HS125 at FL370 takes evasive action of a descending left turn in response to a TCAS RA.

Attributes
ACN	691454
Time
Date	200603
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : sav.vortac
State Reference	GA
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 15000 flight time type : 2000
ASRS Report	691454
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : published procedure
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 400
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X was cruising at FL370 on a direct clearance from crg VOR to sav VOR. The TCAS TA alert went off approximately 60 NM south of sav VOR directing our attention to a descending aircraft at our 1 O'clock position. As we visually scanned for the aircraft the RA alert occurred. A descending left turn was initiated and a clear of conflict message was received as we descended through approximately FL360. ATC initiated no communication before; during; or after. The other aircraft asked ATC about the aircraft that they saw. I idented us as aircraft X; and they idented themselves as air carrier Y. Air carrier Y did see our aircraft; but we never saw them. In response to air carrier Y's inquiry; ATC said they were 'starting a tape.' the problem arose from flawed ATC instructions to air carrier Y. The problem was discussed by us with a TCAS TA. Corrective action: hand flown descending turn by our aircraft.

Original NASA ASRS Text

Title: HS125 AT FL370 TAKES EVASIVE ACTION OF A DSNDING L TURN IN RESPONSE TO A TCAS RA.

Narrative: ACFT X WAS CRUISING AT FL370 ON A DIRECT CLRNC FROM CRG VOR TO SAV VOR. THE TCAS TA ALERT WENT OFF APPROX 60 NM S OF SAV VOR DIRECTING OUR ATTN TO A DSNDING ACFT AT OUR 1 O'CLOCK POS. AS WE VISUALLY SCANNED FOR THE ACFT THE RA ALERT OCCURRED. A DSNDING L TURN WAS INITIATED AND A CLR OF CONFLICT MESSAGE WAS RECEIVED AS WE DSNDED THROUGH APPROX FL360. ATC INITIATED NO COM BEFORE; DURING; OR AFTER. THE OTHER ACFT ASKED ATC ABOUT THE ACFT THAT THEY SAW. I IDENTED US AS ACFT X; AND THEY IDENTED THEMSELVES AS ACR Y. ACR Y DID SEE OUR ACFT; BUT WE NEVER SAW THEM. IN RESPONSE TO ACR Y'S INQUIRY; ATC SAID THEY WERE 'STARTING A TAPE.' THE PROB AROSE FROM FLAWED ATC INSTRUCTIONS TO ACR Y. THE PROB WAS DISCUSSED BY US WITH A TCAS TA. CORRECTIVE ACTION: HAND FLOWN DSNDING TURN BY OUR ACFT.

Data retrieved from NASA's ASRS site as of January 2009 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.