Narrative:

After what initially appeared to be a normal takeoff and climbout with all callouts and checklists; the captain asked me if I noticed a 'rumbling' during our climb. We were at approximately 6;000 ft in our climbout of sea and slowly accelerating. I did notice the 'rumbling' he was talking about and after a very quick scan I noticed that the captain had not brought the gear up. I said 'the gear' and pointed at the gear. Before we could talk about slowing down to below 200 KTS (we were at exactly 215 KTS) the captain reached over and brought up the gear.after we had passed 10;000 ft in our climb he asked 'how did we miss that?' this started a discussion which ultimately led the captain to believe that when we had our initial 'positive rate' and 'gear up' calls; he just didn't get the gear up. He remembers hitting the lock and at least attempting to put the gear up; but it obviously was not put up. He also remarked that he was so used to confirming that the gear was down before landing during the landing checklist; the three green lights indicating the gear was down didn't register as it should have that the gear was not up during the after takeoff checklist.

Google
 

Original NASA ASRS Text

Title: Q400 Captain failed to raise the gear after takeoff and it was not noticed until both he and the First Officer noted a rumbling noise during climb.

Narrative: After what initially appeared to be a normal takeoff and climbout with all callouts and checklists; the Captain asked me if I noticed a 'rumbling' during our climb. We were at approximately 6;000 FT in our climbout of SEA and slowly accelerating. I did notice the 'rumbling' he was talking about and after a very quick scan I noticed that the Captain had not brought the gear up. I said 'the gear' and pointed at the gear. Before we could talk about slowing down to below 200 KTS (we were at exactly 215 KTS) the Captain reached over and brought up the gear.After we had passed 10;000 FT in our climb he asked 'How did we miss that?' This started a discussion which ultimately led the Captain to believe that when we had our initial 'positive rate' and 'gear up' calls; he just didn't get the gear up. He remembers hitting the lock and at least attempting to put the gear up; but it obviously was not put up. He also remarked that he was so used to confirming that the gear was down before landing during the landing checklist; the three green lights indicating the gear was down didn't register as it should have that the gear was not up during the after takeoff checklist.

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.