Narrative:

[We were] climbing to assigned altitude of FL310 when I engaged vertical speed mode of autopilot and disabled altitude hold and climbed through assigned altitude. I realized my mistake at FL313 and airplane momentarily reached FL315 as I descended back to FL310. No other traffic was in the vicinity and no loss of separation occurred. I feel the error occurred because of fatigue due to waking up early that morning. This was day four of a four day trip in which I had flown nights the previous three days followed by an early morning check in after a scheduled 11 hour 24 minute layover. I should have verbalized my action of changing the autopilot mode to allow the pilot not flying to trap the error.

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Original NASA ASRS Text

Title: A B717 First Officer reported climbing through the assigned flight level by engaging the vertical speed mode of the autopilot and disabling the altitude hold function. Fatigue was cited as a contributing factor.

Narrative: [We were] climbing to assigned altitude of FL310 when I engaged vertical speed mode of autopilot and disabled altitude hold and climbed through assigned altitude. I realized my mistake at FL313 and airplane momentarily reached FL315 as I descended back to FL310. No other traffic was in the vicinity and no loss of separation occurred. I feel the error occurred because of fatigue due to waking up early that morning. This was day four of a four day trip in which I had flown nights the previous three days followed by an early morning check in after a scheduled 11 hour 24 minute layover. I should have verbalized my action of changing the autopilot mode to allow the pilot not flying to trap the error.

Data retrieved from NASA's ASRS site as of April 2012 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.