UltraJohn wrote:
nafod40 wrote:

Jim Carriere wrote:
This is one of those questions where there must be a simple answer. This
is probably the forum to get the best explanation.

Why aren't vacuum driven gyro instruments driven by pressure instead?



Some systems ARE designed to work off of pressure. Depending on the system
designer.
John

If the carbon vanes in a vacuum pump fail, any debris will be blown
overboard. If the pump pressurizes the instruments, the debris will be
blown into the instruments, ruining them.