Multiple runway operation parallel ILS approachs. Air carrier X had less than standard separation fr...

Attributes
ACN	257722
Time
Date	199311
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dxo
State Reference	MI
Altitude	msl bound lower : 4300 msl bound upper : 4300
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 3 controller radar : 5
ASRS Report	257722
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	257723
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	faa : investigated
Miss Distance	horizontal : 9000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

I was working runway 3L final approach course, I let the other controller know I was next for the approach during staggered turn- ONS, and advised what altitude I had air carrier X descending to 3000 ft. The other controller was to follow and turned air carrier Y too early to join the parallel approach course. The supervisor in charge came over and said it isn't going to work. He directed me to stop descent on my air carrier X. I complied with his verbal command and told air carrier X to stop descent and turn left heading 300. Air carrier X acknowledged and executed. I reiterated the turn and the crew acknowledged again that they were in the turn. Conflict alert activated. Supplemental information from acn 257723: I was vectoring towards the runway 3R final staying either 3 mi or 1000 ft from aircraft on vectors to runway 3L. I observed the aircraft on final runway 3L still at 5000 ft and I was at 4000 ft heading 270. I turned toward the final and descended expecting to remain at least 1000 ft below. My air carrier Y didn't descend and the other air carrier X did and we lost vertical separation. I had previously prompted my air carrier Y to expect a tight turn to final, so apparently he turned as requested without starting a descent. Supplemental information from acn 257726: air carrier Y on a base leg on approach to runway 3R at dtw. There were approachs also to runway 3L being made. There was some confusion with aircraft that were ahead of us. During this time we were on a 330 degree heading and were given a late turn on to final. Controller gave us an immediate turn to 090 degrees when TCASII went off. We got an RA to descend at 500 FPM. First officer (flying) pushed aircraft over 1000 FPM, and we got a new RA to climb. We were IMC, so I do not know how close the conflict was. The whole situation appeared to me that the controller was tired, could have been the end of his shift, and that he was trying to expedite too many airplanes.

Original NASA ASRS Text

Title: MULTIPLE RWY OP PARALLEL ILS APCHS. ACR X HAD LTSS FROM ACR Y TCASII RA EVASIVE ACTION TAKEN. SYS ERROR.

Narrative: I WAS WORKING RWY 3L FINAL APCH COURSE, I LET THE OTHER CTLR KNOW I WAS NEXT FOR THE APCH DURING STAGGERED TURN- ONS, AND ADVISED WHAT ALT I HAD ACR X DSNDING TO 3000 FT. THE OTHER CTLR WAS TO FOLLOW AND TURNED ACR Y TOO EARLY TO JOIN THE PARALLEL APCH COURSE. THE SUPVR IN CHARGE CAME OVER AND SAID IT ISN'T GOING TO WORK. HE DIRECTED ME TO STOP DSCNT ON MY ACR X. I COMPLIED WITH HIS VERBAL COMMAND AND TOLD ACR X TO STOP DSCNT AND TURN L HDG 300. ACR X ACKNOWLEDGED AND EXECUTED. I REITERATED THE TURN AND THE CREW ACKNOWLEDGED AGAIN THAT THEY WERE IN THE TURN. CONFLICT ALERT ACTIVATED. SUPPLEMENTAL INFO FROM ACN 257723: I WAS VECTORING TOWARDS THE RWY 3R FINAL STAYING EITHER 3 MI OR 1000 FT FROM ACFT ON VECTORS TO RWY 3L. I OBSERVED THE ACFT ON FINAL RWY 3L STILL AT 5000 FT AND I WAS AT 4000 FT HDG 270. I TURNED TOWARD THE FINAL AND DSNDED EXPECTING TO REMAIN AT LEAST 1000 FT BELOW. MY ACR Y DIDN'T DSND AND THE OTHER ACR X DID AND WE LOST VERT SEPARATION. I HAD PREVIOUSLY PROMPTED MY ACR Y TO EXPECT A TIGHT TURN TO FINAL, SO APPARENTLY HE TURNED AS REQUESTED WITHOUT STARTING A DSCNT. SUPPLEMENTAL INFO FROM ACN 257726: ACR Y ON A BASE LEG ON APCH TO RWY 3R AT DTW. THERE WERE APCHS ALSO TO RWY 3L BEING MADE. THERE WAS SOME CONFUSION WITH ACFT THAT WERE AHEAD OF US. DURING THIS TIME WE WERE ON A 330 DEG HDG AND WERE GIVEN A LATE TURN ON TO FINAL. CTLR GAVE US AN IMMEDIATE TURN TO 090 DEGS WHEN TCASII WENT OFF. WE GOT AN RA TO DSND AT 500 FPM. FO (FLYING) PUSHED ACFT OVER 1000 FPM, AND WE GOT A NEW RA TO CLB. WE WERE IMC, SO I DO NOT KNOW HOW CLOSE THE CONFLICT WAS. THE WHOLE SIT APPEARED TO ME THAT THE CTLR WAS TIRED, COULD HAVE BEEN THE END OF HIS SHIFT, AND THAT HE WAS TRYING TO EXPEDITE TOO MANY AIRPLANES.

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.

Multiple runway operation parallel ILS approachs. Air carrier X had less than standard separation from air carrier Y TCASII RA evasive action taken. System error.