B757, crew on departure, overshot assigned heading.

Attributes
ACN	497630
Time
Date	200101
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon tower : mdw.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 13000 flight time type : 2500
ASRS Report	497630
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Cleared for takeoff on mdw runway 22 and given a heading on departure of 250 degrees, which is customary. I was PF. First officer stated he would get heading selector to 250 degrees. We began takeoff. After liftoff, first officer was dialing heading and flight director commanded a right turn, which was normal. We were turning directly into the sun which complicated my scan, and I observed that I had past the bug and heading of 250 degrees. I stopped turn at 300 degrees. I was confused because the flight director was still commanding a right turn. We were in heading mode and heading was set correctly. We later determined the problem was pilot error in that the first officer dialed in a turn greater than 180 degrees (went all the way around) and I was unaware of this. I had turned past 250 degrees by the time he set 250 degrees in the window, so the flight director was still commanding a right turn. I began a left turn slowly because I wasn't sure at that time what was wrong. (We were given another heading to 270 degrees, gut flight director still commanded a right turn). Mitigating factors were a late departure due to WX delays, departure runway change from initial planning, and first officer felt fatigued due to body clock change (wake-up at XA00 where he resides).

Original NASA ASRS Text

Title: B757, CREW ON DEP, OVERSHOT ASSIGNED HDG.

Narrative: CLRED FOR TKOF ON MDW RWY 22 AND GIVEN A HDG ON DEP OF 250 DEGS, WHICH IS CUSTOMARY. I WAS PF. FO STATED HE WOULD GET HDG SELECTOR TO 250 DEGS. WE BEGAN TKOF. AFTER LIFTOFF, FO WAS DIALING HDG AND FLT DIRECTOR COMMANDED A R TURN, WHICH WAS NORMAL. WE WERE TURNING DIRECTLY INTO THE SUN WHICH COMPLICATED MY SCAN, AND I OBSERVED THAT I HAD PAST THE BUG AND HDG OF 250 DEGS. I STOPPED TURN AT 300 DEGS. I WAS CONFUSED BECAUSE THE FLT DIRECTOR WAS STILL COMMANDING A R TURN. WE WERE IN HDG MODE AND HDG WAS SET CORRECTLY. WE LATER DETERMINED THE PROB WAS PLT ERROR IN THAT THE FO DIALED IN A TURN GREATER THAN 180 DEGS (WENT ALL THE WAY AROUND) AND I WAS UNAWARE OF THIS. I HAD TURNED PAST 250 DEGS BY THE TIME HE SET 250 DEGS IN THE WINDOW, SO THE FLT DIRECTOR WAS STILL COMMANDING A R TURN. I BEGAN A L TURN SLOWLY BECAUSE I WASN'T SURE AT THAT TIME WHAT WAS WRONG. (WE WERE GIVEN ANOTHER HDG TO 270 DEGS, GUT FLT DIRECTOR STILL COMMANDED A R TURN). MITIGATING FACTORS WERE A LATE DEP DUE TO WX DELAYS, DEP RWY CHANGE FROM INITIAL PLANNING, AND FO FELT FATIGUED DUE TO BODY CLOCK CHANGE (WAKE-UP AT XA00 WHERE HE RESIDES).

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.