[ercoupe-tech] Vacuum line plumbing

[nm0l]

When I purchased my 415-C years ago I found the attitude ind. inop. Taking it 
out to have 
it repaired I discovered it hooked up backwards! A lot of the old military type 
instruments 
were designed to run on air PRESSURE or VACUUM. The pressure port was marked 
"air 
inlet" so apparently this is where some "installer" put the vacuum line. So 
therefore the 
gyro was trying to run in reverse. Air Inlet is were the static air ENTERS!  
After reversing 
the hoses the old gyro worked fine. But as pointed out you MUST have a 
regulator or else 
the gyro(s) will not run at the proper speed. T&B only needs 2.5 inHg. if 
memory serves 
me. Craig 9772M