EGTSTM – Electric taxi solution

03/02/2015
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EGTSTM – Electric taxi solution

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application/pdf EGTSTM – Electric taxi solution Christophe Devillers
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EGTSTM – Electric taxi solution

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EGTSTM – Electric taxi solution Christophe DEVILLERS VP Engineering EGTS MESSIER-BUGATTI-DOWTY christophe.devillers@safranmbd.com Abstract With increasing fuel costs, airlines are seeking ways to save fuel and therefore money. EGTS electric taxiing system offers an alternative solution to traditional aircraft taxiing operations, by reducing fuel burn and delivering environmental benefits, as well as improving gate operations efficiency. EGTS allows the aircraft to pushback and taxi under APU generated electrical power without the main engines running. Electrical wheel actuators are located in main landing gear wheels for maximized performance, traction and agility. Airlines pilots who had the opportunity to test drive the EGTS prototype in March 2014 gave very positive feedback on the EGTS ease of use and responsiveness. Further studies are conducted as part of Clean Sky 2 program to mature these technologies and achieve a higher integration of EGTS with the aircraft systems. Introduction With oil prices expected to remain at record prices and with continued volatility in the market, airlines continue to look for new ways to save fuel and therefore money. Fuel costs are an ever-increasing drain on airline revenues and profits – accounting for between 30- 40% of Direct Operating Costs (DOCs), and up to 50% of airline DOCs in some regions of the world. With this in mind, taxi operations represent a significant portion of an airline’s fuel costs – up to 6% of fleet fuel consumption for short-haul fleets operating single-aisle aircraft from congested airports. The global family of short-haul aircraft burns as much as five million tonnes of fuel per year during taxi operations alone. The need for an alternative solution to traditional aircraft taxiing operations, which reduces fuel burn and delivers environmental benefits, is now greater than ever. EGTS benefits to Airlines and Environment EGTS electric taxiing system uses power from the aircraft's Auxiliary Power Unit (APU) generator to electrically power motors fitted to the main landing gear wheels. The system allows an aircraft to push back without tug assistance and then taxi towards the runway without the main engines running. EGTS combines Safran’s extensive experience in integrated landing gear systems with Honeywell’s heritage in APU technologies. Primary benefit of EGTS is fuel savings and reduction of greenhouse gases emissions. EGTS offers more than 50% fuel saving on ground compared to conventional Dual Engine Taxi operations. It can result in savings of up to 4% of mission block fuel consumption. At 2,000 flights per annum, each aircraft using EGTS on American airports would reduce CO2 emissions by up to 61% (equivalent to planting 948 trees) and NOx emissions by up to 51% (equivalent to removing 932 cars from the road). Fig. 1: EGTS environmental benefits Beyond fuel and emissions savings, EGTS will also improve gate operations efficiency by :  Eliminating need for ground tugs  Reducing pushback phase duration  Ultimately reducing turnaround time and improving On-Time Performance  Increasing ground personnel safety and health : no engines running on the apron, no jet blast, reduced noise For airlines that operate high-cycle, single-aisle aircraft, the EGTS is expected to generate a projected savings of more than USD $200,000 per aircraft per year. EGTS International The EGTS electric taxi solution was first announced at the Paris Air Show June 2011, where Honeywell and Safran signed a memorandum of understanding to create a joint venture company called EGTS International (EGTSi) to deliver an innovative green taxiing solution for new and existing aircraft. The joint venture encompasses system development, production, marketing and support. Fig.2 : EGTS tested Prototype System architecture EGTS System description The EGTS architecture of the prototype system tested on Safran A320 aircraft comprise the current Auxiliary Power Unit (APU) generator to power the Auto Transformer Rectifier Units (2xATRU’s) that convert 115 VAC toVDC and supply Motor Controller Units (2 x MCU). The MCU control Wheel Actuators (2 x WA) installed on each Main Landing Gear (MLG) through Pilot command and control laws transmitted by a cockpit panel and an EGTS Controller (EGTSC). The MLG was chosen to maximize performance traction and agility and will allow to operate the aircraft on any type of taxiway condition – rain, ice or snow where greater tire ground friction is required The Power Electronic boxes will be located on the rear part of the fuselage close to the APU generator for the ATRU. The MCU will be located in the cargo bay on the left side of the fuselage close to the L/G Bay. The EGTSC will be located in the avionic bay. EGTS System operation 20 Pilots and 18 airlines from all over the world have had the opportunity , from 4 to 6 March 2014, to evaluate and assess the various functions of the EGTS including Pushback from gate, Nose-in from taxiway to the gate, active runway crossing, various taxi profiles at 5, 10 and 20 Kts on Toulouse airport taxiways. All the feedbacks were very positive and the system found easy to handle and the aircraft more responsive. Fig.3 : EGTS equipment location on aircraft EGTS future system evolution Based on the recent lesson learnt, trade off and technologies developed in Clean Sky 1 System ITD, “Smart Ground Operation” work package, Safran has decided to push and to mature those new technologies in Clean Sky 2 up to a TRL 6 Product development level. These technologies are driven by higher integration of the EGTS system with the aircraft systems and interfaces like APU (ATA49) Electrical generation and distribution (ATA 24) and L/Gear (ATA 32) and will be based in particular on: Direct Drive actuator/motor, and Energy recovery and storage system for EGTS boost application, emergency functions and limitation of the total installed aircraft power. EGTS future aircraft operation evolution In parallel to these EGTS architecture evolutions, the JV is working as well since several years on aircraft environment indication and airport awareness and automatic guidance on Airport, this open also for new opportunities for cost reduction and higher airport efficiency. Conclusion The current EGTS system as described earlier brings already significant savings for the airlines, the introduction of future EGTS evolutions under study by EGTSi will even bring a new leap in savings for airlines and greener aircraft operations by optimized aircraft power energy and better overall system integration.