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Aviation History
1996
1996 - 2461.PDF
TRENT BOO DESCRIPTION TheTrent 882 provides power to Cathay Pacific's Boeing 777s able units out of around 70. Secondly, die Trent 700 programme ran 12 months ahead of the - 800, so problems which cropped up on the first were dealtwith on the second. "We had a wish- list for both, but, because the -800 had those extra 12 months, it got more of the list," says Terrett. The air system, for example, is common to both Trents and similar to the RB.211. In the -800, however, carbon seals are used to control leakage of oil into the bearing chambers, as opposed to labyrinth seals on the -700. Changes were also made to the IP turbine cooling-air overheat detection system. In the - 700 no overheat warning is sent to the cockpit unless both thermocouples in the same assem bly read the same. In the -800 a failed thermo couple is disregarded if it indicates outside a set temperature range, leaving the other device still active. The Hispano-Suiza high-speed external gearbox has new features on the -800 including a single hydraulic pump supported by aircraft- Tie Trent 800 willpower the Boeing 777-300 on its first flight mounted hydraulic pumps which are powered both electrically and pneumatically. It also sup ports a variable speed constant frequency gen erator which is a back-up engine electrical generator. Another system, the fuel-oil heat exchanger, which heats the cold fuel from the wing tanks before delivering it to the engine, is basically common with the -700 but is mounted higher on the fan case for easier transportation. The oil system will also be fitted with carbon seals with a design life of 30,000h in place of the -700's labyrinth arrangement. The vibration monitor ing system has an additional pick-up and allows engine balancing using weights attached to the LP turbine as well as the fan disc. The thrust reverser is a different design to the one which gave many headaches on the Trent 700 because of problems with the tertiary lock system introduced late onto the engine after the Lauda accident. The Boeing-designed -800 sys tem uses translating cowls instead of the four tilt ing buckets on the Trent 700. The cowls are moved by mechani cally linked hydraulic actuators, which block bypass air and deflect it forward through turning cascades. "We were able to do hiuch more cyclic testing with this one, so we had a chance to get ahead of the game," Terrett says. Getting ahead of the game has become something of a mantra at the UK engine maker's Derby head quarters, where work on the next stage of the Trent programme, the 895, is now well advanced. J Fastener Specialist We supply rivets, blind bolts, self- locking nuts, clip nuts, anchor nuts, panel fasteners, tubular, internally threaded rivets, plus a complete range of installation and workshop tooling. Full engineering back-up is available , RXF REPUBLIC FASTENER ENE F.I.T., INC. FASTENER INNOVATION TECHNOLOGY Rivnut Engineered Products West Coast Aerospace r. •MSMM A.T.I. Industries \ Inc. OMEGA OMEGA TECHNOLOGIES INC. BRILES RIVET CORPORATION WESTERN SKY INDUSTRIES Molding Corporation ncas; We can also supply a full range of British, American and European Hardware. C J Fox & Sons Limited Shoreham Airport, Shoreham by Sea West Sussex BN43 5FN, England Telephone 01273 464046 Facsimile 01273 464577 FLIGHT INTERNATIONAL 11 - 17 September 1996 57
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