Narrative:

A normal takeoff procedure was utilized with reduced thrust. Shortly after rotation and after a positive rate was established; the gear handle was selected in the 'up' position. Shortly after; the following 2 master warning messages showed up: nose door open and gear disagreement. The nose gear showed down and locked (green). The 2 mains showed white. The QRH was followed for nose door open. Gear handle selected to the 'down' position and all 3 showed down and locked (green). An emergency was declared and the flight returned to mht. A normal approach and landing followed. The flight attendant and passenger were notified via intercom PA. Between the moment the gear handle was selected up until we started the QRH procedures took about 3 mins. Callback conversation with reporter revealed the following information: it was determined that there was switch malfunction. There is a series of timers activated by raising the gear handle. At 6 seconds; the nose gear door is supposed too open. This was not sensed so the sequencing was stopped; preventing the retraction of the gear and possible damage to the doors. This is a common problem in the winter when operating off contaminated surfaces. It is usually corrected by cleaning the wheel well area.

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Original NASA ASRS Text

Title: A CRJ200 HAS A NOSE DOOR OPEN AND A GEAR DISAGREEMENT INDICATION AFTER TKOF.

Narrative: A NORMAL TKOF PROC WAS UTILIZED WITH REDUCED THRUST. SHORTLY AFTER ROTATION AND AFTER A POSITIVE RATE WAS ESTABLISHED; THE GEAR HANDLE WAS SELECTED IN THE 'UP' POS. SHORTLY AFTER; THE FOLLOWING 2 MASTER WARNING MESSAGES SHOWED UP: NOSE DOOR OPEN AND GEAR DISAGREEMENT. THE NOSE GEAR SHOWED DOWN AND LOCKED (GREEN). THE 2 MAINS SHOWED WHITE. THE QRH WAS FOLLOWED FOR NOSE DOOR OPEN. GEAR HANDLE SELECTED TO THE 'DOWN' POS AND ALL 3 SHOWED DOWN AND LOCKED (GREEN). AN EMER WAS DECLARED AND THE FLT RETURNED TO MHT. A NORMAL APCH AND LNDG FOLLOWED. THE FLT ATTENDANT AND PAX WERE NOTIFIED VIA INTERCOM PA. BTWN THE MOMENT THE GEAR HANDLE WAS SELECTED UP UNTIL WE STARTED THE QRH PROCS TOOK ABOUT 3 MINS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: IT WAS DETERMINED THAT THERE WAS SWITCH MALFUNCTION. THERE IS A SERIES OF TIMERS ACTIVATED BY RAISING THE GEAR HANDLE. AT 6 SECONDS; THE NOSE GEAR DOOR IS SUPPOSED TOO OPEN. THIS WAS NOT SENSED SO THE SEQUENCING WAS STOPPED; PREVENTING THE RETRACTION OF THE GEAR AND POSSIBLE DAMAGE TO THE DOORS. THIS IS A COMMON PROB IN THE WINTER WHEN OPERATING OFF CONTAMINATED SURFACES. IT IS USUALLY CORRECTED BY CLEANING THE WHEEL WELL AREA.

Data retrieved from NASA's ASRS site as of January 2009 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.