The aircraft monitors various sensors and automatically alerts the crew to any parameters outside of their normal range; pilots can also inspect individual systems. Electronic manuals are used instead of paper ones, with optional web-based updates. Maintenance difficulty and cost were reduced to half of that of the earlier and smaller Airbus A310. Improved engine control and monitoring improved time on wing. The centralised maintenance computer can transmit real-time information to ground facilities via the onboard satellite-based ACARS datalink. Heavy maintenance like structural changes remained unchanged, while cabin sophistications, like the in-flight entertainment, were increased over preceding airliners.