Crj-200 flight crew with the captain flying reports drifting left of course on takeoff from runway 9...

Narrative:

During rotation from runway 9L in atl the captain immediately went IMC due to poor weather conditions. The captain was the pilot flying. Upon entering IMC conditions the captain experienced the leans and started drifting to the left of course. We were assigned the dawgs (RNAV) departure with the first fix of lidas. Immediately the first officer reported 'left of course turn right' soon after ATC inquired about our heading and the wind. They immediately assigned a heading of 120. A correction by the captain was established when the first officer told the captain he had the leans. After that the first officer reported the wind; which was not a factor. (The winds were calm to 10 knots) soon after a heading of 140 was assigned. Once on the assigned heading the after takeoff checklist was completed. We were then given direct dawgs.this was our last leg of the day; it was night; low IMC; and we had an early duty in. We were left of course and corrected to prevent a lateral deviation into the other controller's airspace. As pilot monitoring I feel that I should take the controls from the captain; because he had a delayed response in correcting his lateral deviation.

Original NASA ASRS Text

Title: CRJ-200 flight crew with the Captain flying reports drifting left of course on takeoff from Runway 9L at ATL due to entering IMC at rotation. The heading bug had not been set to runway heading prior to takeoff and the Captain became slightly disorientated.

Narrative: During rotation from RWY 9L in ATL the captain immediately went IMC due to poor weather conditions. The captain was the pilot flying. Upon entering IMC conditions the Captain experienced the leans and started drifting to the left of course. We were assigned the DAWGS (RNAV) departure with the first fix of LIDAS. Immediately the first officer reported 'left of course turn right' soon after ATC inquired about our heading and the wind. They immediately assigned a heading of 120. A correction by the captain was established when the first officer told the captain he had the leans. After that the first officer reported the wind; which was not a factor. (The winds were calm to 10 knots) Soon after a heading of 140 was assigned. Once on the assigned heading the after takeoff checklist was completed. We were then given direct DAWGS.This was our last leg of the day; it was night; low IMC; and we had an early duty in. We were left of course and corrected to prevent a lateral deviation into the other controller's airspace. As pilot monitoring I feel that I should take the controls from the captain; because he had a delayed response in correcting his lateral deviation.

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	1229650
Time
Date	201501
Local Time Of Day	0601-1200
Place
Locale Reference	ATL.Airport
State Reference	GA
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Flying
Events
Anomaly	Deviation - Procedural Clearance Deviation - Track / Heading All Types Flight Deck / Cabin / Aircraft Event Other / Unknown

Crj-200 flight crew with the captain flying reports drifting left of course on takeoff from runway 9L at atl due to entering IMC at rotation. The heading bug had not been set to runway heading prior to takeoff and the captain became slightly disorientated.