A CRJ200 flight crew experienced landing gear disagree warning after takeoff. They ran the checklist...

Narrative:

As a reserve pilot; I received a call from scheduling at XA33 for an XC00 report time. On my way to the airport; I received a call from dispatch asking to depart on time if at all possible. The reason for this call was that the crew for this flight was not scheduled for the usual 45 minutes from our show time to departure time; but only 30 minutes. At my arrival at the airplane; the first officer was already present and started setting up the aircraft and did the walkaround for the preflight duties. The flight pushed off the gate 3 minutes before scheduled departure time. Just after takeoff; we received the master warning for landing gear disagreement. We ran the required checklist; declared an emergency; and returned to ZZZ. Upon arrival at the gate; we discovered that the left main landing gear was still pinned. The fact that the crew did not receive the proper callout time/report time to operate this flight; certainly was a factor in this incident. Also; the call from dispatch put more pressure on us to depart this flight on time.

Original NASA ASRS Text

Title: A CRJ200 flight crew experienced LANDING GEAR DISAGREE warning after takeoff. They ran the checklist; declared an emergency and returned to their departure airport; where they found the left main landing gear was still pinned.

Narrative: As a reserve pilot; I received a call from Scheduling at XA33 for an XC00 report time. On my way to the airport; I received a call from Dispatch asking to depart on time if at all possible. The reason for this call was that the crew for this flight was not scheduled for the usual 45 minutes from our show time to departure time; but only 30 minutes. At my arrival at the airplane; the First Officer was already present and started setting up the aircraft and did the walkaround for the preflight duties. The flight pushed off the gate 3 minutes before scheduled departure time. Just after takeoff; we received the Master Warning for Landing Gear Disagreement. We ran the required checklist; declared an emergency; and returned to ZZZ. Upon arrival at the gate; we discovered that the left main landing gear was still pinned. The fact that the crew did not receive the proper callout time/report time to operate this flight; certainly was a factor in this incident. Also; the call from Dispatch put more pressure on us to depart this flight on time.

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.

Attributes
ACN	822134
Time
Date	200902
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb Parked
Flight Plan	IFR
Component
Aircraft Component	Main Gear
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Commercial
Events
Anomaly	Aircraft Equipment Problem Critical

A CRJ200 flight crew experienced landing gear disagree warning after takeoff. They ran the checklist; declared an emergency and returned to their departure airport; where they found the left main landing gear was still pinned.