Medium large transport given TA. Has traffic on TCASII but not sighted. TCASII fails, request vector from traffic. Vector not enough, TCASII back on gives RA.

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Attributes
ACN	233646
Time
Date	199302
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ctf
State Reference	SC
Altitude	msl bound lower : 16000 msl bound upper : 16900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors enroute airway : ztl
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 14000 flight time type : 8000
ASRS Report	233646
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were in level cruise at 16000 ft. ATC called VFR traffic at 2 O'clock and climbing. We had target on TCASII. TCASII quit momentarily, we then asked ATC for a vector to avoid traffic if it got close. We were issued a turn. TCASII then started working again and gave a climb command. We advised ATC of climb due to TCASII and climbed to 16900 ft. We then returned to 16000 ft after clear of conflict.

Original NASA ASRS Text

Title: MLG GIVEN TA. HAS TFC ON TCASII BUT NOT SIGHTED. TCASII FAILS, REQUEST VECTOR FROM TFC. VECTOR NOT ENOUGH, TCASII BACK ON GIVES RA.

Narrative: WE WERE IN LEVEL CRUISE AT 16000 FT. ATC CALLED VFR TFC AT 2 O'CLOCK AND CLBING. WE HAD TARGET ON TCASII. TCASII QUIT MOMENTARILY, WE THEN ASKED ATC FOR A VECTOR TO AVOID TFC IF IT GOT CLOSE. WE WERE ISSUED A TURN. TCASII THEN STARTED WORKING AGAIN AND GAVE A CLB COMMAND. WE ADVISED ATC OF CLB DUE TO TCASII AND CLBED TO 16900 FT. WE THEN RETURNED TO 16000 FT AFTER CLR OF CONFLICT.

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.