Hi there, first post!
I've been a technician for a few years and I've always notice A system hydraulic on the NG's (700 and 800) are almost always overserviced during layover svc chks. I remember back at Delta a few years ago we had a read and sign about overservicing A side but I forgot the reason behind it. The hyd qty gauge would read 1.06 but actual qty would be much higher.
I know techs are not over svcing A side. But some are at fault for svcing B side instead of transfering some fluid back from A. My current employer has the flight crew taxi in with #1 engine to facilitate a quicker turn around. They do not set parking brakes when parked as wheels are chocked.
Anyone have any insight on this? I know this is also a common issue with the 757 to but I just can't remember the reason behind it. I do remember T/S a 757 hyd transfer issue. It's been a few years but I remember the fim calling out a procdure to check for alernate brakes shuttle valve leakage (correct me if i'm wrong, been awhile). None was noted. I believe the 737ng fim calls for a similar senario but I have a hard time believing a whole fleet would have this issue.