Yesterday, I had the F. S

Hi,I've been told twice about this problem, but I have't been able to reproduce it myself. Does it happen every time you reverse? Have you tried to engage and disengage auto-throttles? Did it make any effect?Paco

Tried it again, just by using the reversers to push myself back, and once again could not get it to go forward again.. Once again, tried everything I could think of, including playing with the autopilot and autothrottles this time, still no help....