Narrative:

I was the pilot flying as we were being vectored approach control for 22. We were on a heading but I don't remember what it was. I heard ATC say to turn to a heading of 170 so I turned the heading knob to that heading as the autopilot was engaged. I do not recall what the captain read back only what I heard and therefore did. They told us to turn to a 090 heading but changed it to a west heading. We were vectored around again for another approach. There was no loss off separation. Upon landing we were told to call ATC. There were other aircraft with flight numbers that were close to ours as well; so that may have added to my confusion. So I am still replaying it in my mind trying to figure out how I could have got it so wrong. Later in the day; I was advised to go get tested for possible carbon monoxide contamination. I went to the hospital late that night and was tested positive for 'carbon monoxide exposure' as this is how it reads on my discharge paperwork. The doctor said my readings were elevated at that time of night which was very late that night; 12+ hours later; and would have been much higher at the time of this event but who knows how high it was. I did not know at the time about the carbon monoxide. It sneaks up on you without you knowing you are being affected as it did to us. So watch out for each other. This is very rare in planes. I think but maybe a carbon monoxide monitor installed in the cockpit might be a good option.

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Original NASA ASRS Text

Title: A CRJ-200 flight crew reported they experienced a heading deviation during approach to destination. Post flight; the Captain reported he was unable to concentrate feeling unfit physically and mentally for the next flight; and decided to remove himself from duty. Captain went to the Doctor and blood test results were consistent with Carbon Monoxide poisoning; which could have been a contributing factor in the heading deviation. First Officer flew four additional legs before he was called and removed from flying; he also tested positive for Carbon Monoxide.

Narrative: I was the pilot flying as we were being vectored Approach Control for 22. We were on a heading but I don't remember what it was. I heard ATC say to turn to a heading of 170 so I turned the heading knob to that heading as the autopilot was engaged. I do not recall what the Captain read back only what I heard and therefore did. They told us to turn to a 090 heading but changed it to a west heading. We were vectored around again for another approach. There was no loss off separation. Upon landing we were told to call ATC. There were other aircraft with flight numbers that were close to ours as well; so that may have added to my confusion. So I am still replaying it in my mind trying to figure out how I could have got it so wrong. Later in the day; I was advised to go get tested for possible Carbon Monoxide contamination. I went to the hospital late that night and was tested positive for 'Carbon Monoxide Exposure' as this is how it reads on my discharge paperwork. The Doctor said my readings were elevated at that time of night which was very late that night; 12+ hours later; and would have been much higher at the time of this event but who knows how high it was. I did not know at the time about the Carbon Monoxide. It sneaks up on you without you knowing you are being affected as it did to us. So watch out for each other. This is very rare in planes. I think but maybe a Carbon Monoxide monitor installed in the cockpit might be a good option.

Data retrieved from NASA's ASRS site as of July 2013 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.