Heading track deviation.

Attributes
ACN	214259
Time
Date	199207
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Flight Phase	cruise other cruise other
Route In Use	enroute : 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 total : 8200
ASRS Report	214259
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After a series of continuous duty overnights, I misunderstood a heading given by ATC. I was not fatigued, but was tired due to the breakup of normal sleep pattern. During my scan, I caught the discrepancy because my first officer had a different heading bugged. ATC questioned us while I was turning to the correct heading. It did not produce a conflict either for the controller, nor on TCASII.

Original NASA ASRS Text

Title: HDG TRACK DEV.

Narrative: AFTER A SERIES OF CONTINUOUS DUTY OVERNIGHTS, I MISUNDERSTOOD A HDG GIVEN BY ATC. I WAS NOT FATIGUED, BUT WAS TIRED DUE TO THE BREAKUP OF NORMAL SLEEP PATTERN. DURING MY SCAN, I CAUGHT THE DISCREPANCY BECAUSE MY FO HAD A DIFFERENT HDG BUGGED. ATC QUESTIONED US WHILE I WAS TURNING TO THE CORRECT HDG. IT DID NOT PRODUCE A CONFLICT EITHER FOR THE CTLR, NOR ON TCASII.

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.