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jan.mevis(at)informavia.b
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 Posted: Mon Jul 19, 2010 4:40 am Post subject: a very good lesson learnt |
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Yesterday I almost got sliced up in small pieces when turning the prop of a Yak 52, before starting. The mags were off, someone was in the cockpit, but nevertheless, the engine started, unexpectedly.
It scared the hell out of me, but it was my own fault. I had been working on the left mag, and simply forgot to put the P-lead back.
Unacceptable, of course, and very stupid, I agree. This never should have happened. I probably was distracted when working on the engine.
Because I did not expect (or want) the engine to start, I was standing very close to this big propeller.
I’ve learnt my lesson, and I hope that this bad experience may help others being more cautious than I was.
BR,
Jan Mevis
YK52 RA1453K
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dsavarese0812(at)bellsout
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| Posted: Mon Jul 19, 2010 5:33 am Post subject: a very good lesson learnt |
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Excellent lesson Jan and thank goodness you were not injured. To add to your "lesson", if the engine were started normally, you would have had a big dilemma when it came to shutting it down. You WOULDN'T have been able to shut the engine off using the standard procedure. ie: turning off the mag switch
Since we know what it takes to keep the engine running.....air, fuel and spark.....if you can't shut off the spark (P-lead disconnected from one mag) , that leaves air and fuel. So you pull the red fuel shut off lever to shut the fuel off from the engine. Ahhh.....that should do it. Right? Yes, it should, but what happens if it doesn't shut the fuel off? Have you tested the fuel shut off in your airplane recently? Or ever for that matter? You may have pulled the lever, but do you know if it shuts the fuel off?
Here's a little test you can perform to test the fuel shut off without the engine running. It should be done at least at every annual condition inspection.
- Pull the red fuel shut off handle to the rear
- Turn the primer pump to the SYSTEM side (turn to the left on a 52; to the right on a 50)
- Now pump the primer until you feel a hard backpressure which prevents you from pushing the primer pump in any further.
- While pushing on the primer pump, push the red fuel shut off handle forward.
- The primer pump should immediately push all the way in
This tells us the fuel is actually shut off between the coarse fuel screen and the fuel pump.
If you do not feel the hard back pressure while pumping the primer with the fuel shut off pulled to the rear, the fuel shut off at the coarse fuel screen is not shutting the fuel off completely. This will allow the engine to continue to run even with the red lever back and the mags turned off. Also if you do not feel the hard back pressure while pumping the primer with the fuel shut off, the fuel system may have a leak.
Remove the control cable from the fuel shut off lever and make sure the lever is at the stop in the shut off position. Now go back in the cockpit and repeat the primer pump test. Adjust the cable end to fit with the shut off lever in the fully closed position.
Also make certain the cable sleeve is not sliding in the cable sleeve clamps. If the sleeve moves, it may prevent the cable from shutting off the fuel completely.
Any questions, please ask. Hope this helps.
Dennis
p.s. Ask yourself what would you do if you couldn't shut the engine down by turning off the mags AND pulling the fuel shut off lever to the rear. I had to do this on two separate occasions.
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