Date: 11 Feb 98 04:26:33 From: "Matthew Lehde" <email@example.com> Organization: EarthLink Network, Inc. References: 1 Followups: 1 2 3
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jf mezei <"[non-spam]jfmezei"@videotron.ca> wrote in message ... >OK. We know that centre fuel tank exploded. And 1.5 minutes prior to >that explosion, there is a "crazy fuel flow indicator" for an engine. >Couldn't the initial problems not have been caused by an electrical >problem which eventually sparked the explosion ? I don't think this could be the cause of the explosion... A fuel flow indicator would probably be located out on the engine. If it sparked, the wing would have blown up first. >Could someone put this "crazy fuel flow indicator" in perspective ? Is >this something which is as common as someone sneezing and considered >perfectly normal ? I doubt it's very serious. When I was fueling airliners they would have inop fuel (level)guages every once in a while. Just inconvenient... Lots of extra calculations. Of course it's possible that there may have been a fuel pump failure on that engine, but that would only result in power loss and engine shut-down. Not a CWT explosion. Most likely a guage malfunction. >Also, what exactly did the pilot mean by "where this thing's trimmed" ? That is in reference to the trimming of the flight controls to "trim" the airplane to fly level and at the desired pitch. After fuel,cargo, and passengers are loaded and the doors are closed. weight and balance calculations are done to determine the proper trim setting for the horizonal stabiliser. If this setting is incorrect it could cause under or over-rotation on take-off resulting in a catostrofic runway overrun or a stall immediately after rotation. The aircraft trim may have been off slightly requiring the pilot to apply forward or back pressure on the control yoke. This doesn't seem like a big problem to me since they had flown all that distance with no problems. It was probably just annoying... Hopefully an airline pilot will respond... I'm not one yet. >Also, how is fuel distributed to each engine ? On the 747-400 with the automated fuel system during take-off each engine draws off its own wing tank, and after flap retraction draws all fuel from the CenterWT. After the CWT is empty it feeds from the Main 2 & 3 tanks... Main 1 is between Engine 1 & 2, main 2 between Eng 2 and the CWT, main 3 is between the CWT and Eng 3, main 4 is between Eng 3 & 4. Small reserve tanks are outboard of Eng 1 & 4. After 2 & 3 are down to the same level as 1 & 4 each Eng feeds from its own tank. Of course on a 747-100 the fuel distribution is controlled by the flight engineer, but I think on take-off and landing it's standard the for the Engs to feed off their own tanks. >Last question: with a wing tank almost full, what would happen if a pump >in centre fuel tank were to start to pump air/fumes from an empty centre >tank to a wing tank If air/fumes were pumped into the wings it would just go out the fuel tank vents, wouldn't it? Hopefully some airline pilots will respond. The main cause of the crash was the navy missile tearing through the fuselage just forward of the CWT and the resulting rapid decompression. [Moderator's Note: The bit about the missile is of course totally unsubstantiated speculation, not fact as implied. -- Karl] firstname.lastname@example.org matt lehde IF IT'S NOT BOEING I'M NOT GOING!