER VERY BRIEFLY. WE FOLLOWED GUIDANCE, ADVISED ZHU WHO SEEMED AS ALARMED AS US. HE TOLD US TO DO WHAT WE NEEDED, ADVISED US THERE WAS A HOT SCRAMBLE IN PROCESS, AND ATTEMPTED CONTACT WITH THE FIGHTER, APPARENTLY ON UHF, BECAUSE WE NEVER HEARD THE REPLIES. WE NEVER SAW THE ACFT AND PROBABLY ONLY CLBED 200-300 FT BEFORE RETURNING TO NORMAL FLT. WE NEVER SAW HIM OR HEARD MORE ABOUT HIM. ZHU APOLOGIZED FOR NEARNESS, AND LED US TO UNDERSTAND THAT HE DID NOT HAVE HIM UNTIL WE CALLED ABOUT HIM. NO INJURIES ENCOUNTERED WHILE AVOIDING.
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.