jluckey(at)pacbell.net
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 Posted: Sat Oct 26, 2013 5:50 pm Post subject: EXP 2 Bus workaround - Master Solenoid Failure |
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I really enjoy this what-if stuff, so here goes...
I'm referring to Bob's drawing sent out yesterday afternoon, Z-08_Full.pdf. It appears that people are touching on this issue but I have not seen it clearly stated.
Given:
1. Stated design goal: To be able to survive any single component failure w/ little or no drama.
2. Electrically-dependent engine
3. Engine/prop does not windmill, because of some kind of PSRU
4. You are flying w/ Engine A switch On
5. Engine B switch Off
Scenario:
1. You are in flight and Main Batt Contactor fails (coil burns up, loose wire, whatever)
2. Engine shuts down, prop stops
3. Pilot takes several seconds to gather his thoughts
4. Pilot turns Engine B switch On - power restored to engine systems except starter
5. Pilot hits starter button to re-light. Starter inop because failed Main Batt Contactor is in series w/ Starter Contactor.
6. Forced landing
7. Failure to meet design goal - single component failure causes forced landing 
8. Thanks for playing...
-Jeff
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