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Aviation History
1990
1990 - 0084.PDF
TECHNICAL: PROPULSION PW2000 EROPS given clearance The Pratt & Whitney PW2000 engine has been granted Federal Aviation Administration (FAA) 120min extended range operation (EROPS) certification. EROPS certification is a mea sure of an engine's reliability and permits operation of twin-en gined aircraft such as the Boeing 757 over routes taking it 120min from the nearest airport. P&W says that the engine is on course for 180min certification later in the year, bringing it within reach of the Rolls-Royce RB211-535E4 which gained its 180min EROPS certificate last year from the UK Civil Aviation Authority. The PW2000 entered service on the 757 in 1985, and the company claims that it has cap tured 59% of the engine market on that aircraft. P&W says that the engine has more than a 7% fuel-burn advantage over its competition, allowing operators to fly larger payloads over longer distances than they could with EROPS approval gives PW2000-powered 757s greater flexibility other engines. Rolls-Royce says that it has more than 70% of the 757 customers and offers six times the reliability record of the PW2000. In engine terms, R-R claims to have 52% of the firm business for all 757s. R-R expects to gain full 180min EROPS clearance for the 757/RB.211-535E4 combination following flight testing with a 757 by mid-year. The engine incorporates a full- authority digital electronic con trol to simplify engine operation. • Pratt & Whitney Canada move to resolve PW100 problem Pratt & Whitney Canada (P&WC) has resolved a potential hazard relating to its PWlOO-series engine. Details of the problem have surfaced in Transport Canada's service diffi culty alert, a high-grade notifica tion which warns of possible dangers. During shop visits, cracks BOEING LINES UP CFM-56 CONTRACTS Three versions of CFM-56-powered Boeing 737s, a 300, a 400 and a 500 series, pictured recently. The 1,000th aircraft equipped with CFM 56 high- bypass turbofans to be delivered to a customer, a Boeing 737-400 ofUSAir, was accepted on 7 December at Boeing Field, Seattle, Washington. CFM International, the joint company formed by General Electric and Snecma, has delivered 3,400 engines to power commercial and military aircraft. have been found in the engine fuel-pump spur gears, states the report. Approximately 40% of P/N 3100986-01 five-web gears have been found to be cracked, some with faults in as many as three of^he five webs. A failure of this gear would cause an inflight shutdown, although this has not occurred. P&W says that it has told operators to inspect the gear for cracks and that the company will send engineers to change the gear if necessary. If two of the five webs are found to be cracked, then the whole gear needs to be changed. The com pany says that the part is easy to reach and replace. "We have got a handle on this problem," insists Ron Trumper, P&WC PW100 technical sup port manager. • In the lower-grade service difficulty advisory, Transport Canada brings operators' atten tion to the possibility of compressor failures on the Alli son 250-C20-series engines due to erosion or corrosion of compressor vanes and blades. • Cam T-90 bids for FAR-33 C anadian Airmotive has up graded testing on its Cam Turbo-90 (Cam T-90) three-cyl inder, four-stroke turbocharged engine from National Associ ation of Sport Aircraft Designers standards to the US Federal Avi ation Authority FAR-33 stan dard. This is a 150h endurance run and is the certification stan dard for general-aviation aircraft engine. The company has also an nounced that it has redesigned the engine's ignition system from the former layout of three in dependent systems (one for each cylinder) to two fully indepen dent systems, each of which con trols all three cylinders. Canadian Airmotive claims that the engine combines low weight with low fuel consump tion. The engine features a heavy-duty four-main-bearing crankshaft, forged turbo-pistons with floating pins and stainless- steel top piston rings. It produces maximum power at a lower rpm than two-strokes at 5,300 rather than 6,500. • NASA in rocket engine contract NASA's Lewis research centre has opened talks with Pratt & Whitney government engine business group over a contract to design two advanced expander- cycle testbed rocket engines. Estimated value for the five- year cost-plus-fixed-fee contract is $32.5 million, with the award anticipated this April. Pratt & Whitney will design an advanced, high-performance, long-life, hydrogen/oxygen expander-cycle testbed rocket engine. It will fabricate, assemble and test the engine components to verify the procedures used in the design of the engine. The components will then be assem bled into two engine testbeds. They will be acceptance-tested and delivered to Lewis. The engine testbeds will be used to develop technologies for advanced chemical propulsion systems to support future US space exploration goals. • 26 FLIGHT INTERNATIONAL 17-23 January 1990
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