In a recent article published at www.onlinejournal.com Karl Schwarz claims the engine parts photographed at the Pentagon crash site on 911 are not from 757 powerplants or the 757 APU (APU = auxiliary power unit, a small turbine engine in the aircraft tail that provides auxiliary power to the aircraft while on the ground and in emergencies etc) rather they are from a much earlier turbojet model eg the P&W JT8D used in early model 737s and the USAF A3 Skywarrior. If there are any A&P mechanics who have worked on the 757s and/or early turbojets like the JT8Ds it would be interesting to hear their comments.
They are all jet engine components (past and present) on the A-3 Skywarrior twin-turbojet airplane and on older versions of the 737. The USAF only has a few of the A-3s left in operation and what was formerly Hughes Aircraft, now Raytheon, has a fleet of them at Van Nuys, Calif. This type of turbojet engine has never been used on a Boeing 757, so the debate on "type of plane" can end there. This is a jet engine component with fan, not an auxiliary power unit (APU) as some have speculated or dropped into the conversation as disinformation.
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If you have seen the Pentagon photos that have been released regarding the jet engine part inside the Pentagon, the following is also a photo that is not part of a 757 engine that we have found, even in physically inspecting one inside a jet engine maintenance shop.
They are called in the jet industry a "diffuser case" and the UPN content numbers on this particular item have been blocked and otherwise scrubbed on the Internet.
However, the following is the diffuser case design for the 757 jet engines and it is quite different from that shown at the Pentagon. That is due to the difference between "dual-chamber turbojet" versus the newer "high bypass jet fan" designs found on the 757 and 767 jet airplanes.
Note the triangular bezels around the openings and then note that the Pentagon diffuser case has no such openings or reinforcing points. The diffuser is built into a much larger component and not a separate component in the newer 757 type jet engines. This is a very large component within the 757 type of jet engine and there are two of them on every 757. Note, not a single one of these was found at the Pentagon and this is not a component that would have melted or evaporated in any manner at all.http://www.onlinejournal.com/Special_Reports/020205Schwarz/020205schwarz.html