High low altitude winds alleged to be the cause of a track deviation when departing mdw, il, on the ...

Attributes
ACN	531053
Time
Date	200111
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 3000
Environment
Flight Conditions	Marginal
Weather Elements	Turbulence Rain
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure sid : mdw 4
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 : 10000 flight time type : 2000
ASRS Report	531053
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	inflight encounter : weather inflight encounter other non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllerb other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance
Consequence	faa : assigned or threatened penalties
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Weather
Air Traffic Incident	Operational Deviation Pilot Deviation

Narrative:

Departing runway 22L at mdw, overcast, rain showers, windshear advisories. Departure heading was a right turn heading 110 degrees on the mdw 4 departure. Heavy rain at rotation, gusty winds. Beginning the right turn to 110 degrees, winds began to increase. Leveling at 3000 ft, winds were south at 55 KTS. Controller called, gave a further right turn to 120 degrees and said 'check your SID.' the wind had drifted us past the 4 DME point. The mdw 4 departure off runway 22L is runway heading to 1300 ft then complete initially assigned turn within 4 DME of mdw. The controller then said he lost separation with ord traffic and would tell his supervisor and that it would be a pilot action. No traffic was noted on TCASII. Both the captain and myself realized we passed the 4 DME point, and were unable to call ATC due to heavy radio traffic. Contributing factor was the very strong gusty winds causing very high ground speed that drifted us out of the 4 DME area.

Original NASA ASRS Text

Title: HIGH LOW ALT WINDS ALLEGED TO BE THE CAUSE OF A TRACK DEV WHEN DEPARTING MDW, IL, ON THE MDW 4 DEP.

Narrative: DEPARTING RWY 22L AT MDW, OVCST, RAIN SHOWERS, WINDSHEAR ADVISORIES. DEP HDG WAS A R TURN HDG 110 DEGS ON THE MDW 4 DEP. HVY RAIN AT ROTATION, GUSTY WINDS. BEGINNING THE R TURN TO 110 DEGS, WINDS BEGAN TO INCREASE. LEVELING AT 3000 FT, WINDS WERE S AT 55 KTS. CTLR CALLED, GAVE A FURTHER R TURN TO 120 DEGS AND SAID 'CHK YOUR SID.' THE WIND HAD DRIFTED US PAST THE 4 DME POINT. THE MDW 4 DEP OFF RWY 22L IS RWY HDG TO 1300 FT THEN COMPLETE INITIALLY ASSIGNED TURN WITHIN 4 DME OF MDW. THE CTLR THEN SAID HE LOST SEPARATION WITH ORD TFC AND WOULD TELL HIS SUPVR AND THAT IT WOULD BE A PLT ACTION. NO TFC WAS NOTED ON TCASII. BOTH THE CAPT AND MYSELF REALIZED WE PASSED THE 4 DME POINT, AND WERE UNABLE TO CALL ATC DUE TO HVY RADIO TFC. CONTRIBUTING FACTOR WAS THE VERY STRONG GUSTY WINDS CAUSING VERY HIGH GND SPD THAT DRIFTED US OUT OF THE 4 DME AREA.

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.

High low altitude winds alleged to be the cause of a track deviation when departing mdw, il, on the mdw 4 departure.