From: rna@leland.Stanford.EDU (Robert Ashcroft) Date: 21 Nov 94 13:18:57 Organization: Stanford University, CA 94305, USA Followups: 1
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A Pratt and Whitney employee sent me the following to be posted: I'm responding by e-mail since my access to the Net is at the moment read-only. Perhaps if you find my comments of interest, you'll post them. GE actually has two separate sets of problems with the GE-90. The one you spoke of involves their petition to change the rules with respect to certification requirements. One requirement is to explosively fail a fan blade while the engine is operating at max power. The traditional way to do this is to blow the blade root apart. P&W has done this and Rolls Royce expects to soon, if they haven't already. GE wants to fail the blade further away from the center of the engine. Much less mass, so less energy released. Speculation is that they gotta have the waiver, because they know they cannot pass the old test. In addition, they are way behind in their experimental test plan, because parts in their test engines keep failing. The most recent major failure was in the lenticular seal between (I think) th\e high and low turbines. I must declare an interest: I'm a 20 year employee of P&W, and I am truly outraged at what GE is trying to do with the FAA on this fan containment test.