After departure an LJ35 flight crew had difficulty following SID track due to a strong tailwind.

Attributes
ACN	524670
Time
Date	200109
Day	Fri
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 1700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : charter
Make Model Name	Learjet 25
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : midway
Flight Plan	IFR
Person 1
Affiliation	company : charter
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 5000 flight time type : 500
ASRS Report	524670
Events
Anomaly	non adherence : published procedure other spatial deviation
Resolutory Action	controller : issued advisory flight crew : returned to intended or assigned course none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed mdw on SID climb to 1300 ft MSL then return to 110 degrees. The winds were out of the south. I departed runway 31C and upon climbing to 1300 ft before making turn, I was pushed to the north. I made a maximum bank turn to 110 degrees. The controller said I exceeded the 4 mi limit. By my calculations, I was at 4 mi. The SID should reflect which is more relevant, the climb to 1300 ft MSL or the 4 mi radius. The reason this situation occurred was because of the strong winds out of the south 180 degrees at 19 KTS gusting 25 KTS.

Original NASA ASRS Text

Title: AFTER DEP AN LJ35 FLT CREW HAD DIFFICULTY FOLLOWING SID TRACK DUE TO A STRONG TAILWIND.

Narrative: DEPARTED MDW ON SID CLB TO 1300 FT MSL THEN RETURN TO 110 DEGS. THE WINDS WERE OUT OF THE S. I DEPARTED RWY 31C AND UPON CLBING TO 1300 FT BEFORE MAKING TURN, I WAS PUSHED TO THE N. I MADE A MAX BANK TURN TO 110 DEGS. THE CTLR SAID I EXCEEDED THE 4 MI LIMIT. BY MY CALCULATIONS, I WAS AT 4 MI. THE SID SHOULD REFLECT WHICH IS MORE RELEVANT, THE CLB TO 1300 FT MSL OR THE 4 MI RADIUS. THE REASON THIS SIT OCCURRED WAS BECAUSE OF THE STRONG WINDS OUT OF THE S 180 DEGS AT 19 KTS GUSTING 25 KTS.

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.