PT6 compressor stalls

I *think* it would be open because it's mounted on the side of the engine so gravity won't close or open it and since it would be open at idle at start-up or shutdown.
 
cmill said:
just curious, at what power setting was this? I also know that on caravans they can compressor stall if you leave the ground heat on, but they shouldnt be stalling at anywhere near cruise power settings.
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Please explain how this would cause a stall. I've not heard of this....
 
dustoff17 said:
Please explain how this would cause a stall. I've not heard of this....
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Ughhh, I've had a few to drink, and only had this explained to me once, so I apologize. But something to do with the bleed valves being closed with the heat on, and this too much air being forced through the compressor.

Once again, take the explanation with a grain of salt. I'm sure someone can explain it more accurately.
 
cmill said:
Ughhh, I've had a few to drink, and only had this explained to me once, so I apologize. But something to do with the bleed valves being closed with the heat on, and this too much air being forced through the compressor.

Once again, take the explanation with a grain of salt. I'm sure someone can explain it more accurately.
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I know there are a LOT of PT6s out there but in the Caravan with everything working correctly (no broken lines, parts, etc) this will not cause a compressor stall. I talking ground operations (idle) going to a takeoff torque setting.

If at idle, you set the bleed air on, the air mixing to ground AND had the cabin/firewall shutoff valve pulled OUT, THEN accelerated for takeoff, you would get a compressor stall. With this Caravan's system, that's about the only way to get it using cabin heat.
 
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