The 92 stock can be driven in Coded Manual EAST of Leytonstone and WEST of White City on Sundays, all other times the 92s should be driven in ATO unless there is a fault, authority from Wood Lane has to be given if a 92 needs to be driven in Coded Manual for another reason.
When inside a Depot on the Central Line there are no codes, the 92s are driven in Restricted Manual within depot areas.
There are quite a few problems with ATO in rainy conditions, Stratford (both roads) is common for skidding and wheel lock ups, I once heard a Train heading up the EB road approached the platform, applied the brakes and began to skid, the Train stopped... ...Only 9 cars past the platform! (so that's a whole Train and a bit more!)
ATO was running over the entire Central when Chancery Lane happened, AFAIK not only the Bolts holding the motors were the cause, the stress on the Trains Motors (blame ATO for it's rapid acceleration and braking) caused them to drop off too, now the 92 stock Motors have been slowed down and the running speed is now 85kph. (used to be near 110kph pre-Chancery Lane IIRC)