Flight crew of air carrier medium large transport aircraft took evasive action in response to a TCASII RA resulting in deviation from assigned altitude.

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Attributes
ACN	240941
Time
Date	199305
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : spa
State Reference	SC
Altitude	msl bound lower : 32400 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 11500 flight time type : 1000
ASRS Report	240941
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During cruise at FL330, 75 mi south of spa VOR, TCASII voice announced traffic, followed by descend, traffic, descend. Began descent, traffic observed on TCASII at 1-2 O'clock and 2 mi (red square plus 1400 ft) and plus 1400 ft. TCASII said monitor vertical speed and we leveled at 32400 ft. Advised ZTL on the RA and returned to FL330. Atl advised us that there was no traffic above us in that direction, only traffic at 2 O'clock at FL290 which was visually observed and traffic at 10 O'clock and FL350. We did not visually spot the traffic giving us the RA. May have been a false advisory. TCASII did not announce clear of conflict as it is supposed to do. TCASII appeared to work normally the rest of the flight. Performed TCASII test again and passed the test. ZTL said there was no traffic in that area. Filed TCASII incident form with the company.

Original NASA ASRS Text

Title: FLC OF ACR MLG ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA RESULTING IN DEV FROM ASSIGNED ALT.

Narrative: DURING CRUISE AT FL330, 75 MI S OF SPA VOR, TCASII VOICE ANNOUNCED TFC, FOLLOWED BY DSND, TFC, DSND. BEGAN DSCNT, TFC OBSERVED ON TCASII AT 1-2 O'CLOCK AND 2 MI (RED SQUARE PLUS 1400 FT) AND PLUS 1400 FT. TCASII SAID MONITOR VERT SPD AND WE LEVELED AT 32400 FT. ADVISED ZTL ON THE RA AND RETURNED TO FL330. ATL ADVISED US THAT THERE WAS NO TFC ABOVE US IN THAT DIRECTION, ONLY TFC AT 2 O'CLOCK AT FL290 WHICH WAS VISUALLY OBSERVED AND TFC AT 10 O'CLOCK AND FL350. WE DID NOT VISUALLY SPOT THE TFC GIVING US THE RA. MAY HAVE BEEN A FALSE ADVISORY. TCASII DID NOT ANNOUNCE CLR OF CONFLICT AS IT IS SUPPOSED TO DO. TCASII APPEARED TO WORK NORMALLY THE REST OF THE FLT. PERFORMED TCASII TEST AGAIN AND PASSED THE TEST. ZTL SAID THERE WAS NO TFC IN THAT AREA. FILED TCASII INCIDENT FORM WITH THE COMPANY.

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.