Had a similar event a few years ago in a B737-800, due to an ADC failure. Passing through FL180 in climb, ASI on Capt's side showed low airspeed / black and white checked bars closely followed by stick shaker. Cross checked instruments with F/O's and standby, flew pitch and power settings and returned to base. All returned to normal in descent.
No major drama really ......
Last edited by Aldente; 9th Nov 2011 at 17:31.