EA50 pilot reported loss of control in flight at 10;000 feet after encountering severe turbulence.

Narrative:

IFR flight [and I] departed VFR having been issued the IFR clearance on the ground and having agreed to 'pick it up' in the air from [ATC]. On the climb; following the filed route; I was assigned 10;000 feet by controller and told to stand by for IFR clearance. While on the climb to; or shortly after leveling off at the assigned altitude of 10;000 feet; and immediately upon receiving a 'ready to copy clearance' call from the controller with my IFR clearance; I encountered severe turbulence leading to a momentary loss of control of the aircraft. Roll +/- 70 degrees; pitch down 45 degrees. Loss of altitude +/- 100 feet.my response was 'unable severe turbulence struggling to maintain control'. [Controller's] response: altitude your discretion. Commenced 180 degree turn; announced it; and the controller responded 'heading your discretion'. During the turn I experienced another severe turbulence event that once again caused momentary loss of control; with immediate recovery to steady flight.a few seconds later; in relatively smoother air I descended to 6;500 feet. I then asked and received an alternate IFR clearance to [destination]. Flight concluded uneventfully.nothing could have been done to avoid the situation except avoiding the area altogether; or; if I had received the IFR clearance earlier; perhaps an earlier climb may have put me above the rough air. Impossible to tell.

Original NASA ASRS Text

Title: EA50 pilot reported loss of control in flight at 10;000 feet after encountering severe turbulence.

Narrative: IFR flight [and I] departed VFR having been issued the IFR clearance on the ground and having agreed to 'pick it up' in the air from [ATC]. On the climb; following the filed route; I was assigned 10;000 feet by Controller and told to stand by for IFR clearance. While on the climb to; or shortly after leveling off at the assigned altitude of 10;000 feet; and immediately upon receiving a 'ready to copy clearance' call from the Controller with my IFR clearance; I encountered severe turbulence leading to a momentary loss of control of the aircraft. Roll +/- 70 degrees; pitch down 45 degrees. Loss of altitude +/- 100 feet.My response was 'unable severe turbulence struggling to maintain control'. [Controller's] response: Altitude your discretion. Commenced 180 degree turn; announced it; and the Controller responded 'heading your discretion'. During the turn I experienced another severe turbulence event that once again caused momentary loss of control; with immediate recovery to steady flight.A few seconds later; in relatively smoother air I descended to 6;500 feet. I then asked and received an alternate IFR clearance to [destination]. Flight concluded uneventfully.Nothing could have been done to avoid the situation except avoiding the area altogether; or; if I had received the IFR clearance earlier; perhaps an earlier climb may have put me above the rough air. Impossible to tell.

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	1529219
Time
Date	201803
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	Eclipse 500
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 4500 Flight Crew Type 400
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence