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Has anyone landed 914 on pump #1 run by generator only?

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rparigor(at)suffolk.lib.n
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Posted: Sun Dec 21, 2008 12:06 pm Post subject: Has anyone landed 914 on pump #1 run by generator only?

Curiosity question. Has anyone had a failure where the only way you could keep 914 running was by Europas schematic that has you wiring fuel pump #1 direct to generator?Thx.Ron Parigoris   [quote][b]

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paul.the.aviator(at)gmail
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Posted: Sun Dec 21, 2008 1:45 pm Post subject: Has anyone landed 914 on pump #1 run by generator only?

Hi Ron,



My pumps are wired as per the Europa drawings.  As I recall it has one

of the connected to the output of the regulator... I need to check

again for the exact details.



Anyhow, getting back to your question, yes, when I took a lightning

hit the main contractor dropped offline and all of my electrics with

it.



I did not turn on my E-Buss straight away, I spent a good deal of time

deciding how damaged the aircraft was, from a structural and flight

control perspective. Only after this did I turn on my E-Buss, so up

until then I was running off one fuel pump which was powered directly

from the output of the regulator.



So, I guess this is a long winded way of saying from a redundancy

perspective the system worked as designed.



I did see a number of postings from you on the AeroElectric forum, my

only recommendation I can make to you is to keep it simple.  I have a

single battery dual electrical buss in my airplane.  Never in my

imaginings did I consider if the design was robust enough to take the

punishment that was handed out that day, but it was.



Regards,  Paul

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budyerly(at)msn.com
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Posted: Mon Dec 22, 2008 12:34 pm Post subject: Has anyone landed 914 on pump #1 run by generator only?

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Ron,

 Wire the 2nd boost pump as the Europa manual and Rotax  Installation diagrams indicate is light and simple with good  redundancy.  The only deviations I do are in a dual generator setup when a  2nd battery and non tied bus is used (you could call it an E bus)  runs the other pump and associated emergency electrics.  The E bus  derives power from the rotax alternator, and the other pump off the main bus is  charged by the belt driven alternator.  My other is to have a single small  battery charged off a shot key diode which drives the secondary pump.   In the event of a primary bus failure, you have to turn on the secondary pump  and now have a 30 minute battery to get you on the ground. You can get into  endless number of what if's in these scenarios and become the office of  redundant redundancy.  

  

 Many are flying with both pumps wired to the main bus.  If the master  solenoid fails, and you use a relay to control the Rotax alternator, you  can loose fuel pump power permanantly if the main bus / master solenoid  fails.  

  

 The Europa/Rotax method is simple and it works.  

 Bud Yerly  

 [quote]   ---

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