Narrative:

Shortly after takeoff; received amber EFIS miscompare EICAS message followed by amber IAS and altitude flags on both pfd's. All 3 altimeters and airspeed indicators showed something different. We were unsure which indication was correct. We contacted chief pilot on duty who also discussed with maintenance and we elected to remain VMC and make a precautionary diversion and uneventful landing. Prior to landing; we heard a 'pop' and all indications went back to normal and agreed with each other. Upon post flight inspection; we discovered the pins for the large square plastic static cover on the right side were in place; but the cover was missing. I obviously accidentally forgot to remove the cover. After further thought; I believe that during preflight I had noticed that the right side aoa cover had a pin missing and proceeded to send that write-up to maintenance. I had already removed all the other covers (except for the static cover; apparently); and put them on the ground so I could type in the MEL. I must have then picked the covers up and continued with the preflight at the wing root; completely unaware that I had yet to remove the static cover. This was a matter of unintentional distraction while trying to do too much all at once; and not an issue of trying to rush. One should stay focused on the matter at hand. Complete the preflight checklist before dealing with any maintenance issues that are discovered along the way. Also; count the covers after removal and ensure that all are present prior to stowing.

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Original NASA ASRS Text

Title: A corporate jet flight crew reported receiving EICAS EFIS MISCOMPARE message shortly after takeoff. They diverted for a precautionary landing and found the right side static cover had not been removed before flight.

Narrative: Shortly after takeoff; received amber EFIS miscompare EICAS message followed by amber IAS and ALT flags on both PFD's. All 3 altimeters and airspeed indicators showed something different. We were unsure which indication was correct. We contacted Chief Pilot on duty who also discussed with Maintenance and we elected to remain VMC and make a precautionary diversion and uneventful landing. Prior to landing; we heard a 'pop' and all indications went back to normal and agreed with each other. Upon post flight inspection; we discovered the pins for the large square plastic static cover on the right side were in place; but the cover was missing. I obviously accidentally forgot to remove the cover. After further thought; I believe that during preflight I had noticed that the right side AOA cover had a pin missing and proceeded to send that write-up to Maintenance. I had already removed all the other covers (except for the static cover; apparently); and put them on the ground so I could type in the MEL. I must have then picked the covers up and continued with the preflight at the wing root; completely unaware that I had yet to remove the static cover. This was a matter of unintentional distraction while trying to do too much all at once; and not an issue of trying to rush. One should stay focused on the matter at hand. Complete the preflight checklist before dealing with any maintenance issues that are discovered along the way. Also; count the covers after removal and ensure that all are present prior to stowing.

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.