Medium large transport told to follow an medium large transport on a visual but weren't told which of 2 medium large transport's to follow. Followed wrong one triggering TCASII RA.

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Attributes
ACN	236509
Time
Date	199303
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cle
State Reference	OH
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cle tower : cle
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
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 : 9000 flight time type : 5000
ASRS Report	236509
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 16000 flight time type : 9000
ASRS Report	236576
Events
Anomaly	conflict : airborne less severe non adherence : far non adherence other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Descending into cle at 3000 ft on a right base leg to runway 23L approach control asked if we had the airport and/or if we had an medium large transport 11-12 O'clock position. Captain replied we had the airport and the medium large transport. We were then cleared for the visual approach to runway 23L behind the medium large transport and told to contact tower. Captain switched to tower and told them we were following the air carrier X medium large transport. Tower said the traffic we were following was an air carrier Y medium large transport, we then looked to the left and found them. Tower told us to turn to 050 degrees which we did. After about 1/2 of the turn, TCASII called for a descent which we did and when clear, we stopped the descent and tower then turned us to the airport and we continued the visual to runway 23L. When approach stated traffic was at 11-12 O'clock, that is where air carrier X was exactly and air carrier Y we did not see at that time. They also did not state an airline type which when approach has 2 medium large transport's following one another, I believe should have been done or at least made us aware of the fact that there were 2 medium large transport's to watch for. I believe approach called the traffic in the wrong position for us to follow or just didn't gauge air carrier Y position from us accurately.

Original NASA ASRS Text

Title: MLG TOLD TO FOLLOW AN MLG ON A VISUAL BUT WEREN'T TOLD WHICH OF 2 MLG'S TO FOLLOW. FOLLOWED WRONG ONE TRIGGERING TCASII RA.

Narrative: DSNDING INTO CLE AT 3000 FT ON A R BASE LEG TO RWY 23L APCH CTL ASKED IF WE HAD THE ARPT AND/OR IF WE HAD AN MLG 11-12 O'CLOCK POS. CAPT REPLIED WE HAD THE ARPT AND THE MLG. WE WERE THEN CLRED FOR THE VISUAL APCH TO RWY 23L BEHIND THE MLG AND TOLD TO CONTACT TWR. CAPT SWITCHED TO TWR AND TOLD THEM WE WERE FOLLOWING THE ACR X MLG. TWR SAID THE TFC WE WERE FOLLOWING WAS AN ACR Y MLG, WE THEN LOOKED TO THE L AND FOUND THEM. TWR TOLD US TO TURN TO 050 DEGS WHICH WE DID. AFTER ABOUT 1/2 OF THE TURN, TCASII CALLED FOR A DSCNT WHICH WE DID AND WHEN CLR, WE STOPPED THE DSCNT AND TWR THEN TURNED US TO THE ARPT AND WE CONTINUED THE VISUAL TO RWY 23L. WHEN APCH STATED TFC WAS AT 11-12 O'CLOCK, THAT IS WHERE ACR X WAS EXACTLY AND ACR Y WE DID NOT SEE AT THAT TIME. THEY ALSO DID NOT STATE AN AIRLINE TYPE WHICH WHEN APCH HAS 2 MLG'S FOLLOWING ONE ANOTHER, I BELIEVE SHOULD HAVE BEEN DONE OR AT LEAST MADE US AWARE OF THE FACT THAT THERE WERE 2 MLG'S TO WATCH FOR. I BELIEVE APCH CALLED THE TFC IN THE WRONG POS FOR US TO FOLLOW OR JUST DIDN'T GAUGE ACR Y POS FROM US ACCURATELY.

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.