Emb-175 flight crew reported the left aileron was jammed on the captain's side.

Attributes
ACN	1608497
Time
Date	201901
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Aileron Control System
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 3600 Flight Crew Type 250
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During the RNAV visual approach to xxr aircraft X had a jammed control wheel (aileron) specifically no left roll at approx 600 AGL shortly after disconnecting the autopilot; while rolling out of the turn to final. I was flying at the time of the malfunction. I brought it to the attention of [the] captain; and we exchanged control to find that his left ailerons were also jammed. Captain quickly and verbally performed the memory item with confirmation and disconnected the aileron. We then determined that the right side controls had roll authority; while the captain was helping on the elevator in case of any other issues. Together we continued a stable approach to landing in the touchdown zone and on centerline. Maintenance at ZZZ found a flashlight left in the forward electronics bay and speculated that to be the cause of the jam.

Original NASA ASRS Text

Title: EMB-175 flight crew reported the left aileron was jammed on the Captain's side.

Narrative: During the RNAV visual approach to XXR Aircraft X had a jammed control wheel (aileron) specifically no left roll at approx 600 AGL shortly after disconnecting the autopilot; while rolling out of the turn to final. I was flying at the time of the malfunction. I brought it to the attention of [the] Captain; and we exchanged control to find that his left ailerons were also jammed. Captain quickly and verbally performed the memory item with confirmation and disconnected the aileron. We then determined that the right side controls had roll authority; while the Captain was helping on the elevator in case of any other issues. Together we continued a stable approach to landing in the touchdown zone and on centerline. Maintenance at ZZZ found a flashlight left in the forward Electronics bay and speculated that to be the cause of the jam.

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.