Air carrier X TCASII TA had less than standard separation from Y. System error.

Attributes
ACN	240817
Time
Date	199304
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : osa
State Reference	FO
Altitude	msl bound lower : 6000 msl bound upper : 6500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : osa
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 5300 flight time type : 3600
ASRS Report	240817
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X hnl-osa, in WX, with osaka approach control, on assigned heading of 270 degrees, cleared from 7000 ft to 5000 ft. Another controller (I assume a supervisor) loudly stated '...hold your present altitude and turn to heading 010 degrees.' at the same time he said this we were just passing 6600 ft. We leveled at 6500 ft and at the same time our TCASII gave us a 'traffic, traffic' and target appeared at our 2 O'clock position (-500 ft) on a converging course at 2 mi. In a telephone conversation the captain had with approach control after the flight, osa approach control supervisor was very apologetic and stated that an error had been made by approach control due to the 'high winds aloft which allowed the other aircraft to be in our close proximity.' prevention: the approach controllers have a radar scope and can see the impending problem -- we (pilots) are basically at their mercy and I'm sure that we would have gotten a TCASII advisory for traffic avoidance if the situation had been allowed to continue.

Original NASA ASRS Text

Title: ACR X TCASII TA HAD LTSS FROM Y. SYS ERROR.

Narrative: ACR X HNL-OSA, IN WX, WITH OSAKA APCH CTL, ON ASSIGNED HDG OF 270 DEGS, CLRED FROM 7000 FT TO 5000 FT. ANOTHER CTLR (I ASSUME A SUPVR) LOUDLY STATED '...HOLD YOUR PRESENT ALT AND TURN TO HDG 010 DEGS.' AT THE SAME TIME HE SAID THIS WE WERE JUST PASSING 6600 FT. WE LEVELED AT 6500 FT AND AT THE SAME TIME OUR TCASII GAVE US A 'TFC, TFC' AND TARGET APPEARED AT OUR 2 O'CLOCK POS (-500 FT) ON A CONVERGING COURSE AT 2 MI. IN A TELEPHONE CONVERSATION THE CAPT HAD WITH APCH CTL AFTER THE FLT, OSA APCH CTL SUPVR WAS VERY APOLOGETIC AND STATED THAT AN ERROR HAD BEEN MADE BY APCH CTL DUE TO THE 'HIGH WINDS ALOFT WHICH ALLOWED THE OTHER ACFT TO BE IN OUR CLOSE PROX.' PREVENTION: THE APCH CTLRS HAVE A RADAR SCOPE AND CAN SEE THE IMPENDING PROB -- WE (PLTS) ARE BASICALLY AT THEIR MERCY AND I'M SURE THAT WE WOULD HAVE GOTTEN A TCASII ADVISORY FOR TFC AVOIDANCE IF THE SIT HAD BEEN ALLOWED TO CONTINUE.

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.