Air carrier X TCASII TA with military fgt possible less than standard separation. Pilot deviation.

Attributes
ACN	246005
Time
Date	199307
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bld
State Reference	NV
Altitude	msl bound lower : 29000 msl bound upper : 29000
Aircraft 1
Controlling Facilities	artcc : zla tracon : oak
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Fighter
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 110 flight time total : 7000 flight time type : 1050
ASRS Report	246005
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 18000 flight time type : 2000
ASRS Report	246006
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 2500 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X while in cruise at FL290 5-10 mi northeast of bld VOR, a military fgt passed approximately 200 ft above and 1500 ft to the left of our aircraft. Military fgt appeared to be in a slight climb, maneuvering to his right. Our TCASII issued a TA and showed the fgt altitude to be FL292. The TCASII also showed the target descending after passing, to FL280. ZLA said that the fgt had been tracked at FL280 for the last 150 mi. A passenger on board reported seeing a military jet at our altitude and then descending, approximately 400 yards left of our aircraft.

Original NASA ASRS Text

Title: ACR X TCASII TA WITH MIL FGT POSSIBLE LTSS. PLTDEV.

Narrative: ACR X WHILE IN CRUISE AT FL290 5-10 MI NE OF BLD VOR, A MIL FGT PASSED APPROX 200 FT ABOVE AND 1500 FT TO THE L OF OUR ACFT. MIL FGT APPEARED TO BE IN A SLIGHT CLB, MANEUVERING TO HIS R. OUR TCASII ISSUED A TA AND SHOWED THE FGT ALT TO BE FL292. THE TCASII ALSO SHOWED THE TARGET DSNDING AFTER PASSING, TO FL280. ZLA SAID THAT THE FGT HAD BEEN TRACKED AT FL280 FOR THE LAST 150 MI. A PAX ON BOARD RPTED SEEING A MIL JET AT OUR ALT AND THEN DSNDING, APPROX 400 YARDS L OF OUR ACFT.

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.