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Brent-
Could you elaborate? I assume this is a "standby" system with a second regulator. Where is the regulator mounted? Outside the cabin or inside? I initially wanted to mount my regulator and filter inside the cabin on my main system, thinking the inside pressure would "help" the pump, but was told all that would do was make the pump work harder, and everything has to be outside the cabin. I know I'm missing some concept here. Can you help? Thanks.
Having said that, I did have the opportunity to design a vacuum system
for a friends IV-P. He wanted a flight director so a vacuum system was a
must have. I configured it with a vacuum regulator, filter and a small
sonic venturi so that the system used filtered cabin air and discharged
into the engine compartment. The advantage to this configuration was
that when the vacuum pump failed (not IF) the cabin pressure would run
the system. Free standby vacuum, works great. The bad news is that you
have to watch for a vacuum flag when you transition to unpressurized
flight in case the pump went T.U. in cruise.
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