B767 crew had TCASII RA from a malfunctioning TCASII system.

Attributes
ACN	513702
Time
Date	200106
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : vhp.vortac
State Reference	IN
Altitude	msl bound lower : 31000 msl bound upper : 31200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 17300 flight time type : 2700
ASRS Report	513702
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	other
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : repair performance deficiency : testing performance deficiency : fault isolation
Supplementary
Problem Areas	Aircraft Company Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

Descending to FL310 at FL312 we got a pop up RA. I followed TCASII guidance to 30750 ft staying out of the red pitch avoidance area. The target showed the same altitude and 1/2 mi ahead but climbing. We could see no other traffic and ATC said there was no traffic within 10 mi of our position. I switched TCASII off and returned VMC to FL310. At FL310 we tried TCASII again with the same result. We left TCASII off and made a logbook write-up. Aircraft had a previous history of TCASII problems.

Original NASA ASRS Text

Title: B767 CREW HAD TCASII RA FROM A MALFUNCTIONING TCASII SYS.

Narrative: DSNDING TO FL310 AT FL312 WE GOT A POP UP RA. I FOLLOWED TCASII GUIDANCE TO 30750 FT STAYING OUT OF THE RED PITCH AVOIDANCE AREA. THE TARGET SHOWED THE SAME ALT AND 1/2 MI AHEAD BUT CLBING. WE COULD SEE NO OTHER TFC AND ATC SAID THERE WAS NO TFC WITHIN 10 MI OF OUR POS. I SWITCHED TCASII OFF AND RETURNED VMC TO FL310. AT FL310 WE TRIED TCASII AGAIN WITH THE SAME RESULT. WE LEFT TCASII OFF AND MADE A LOGBOOK WRITE-UP. ACFT HAD A PREVIOUS HISTORY OF TCASII PROBS.

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.