No problem with the FMS, you can upload all the info before startup, the only reason to power off the screens is to protect them, they are all style catode tubes not the modern LCD. Lear 60 is nice and hard aircraft, thera are few points you have to watch to have a smooth flight. Watch engine oil carefully every 10 hours, oxygen system leaks on all the Lears 60 I have flown as well as Gear air, don't be hard on the brakes if you fly the 2 disk types, use reverses mostly and be careful with OAT changes on flight, it will get you into the overspeed business in miliseconds!!! those 2 rockets on the back are really rockets, you can do 15.000fpm on this baby.