Lovely aeroplane to fly in,pilots aeroplane but difficult to maintain when new and increasingly difficult as they got older.Required more man hours and spares than contemporaries such as B747. It was a weird mix of the primitive, (rudder trim) and the advanced (Direct lift control system)The hydraulic service centre seemed like a good idea but was usually swimming in Skydrol and with the hot APU duct running through it working in there became impossible at times.Cannot really complain - made me a lot of money!