Ce-560 first officer reported the flight crew became aware after takeoff that the first officer's ai...

Narrative:

[I] boarded the airplane. I [attempted] to turn on hydraulic switch to set brakes; but don't find hydraulic switch immediately. Captain reaches in and turns on hydraulic pump and set brakes and leaves airplane to go inside [office]. While captain is inside; I review routing and look at taxi plate and approach for ILS at [our destination]. The captain comes back and we do before start flow and start engines. With both engines started get clearance and taxi to [the runway]. While taxing we do the taxi checklist and finish up with the before takeoff checklist. We line up for takeoff on [the runway] and takeoff. (My leg) on takeoff and after vr I notice right away that the flight controls feel different. My yoke is way far to the right; roll control is unusually sensitive. I check rudder trim and try to center yoke; but no yoke movement.after the gear is up and flaps up we get vectors for a left turn; again the roll control is extremely sensitive. Rudder input is firm and normal. Aileron does not move until the yoke is almost fully to the stop. Aileron control is sensitive still. I engage the autopilot and verify yaw damper is on. Autopilot disengages. At a safe altitude I tell the captain that his aileron appear normal and show him my controls. I tell him he has the controls. Controls are normal on his side. We do the abnormal checklist for jammed controls and land at [nearest airport] as directed by the abnormal checklist. (Land at nearest airport). Check landing distance and do D&a landing check and land without the use of spoilers. In-flight it was noticed that the 'T' handle was up and that explained why the condition existed. 'T' handled when pulled disconnects aileron control from the copilot and leaves spoiler roll only.on the ground we tried to figure out how it was possible for the 'T' handle to be up. I noted that the metal below the handle was bent up and the guard appeared to be somewhat damaged. Still no answer why the 'T' handle was up.my best guess would be that it was hit with the captain's foot on the way out of the cockpit or my seat belt snagged it and when I tighten my seat belt before takeoff and leaned forward that perhaps the handle was pulled by my seatbelt. This is purely a guess.the fix to prevent this from happening again would be to put a lever latch over the 'T' handle.

Original NASA ASRS Text

Title: CE-560 First Officer reported the flight crew became aware after takeoff that the First Officer's aileron control had been unintentionally disconnected via the T handle.

Narrative: [I] boarded the airplane. I [attempted] to turn on hydraulic switch to set brakes; but don't find hydraulic switch immediately. Captain reaches in and turns on hydraulic pump and set brakes and leaves airplane to go inside [office]. While Captain is inside; I review routing and look at taxi plate and approach for ILS at [our destination]. The Captain comes back and we do before start flow and start engines. With both engines started get clearance and taxi to [the runway]. While taxing we do the taxi checklist and finish up with the before takeoff checklist. We line up for takeoff on [the runway] and takeoff. (My leg) on takeoff and after Vr I notice right away that the flight controls feel different. My yoke is way far to the right; roll control is unusually sensitive. I check rudder trim and try to center yoke; but no yoke movement.After the gear is up and flaps up we get vectors for a left turn; again the roll control is extremely sensitive. Rudder input is firm and normal. Aileron does not move until the yoke is almost fully to the stop. Aileron control is sensitive still. I engage the autopilot and verify yaw damper is on. Autopilot disengages. At a safe altitude I tell the Captain that his aileron appear normal and show him my controls. I tell him he has the controls. Controls are normal on his side. We do the abnormal checklist for jammed controls and land at [nearest airport] as directed by the abnormal checklist. (Land at nearest airport). Check landing distance and do D&A landing check and land without the use of spoilers. In-flight it was noticed that the 'T' handle was up and that explained why the condition existed. 'T' handled when pulled disconnects aileron control from the copilot and leaves spoiler roll only.On the ground we tried to figure out how it was possible for the 'T' handle to be up. I noted that the metal below the handle was bent up and the guard appeared to be somewhat damaged. Still no answer why the 'T' handle was up.My best guess would be that it was hit with the Captain's foot on the way out of the cockpit or my seat belt snagged it and when I tighten my seat belt before takeoff and leaned forward that perhaps the handle was pulled by my seatbelt. This is purely a guess.The fix to prevent this from happening again would be to put a lever latch over the 'T' handle.

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	1398471
Time
Date	201610
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Citation III VI VII (C650)
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 17500 Flight Crew Type 6
Events
Anomaly	Aircraft Equipment Problem Less Severe

Ce-560 first officer reported the flight crew became aware after takeoff that the first officer's aileron control had been unintentionally disconnected via the T handle.