TCASII event. - NASA ASRS

Attributes
ACN	476344
Time
Date	200006
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : adena
State Reference	NC
Altitude	msl single value : 12000
Environment
Flight Conditions	VMC
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt.tracon
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival other arrival star : unarm
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : clt.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	476344
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
ASRS Report	476336
Events
Anomaly	conflict : airborne less severe inflight encounter : weather non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllerb other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : took evasive action
Miss Distance	vertical : 1500
Supplementary
Problem Areas	ATC Human Performance Weather
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure

Narrative:

Near adena intersection unarm arrival clt. We were on the unarm arrival to clt. We were tracking to the west of the arrival radial due to a line of thunderstorms of the arrival track. ZTL cleared us to 12000 ft. Upon reaching 12000 ft we were at 250 KTS west of the course in the vicinity of adena intersection. ZTL had approved our deviation. As we leveled off, ZTL handed us off to clt approach. Clt approach responded to our check-in by stating he did not know why we were there and at 12000 ft. He said there was opposite direction traffic at 12000 ft. He then told us to turn to a 150 degree heading. We told him we were unable due to the thunderstorm. He once again informed us of the traffic. I picked him up visually at about the same time he appeared on the TCASII. Approach told us to turn. I began a turn to the left at the same time the TCASII gave us a descend command. I initiated a descent and continued the turn. The traffic passed over us by about 1500 ft. Once clear, it took a couple of calls to approach to receive further clearance to the approach. Landing was uneventful.

Original NASA ASRS Text

Title: TCASII EVENT.

Narrative: NEAR ADENA INTXN UNARM ARR CLT. WE WERE ON THE UNARM ARR TO CLT. WE WERE TRACKING TO THE W OF THE ARR RADIAL DUE TO A LINE OF TSTMS OF THE ARR TRACK. ZTL CLRED US TO 12000 FT. UPON REACHING 12000 FT WE WERE AT 250 KTS W OF THE COURSE IN THE VICINITY OF ADENA INTXN. ZTL HAD APPROVED OUR DEV. AS WE LEVELED OFF, ZTL HANDED US OFF TO CLT APCH. CLT APCH RESPONDED TO OUR CHK-IN BY STATING HE DID NOT KNOW WHY WE WERE THERE AND AT 12000 FT. HE SAID THERE WAS OPPOSITE DIRECTION TFC AT 12000 FT. HE THEN TOLD US TO TURN TO A 150 DEG HDG. WE TOLD HIM WE WERE UNABLE DUE TO THE TSTM. HE ONCE AGAIN INFORMED US OF THE TFC. I PICKED HIM UP VISUALLY AT ABOUT THE SAME TIME HE APPEARED ON THE TCASII. APCH TOLD US TO TURN. I BEGAN A TURN TO THE L AT THE SAME TIME THE TCASII GAVE US A DSND COMMAND. I INITIATED A DSCNT AND CONTINUED THE TURN. THE TFC PASSED OVER US BY ABOUT 1500 FT. ONCE CLR, IT TOOK A COUPLE OF CALLS TO APCH TO RECEIVE FURTHER CLRNC TO THE APCH. LNDG WAS UNEVENTFUL.

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.