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Air carrier medium large transport, responding to TCAS evasive command, climbs instead of descends as instructed by ATC after climb initiated.
| Attributes | |
| ACN | 105352 |
| Time | |
| Date | 198902 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hdf |
| State Reference | CA |
| Altitude | msl bound lower : 13000 msl bound upper : 13800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 11000 flight time type : 5000 |
| ASRS Report | 105352 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Descending into sna with TCAS equipped medium large transport with a TCAS traffic advisory at 300', 3 mi at 2 O'clock and climbing. At 1 mi it changed to a traffic warning with a TCAS command to climb. As the traffic was visibility at this time we did initiate a 1500' rate of climb. At this time ATC called the traffic and said if we did not have the traffic visibility, to start an immediate descent. We leveled at 13800' and descended back to our assigned altitude of 13000' after the traffic passed below and behind us. The TCAS warning and commanded action turned out to be the correct one.
Original NASA ASRS Text
Title: ACR MLG, RESPONDING TO TCAS EVASIVE COMMAND, CLIMBS INSTEAD OF DESCENDS AS INSTRUCTED BY ATC AFTER CLIMB INITIATED.
Narrative: DSNDING INTO SNA WITH TCAS EQUIPPED MLG WITH A TCAS TFC ADVISORY AT 300', 3 MI AT 2 O'CLOCK AND CLBING. AT 1 MI IT CHANGED TO A TFC WARNING WITH A TCAS COMMAND TO CLB. AS THE TFC WAS VIS AT THIS TIME WE DID INITIATE A 1500' RATE OF CLB. AT THIS TIME ATC CALLED THE TFC AND SAID IF WE DID NOT HAVE THE TFC VIS, TO START AN IMMEDIATE DSCNT. WE LEVELED AT 13800' AND DSNDED BACK TO OUR ASSIGNED ALT OF 13000' AFTER THE TFC PASSED BELOW AND BEHIND US. THE TCAS WARNING AND COMMANDED ACTION TURNED OUT TO BE THE CORRECT ONE.
Data retrieved from NASA's ASRS site as of August 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.