problem….

my aircraft experienced a very stiff stick yesterday wich was not corrected last night nor was it in ready status this morning either. The Hawk doesnt usualy develop these problems very often wich is not made my mind easier on getting back into it. It happened at low level in north Wales during a our low level training exercise, and after executing a left bank through the valley i leveled out and climbed back up and then things became stiff. I am no expert on hydrolics nor the flight controls on this aircraft. I havent talked to the machanics about the problem yet either. And they havent ask me to write up a problem report yet, but my instructor might have done this i guess. Has anyone got any knowlege on the flight controls or hydrolics on the Hawk trainer that might shed some light on this?