A crj-900 flight crew had to return after takeoff as a gear pin was not removed from the right main ...

Narrative:

Upon arriving at the aircraft for the first flight of the day; I immediately noticed the logbook tagged; indicating an open write-up. I also noticed and verbalized to the first officer (first officer) we were missing one gear pin. Before powering on aircraft I called maintenance and notified him of the open write-up as well as the missing gear pin. The first officer finished his walk around and let me know the gear pins were removed. About that time; maintenance was just finishing our deferral and I asked about the gear pin. He said he spoke to the ground crew and they said it came in like that and also assured us he had looked and they were removed. He said we would need to get another one as soon as the plane went back to a maintenance base for the night.we departed and upon gear retraction we received a right gear disagree warning message. We ran the QRH; notified ATC and mx. We elected to burn off fuel to land below mlw and returned to field. Upon landing and securing the aircraft at the gate we went outside and saw that the gear pin had; in fact; been left in the right main landing gear without its red ribbon attached.

Original NASA ASRS Text

Title: A CRJ-900 flight crew had to return after takeoff as a gear pin was not removed from the right main gear.

Narrative: Upon arriving at the aircraft for the first flight of the day; I immediately noticed the logbook tagged; indicating an open write-up. I also noticed and verbalized to the First Officer (FO) we were missing one gear pin. Before powering on aircraft I called maintenance and notified him of the open write-up as well as the missing gear pin. The FO finished his walk around and let me know the gear pins were removed. About that time; maintenance was just finishing our deferral and I asked about the gear pin. He said he spoke to the ground crew and they said it came in like that and also assured us he had looked and they were removed. He said we would need to get another one as soon as the plane went back to a maintenance base for the night.We departed and upon gear retraction we received a right GEAR DISAGREE warning message. We ran the QRH; notified ATC and MX. We elected to burn off fuel to land below MLW and returned to field. Upon landing and securing the aircraft at the gate we went outside and saw that the gear pin had; in fact; been left in the right main landing gear without its red ribbon attached.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1329233
Time
Date	201602
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	Regional Jet 900 (CRJ900)
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy

A crj-900 flight crew had to return after takeoff as a gear pin was not removed from the right main gear.