Air carrier medium large transport receives TCASII TA as ARTCC radar controller issued amended clearance to avoid potential conflict with another aircraft. Non detection of aircraft by center radar.

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Attributes
ACN	200652
Time
Date	199201
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : orf
State Reference	VA
Altitude	msl bound lower : 35000 msl bound upper : 36000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx tower : iad
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 12000
ASRS Report	200652
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Jax center, frequency 118.82. At FL370, cleared us to FL330 within 40 mi. Approximately 100 mi south of orf, northbound from mia- phl. Upon passing FL360, center says to me 'air carrier xy turn left immediately to 330 degrees, climb and maintain FL370.' I disconnected the autoplt, turned and climbed immediately. At the same time TCASII advised 'traffic, traffic.' I asked what happened? Center said 'sorry, computer glitch. The computer didn't see traffic at 350.'

Original NASA ASRS Text

Title: ACR MLG RECEIVES TCASII TA AS ARTCC RADAR CTLR ISSUED AMENDED CLRNC TO AVOID POTENTIAL CONFLICT WITH ANOTHER ACFT. NON DETECTION OF ACFT BY CENTER RADAR.

Narrative: JAX CENTER, FREQ 118.82. AT FL370, CLRED US TO FL330 WITHIN 40 MI. APPROX 100 MI S OF ORF, NBOUND FROM MIA- PHL. UPON PASSING FL360, CENTER SAYS TO ME 'ACR XY TURN L IMMEDIATELY TO 330 DEGS, CLB AND MAINTAIN FL370.' I DISCONNECTED THE AUTOPLT, TURNED AND CLBED IMMEDIATELY. AT THE SAME TIME TCASII ADVISED 'TFC, TFC.' I ASKED WHAT HAPPENED? CENTER SAID 'SORRY, COMPUTER GLITCH. THE COMPUTER DIDN'T SEE TFC AT 350.'

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.