Air carrier exceeds mileage restr in turn during mdw 4 departure.

Attributes
ACN	460210
Time
Date	200001
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon tower : det.tower
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : midway 4
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : multi engine pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 6000
ASRS Report	460210
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other controllerb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On takeoff runway 22 from mdw on midway 4 departure we were given a right turn to 090 degrees. After passing 1300 ft, I began a 20-25 degree right bank turn to 090 degrees. Approximately 40-60 degrees into the turn, my first officer switched my navigation to the next frequency. I had thought my turn would keep me inside the 4 DME restr, but departure asked me to tighten up my turn as I had exceeded the 4 DME arc. 2 aircraft immediately behind me also exceeded the restr. I did not notice the winds aloft, but they must have been such to have a negative impact on our turn radius. Lesson learned: keep the appropriate NAVAID tuned and monitor until all restrs are made.

Original NASA ASRS Text

Title: ACR EXCEEDS MILEAGE RESTR IN TURN DURING MDW 4 DEP.

Narrative: ON TKOF RWY 22 FROM MDW ON MIDWAY 4 DEP WE WERE GIVEN A R TURN TO 090 DEGS. AFTER PASSING 1300 FT, I BEGAN A 20-25 DEG R BANK TURN TO 090 DEGS. APPROX 40-60 DEGS INTO THE TURN, MY FO SWITCHED MY NAV TO THE NEXT FREQ. I HAD THOUGHT MY TURN WOULD KEEP ME INSIDE THE 4 DME RESTR, BUT DEP ASKED ME TO TIGHTEN UP MY TURN AS I HAD EXCEEDED THE 4 DME ARC. 2 ACFT IMMEDIATELY BEHIND ME ALSO EXCEEDED THE RESTR. I DID NOT NOTICE THE WINDS ALOFT, BUT THEY MUST HAVE BEEN SUCH TO HAVE A NEGATIVE IMPACT ON OUR TURN RADIUS. LESSON LEARNED: KEEP THE APPROPRIATE NAVAID TUNED AND MONITOR UNTIL ALL RESTRS ARE MADE.

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.