although the flight test programme will continue with the lithium-ion battery systems. In late 2015, A350 XWB msn. 24 was delivered with lighter Saft Li-ion batteries and in June 2017, fifty A350s were flying with them and benefiting from a two-year maintenance schedule instead of NiCd's 4–6 months. Parker Hannifin supplies the complete fuel package: inerting system, fuel measurement and management systems, mechanical equipment and fuel pumps. The fuel tank inerting system features air-separation modules to generate nitrogen-enriched air to reduce the flammability of fuel vapour in the tanks. Parker also provides hydraulic power generation and distribution system: reservoirs, manifolds, accumulators, thermal control, isolation, software and new engine- and electric motor-driven pump designs. Parker estimates the contracts will generate more than US$2 billion in revenues over the life of the programme. Cockpit and avionics The revised design of the A350 XWB's glass cockpit dropped the A380-sized display and adopted liquid-crystal display screens. The new six-screen configuration includes two central displays mounted one above the other (the lower one above the thrust levers) and a single (for each pilot) primary flight/navigation display, with an adjacent on-board information system screen. Airbus says the cockpit design allows for future advances in navigation technology to be placed on the displays plus gives flexibility and capacity to upload new software and to combine data from multiple sources and sensors for flight management and aircraft systems control. An optional head-up display is also present in the cockpit. Avionics are a further development of the integrated modular avionics (IMA) concept found on the A380. The A350's IMA will manage up to 40 functions (versus 23 functions for the A380) such as undercarriage, fuel, pneumatics, cabin environmental systems, and fire detection. Airbus stated that the benefits includes reduced maintenance and lower weight because as the IMA replaces multiple processors and LRUs with around 50% fewer standard computer modules known as line-replaceable modules. The IMA runs on a 100 Mbit/s network based on the AFDX standard, as employed in the A380, in place of the architecture used on the A330/A340. Propulsion In 2005, GE was the launch engine of the original A350, aiming for 2010 deliveries, while Rolls-Royce offered its Trent 1700. For the updated A350 XWB, GE offered a GEnx-3A87 for the A350-800/900, but not a higher thrust version needed for the A350-1000, which competes with the longer range 777 powered exclusively with the GE90-115B. In December 2006,