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.

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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.