<< >> NASA ASRS Report 528862, November 2001

B737-800 captain makes a 360 degree turn for spacing behind a saab 340 on final to the same runway. There were 2 TCASII RA's during the turn.

Attributes
ACN	528862
Time
Date	200111
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 2100
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : mdw.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Flight Phase	descent : approach
Aircraft 2
Controlling Facilities	tower : mdw.tower
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 9000 flight time type : 70
ASRS Report	528862
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action
Miss Distance	horizontal : 6000
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Cleared to circle (visual approach) runway 22L at mdw. Another (turboprop) aircraft was on final to runway 22L. I was on a base-to-final and the saab 340 was already on final. I was not cleared to land yet, but had to make a right 360 degree turn to avoid the saab and return to a final approach leg to the runway. I had a TCASII RA from the saab and then another RA during the 360 degree maneuver avoidance turn from other circling airplanes. Tower sequenced us too close. My speed was much greater than the saab and closure rate was misjudged by the chicago tower controller. All slower aft cleared to land at mdw airport should land on runway 22R, not runway 22L. Jet traffic and turboprops cannot share the visual circle to runway 22L due to speed differential.

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Original NASA ASRS Text

Title: B737-800 CAPT MAKES A 360 DEG TURN FOR SPACING BEHIND A SAAB 340 ON FINAL TO THE SAME RWY. THERE WERE 2 TCASII RA'S DURING THE TURN.

Narrative: CLRED TO CIRCLE (VISUAL APCH) RWY 22L AT MDW. ANOTHER (TURBOPROP) ACFT WAS ON FINAL TO RWY 22L. I WAS ON A BASE-TO-FINAL AND THE SAAB 340 WAS ALREADY ON FINAL. I WAS NOT CLRED TO LAND YET, BUT HAD TO MAKE A R 360 DEG TURN TO AVOID THE SAAB AND RETURN TO A FINAL APCH LEG TO THE RWY. I HAD A TCASII RA FROM THE SAAB AND THEN ANOTHER RA DURING THE 360 DEG MANEUVER AVOIDANCE TURN FROM OTHER CIRCLING AIRPLANES. TWR SEQUENCED US TOO CLOSE. MY SPD WAS MUCH GREATER THAN THE SAAB AND CLOSURE RATE WAS MISJUDGED BY THE CHICAGO TWR CTLR. ALL SLOWER AFT CLRED TO LAND AT MDW ARPT SHOULD LAND ON RWY 22R, NOT RWY 22L. JET TFC AND TURBOPROPS CANNOT SHARE THE VISUAL CIRCLE TO RWY 22L DUE TO SPD DIFFERENTIAL.

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.