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#1
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Liberty XL2 has the Continetal IOF 240 with FADEC. Would the engine run if
the batteries failed? It does not have a magneto. Would the ignition system run off of the alternator? The salesman at Sun-n-fun had no clue. Does anyone know? |
#2
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Liberty XL2 has the Continetal IOF 240 with FADEC. Would the engine run if
the batteries failed? It does not have a magneto. Would the ignition system run off of the alternator? The salesman at Sun-n-fun had no clue. Does anyone know? I would think that it would run for a little while but an alternator needs a source of electricity for the field and this comes from the battery. There must be some sort of redundancy in the ignition system. I would think there is a second smaller battery intended to allow the system to run in the event of a main battery failure. Can't see it being certified otherwise. |
#3
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On Fri, 7 May 2004 21:58:59 -0400, "Piperflyer"
wrote: Liberty XL2 has the Continetal IOF 240 with FADEC. Would the engine run if the batteries failed? It does not have a magneto. Would the ignition system run off of the alternator? The salesman at Sun-n-fun had no clue. Does anyone know? FADEC and LASAR systems have small computers that control the timing and in the case of FADEC, mixture. These computers must have a source of voltage to run. Having said that, I know the mags in the LASAR system can fall back and run like a standard magneto if the LASAR system goes down. This allows the plane to complete the flight after an electrical failure. Not sure about the FADEC, but I have a hard time believing the FAA would certify an engine that fails b/c of an electrical failure. At a minimum, I expect that FADEC engines would require a backup battery system to run the FADEC. I searched the Continental website and found the following, article, which indicates a FADEC system ran for 'two hours after primary power failure'. The article leaves out a lot of details, like how the two hours of flight were achieved (ie secondary battery system, or mag-like fallback). http://www.tcmlink.com/pressreleases/august191999.html -Nathan |
#4
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![]() "Piperflyer" wrote in message ... Liberty XL2 has the Continetal IOF 240 with FADEC. Would the engine run if the batteries failed? It does not have a magneto. Would the ignition system run off of the alternator? The salesman at Sun-n-fun had no clue. Does anyone know? Are you sure there is no magneto? The LASAR has the mags. If my LASAR fails, they just keep going. The pilot gets an ignition warning light, and the RPM's drop a little, but it keeps going just fine. |
#5
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When I went to A&P school, I remember that the L-1011 had partially
electronic engines (the R-R RB211): they were mechanical up to 92% or so power and fuel flow was modulated from there. In the event of total electrical or ECU failure you had power fully throttleable from idle to approximately 92%. My father was an L-1011 F/E and F/O and he says that's as he remembers it, but he no longer has manuals. We were taught that FADEC engines-turbines, that is- had redundant computers but in case of total electrical failure the engine would stay at its last power setting but with changes in altitude or airspeed you would get power changes because fuel flow would be constant. Your only option would be to shut off fuel flow by a manually actuated valve, if there was one. It would be very easy, in the case of recips, to just use the EEC to trim the existing ignition and fuel injection systems instead of going to full electronic option. I don't know why that option isn't pursued, or the replacement of _one_ magneto with an electronic system. Common sense, it would seem. I do think single pilot IFR with passengers should require single lever power control. I've thought that for twenty years. Otherwise, make 'em carry a rated pilot or a Piston F/E in the right seat. (I got my 727 F/E rating before my private ticket-privilege of being an A&P-did little good though, but used up my GI Bill benefits in a fun way.) |
#6
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The salesman did tell me that the engine does not have magnetos.
"Dude" wrote in message ... "Piperflyer" wrote in message ... Liberty XL2 has the Continetal IOF 240 with FADEC. Would the engine run if the batteries failed? It does not have a magneto. Would the ignition system run off of the alternator? The salesman at Sun-n-fun had no clue. Does anyone know? Are you sure there is no magneto? The LASAR has the mags. If my LASAR fails, they just keep going. The pilot gets an ignition warning light, and the RPM's drop a little, but it keeps going just fine. |
#7
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There are two batteries, A and B. A preflight check of both batteries is
required. Battery A is the normal ship's battery and B is dedicated to running only the FADEC in the case of alternator failure. The switchover is automatic but can also be accomplished manually. Somewhere in my notes is an indication of how long it will power the FADEC, but I can't seem to find it just now. "Piperflyer" wrote in message ... Liberty XL2 has the Continetal IOF 240 with FADEC. Would the engine run if the batteries failed? It does not have a magneto. Would the ignition system run off of the alternator? The salesman at Sun-n-fun had no clue. Does anyone know? |
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