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#1
May 30th 04, 03:35 PM
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Vacuum pressure
At what rpm do people see their vacuum pressure drop below an acceptable
level(3.2?). I also have a standby vac with a low vac pressure red warning light. When I reduce power to 1200-1300 rpm the vac pressure drops off and the red light comes on. I thought in the past the pressure would hold until around 1000 rpm. Does this seem to be working properly? TIA, Pete 
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#2
May 30th 04, 03:54 PM
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Most of the 172R's I have flown don't show Vacuum in the green below 1200
rpm.
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#3
May 30th 04, 05:48 PM
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Peter MacPherson wrote: At what rpm do people see their vacuum pressure drop below an acceptable level(3.2?). I also have a standby vac with a low vac pressure red warning light. When I reduce power to 1200-1300 rpm the vac pressure drops off and the red light comes on. I thought in the past the pressure would hold until around 1000 rpm. Does this seem to be working properly? That's about the same as my Maule ('cept I don't have a warning light). George Patterson None of us is as dumb as all of us.
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#4
May 30th 04, 10:19 PM
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"Peter MacPherson" wrote in message
news  qluc.14569$3x.7535@attbi_s54...At what rpm do people see their vacuum pressure drop below an acceptable level(3.2?). I also have a standby vac with a low vac pressure red warning light. When I reduce power to 1200-1300 rpm the vac pressure drops off and the red light comes on. I thought in the past the pressure would hold until around 1000 rpm. Does this seem to be working properly? TIA, Pete I don't get into the green on my C152 until I'm at 1200 RPM or so, but some of the 172's at the local flight school will hold 5 at 1000 RPM just fine. -- Louis L. Perley III N46000
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