Narrative:

Upon arrival at gate; aircraft needed maintenance for [integrated avionics processor system] degraded write up. Mechanic completed repair after going to hangar to get DCU to replace DCU #2. Mechanic indicated part came out of another aircraft. After sign off; I completed preflight and after maintenance walk around. Paid particular attention to avionics bay where repair was made. Inspected nose gear area and felt confident [that the] door was closed. Push back was completed and no indication from ground crew concerning door position. During taxi and prior to takeoff; no warnings posted and to configuration ok message posted. Upon takeoff; gear cycled and we got a nose door open warning on EICAS. [We] ran the QRH checklist and notified departure; maintenance; dispatch and operations. Completed all appropriate checklists and made normal approach and landing. Gear was extended on down wind. Landed under landing weight and parked at gate. Maintenance met aircraft and; I think; recycled the nose door switch. Door closed and write up was cleared and signed off by maintenance. Dispatch issued new release and second attempt of flight completed without complication. Only undesired aircraft state was nose door open. No other threats recognized.don't know if taking part from donor aircraft in hangar could have contributed to the event. Both of us are confident that no warnings were posted. Don't think pilot on the flight deck could have missed an aural door open warning as well as posted red warning; if switch was left in wrong position on preflight inspection.

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Original NASA ASRS Text

Title: CRJ200 nose gear doors failed to close after gear retraction. Flight returns to departure airport where Mechanic cycled the exterior gear door switch and the doors closed normally.

Narrative: Upon arrival at gate; aircraft needed maintenance for [integrated avionics processor system] degraded write up. Mechanic completed repair after going to hangar to get DCU to replace DCU #2. Mechanic indicated part came out of another aircraft. After sign off; I completed preflight and after Maintenance walk around. Paid particular attention to avionics bay where repair was made. Inspected nose gear area and felt confident [that the] door was closed. Push back was completed and no indication from ground crew concerning door position. During taxi and prior to takeoff; no warnings posted and TO CONFIG OK message posted. Upon takeoff; gear cycled and we got a NOSE DOOR OPEN warning on EICAS. [We] ran the QRH checklist and notified Departure; Maintenance; Dispatch and Operations. Completed all appropriate checklists and made normal approach and landing. Gear was extended on down wind. Landed under landing weight and parked at gate. Maintenance met aircraft and; I think; recycled the nose door switch. Door closed and write up was cleared and signed off by Maintenance. Dispatch issued new release and second attempt of flight completed without complication. Only undesired aircraft state was nose door open. No other threats recognized.Don't know if taking part from donor aircraft in hangar could have contributed to the event. Both of us are confident that no warnings were posted. Don't think pilot on the flight deck could have missed an aural door open warning as well as posted red warning; if switch was left in wrong position on preflight inspection.

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.