FCV is not a bad system, it only become bad when people don’t know how to use the system. People in Singapore who designed it and build it haven’t work offshore and never realized that ROV personnel who will work on the FCV need some space when they will be working on changing the low pressure filter of the sub. You need to take out some of the components around that filter just only to have access on it. You need a thin long fingers just to turn the needle valve at the back of the solenoid valve pack. I am talking here the FCV1030 which is a free flying ROV with a remote crane as a LARS.
Flying the FCV is very impressive aside from those things I mentioned above. They have plenty of schematics which is not updated so if you trace the wirings on the sub it will be more easy to find out which circuits are you going rather than to look the schematics that is presently available in the shack.
Anyway, you will find yourself comfortable in FCV in a week if there is no downtime.
