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Air carrier X non adherence to ATC clearance had less than standard separation from fgt Y. Pilot deviation. TCASII RA evasive action taken. Unauthorized descent.
| Attributes | |
| ACN | 177776 |
| Time | |
| Date | 199105 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pdz |
| State Reference | CA |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Fighter |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 22 |
| ASRS Report | 177776 |
| Person 2 | |
| Affiliation | government : military |
| Function | flight crew : single pilot |
| Qualification | pilot : military |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
This is one case where TCAS could very well have caused a mid air collision, as it gave air carrier X instructions to descend into the fgt Y climbing under him.
Original NASA ASRS Text
Title: ACR X NON ADHERENCE TO ATC CLRNC HAD LTSS FROM FGT Y. PLTDEV. TCASII RA EVASIVE ACTION TAKEN. UNAUTH DSCNT.
Narrative: THIS IS ONE CASE WHERE TCAS COULD VERY WELL HAVE CAUSED A MID AIR COLLISION, AS IT GAVE ACR X INSTRUCTIONS TO DSND INTO THE FGT Y CLBING UNDER HIM.
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.