DC9, cleared for approach to dtw runway 21L, takes action to avoid an SF34 turning inside the cleared DC9, while another DC9 initiates a maneuver to avoid the 2 maneuvering aircraft.

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Attributes
ACN	511807
Time
Date	200105
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	msl single value : 3000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d21.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d21.tracon
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 8000 flight time type : 2200
ASRS Report	511807
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7000 flight time type : 500
ASRS Report	512810
Events
Anomaly	altitude deviation : overshoot conflict : airborne critical non adherence : published procedure non adherence : required legal separation other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action flight crew : took evasive action
Miss Distance	horizontal : 2000 vertical : 500
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Vectored aircraft X too close behind traffic turning onto runway 21L final. Additional traffic turning to runway 21R final (DC9, aircraft Z). Got a TA on saab (aircraft Y) low and left. Started to move up and away as TA turned to RA. Got an immediate RA on DC9 runway 21R traffic up and right. Acquired both aircraft visually. Maintained separation and requested landing on runway 21C. Landing was uneventful. We were sandwiched by ATC. The third aircraft was an air carrier Z DC9. They saw this situation grow and took evasive moves soonest. Supplemental information from acn 512810: when we (aircraft X) were clear of all maneuvering, we were 2 mi behind turboprop (aircraft Y) and closing on him. It was obvious that approach sandwiched us into an impossible situation. Delaying our clearance which caused us to threaten the approachs on runway 21R. We came no closer than 1 1/2 NM of any aircraft. All aircraft were in sight and no unusual or violent maneuvering was required.

Original NASA ASRS Text

Title: DC9, CLRED FOR APCH TO DTW RWY 21L, TAKES ACTION TO AVOID AN SF34 TURNING INSIDE THE CLRED DC9, WHILE ANOTHER DC9 INITIATES A MANEUVER TO AVOID THE 2 MANEUVERING ACFT.

Narrative: VECTORED ACFT X TOO CLOSE BEHIND TFC TURNING ONTO RWY 21L FINAL. ADDITIONAL TFC TURNING TO RWY 21R FINAL (DC9, ACFT Z). GOT A TA ON SAAB (ACFT Y) LOW AND L. STARTED TO MOVE UP AND AWAY AS TA TURNED TO RA. GOT AN IMMEDIATE RA ON DC9 RWY 21R TFC UP AND R. ACQUIRED BOTH ACFT VISUALLY. MAINTAINED SEPARATION AND REQUESTED LNDG ON RWY 21C. LNDG WAS UNEVENTFUL. WE WERE SANDWICHED BY ATC. THE THIRD ACFT WAS AN ACR Z DC9. THEY SAW THIS SIT GROW AND TOOK EVASIVE MOVES SOONEST. SUPPLEMENTAL INFO FROM ACN 512810: WHEN WE (ACFT X) WERE CLR OF ALL MANEUVERING, WE WERE 2 MI BEHIND TURBOPROP (ACFT Y) AND CLOSING ON HIM. IT WAS OBVIOUS THAT APCH SANDWICHED US INTO AN IMPOSSIBLE SIT. DELAYING OUR CLRNC WHICH CAUSED US TO THREATEN THE APCHS ON RWY 21R. WE CAME NO CLOSER THAN 1 1/2 NM OF ANY ACFT. ALL ACFT WERE IN SIGHT AND NO UNUSUAL OR VIOLENT MANEUVERING WAS REQUIRED.

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.