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Comanche Engines and Propellers
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26/04/2020 11:28 pm
Vacuum Pressure
by Gene Ridder » Fri Aug 31, 2012 8:40 pm
Had low vacuum pressure today mid way through a flight. During runup it was good at 5.5" then the primary vacuum pump failure light came on in cruise, the vacuum press was at 3" at 4500'. Any quick things to check?
Gene Ridder- Posts: 14
- Joined: Fri Mar 16, 2012 2:04 am
- Location: NW Indiana
Re: Vacuum Pressure
by Zach Grant L1011jock » Fri Aug 31, 2012 11:01 pm
Bad vacuum regulator or plugged filter? You also could have had a hose spring a leak downstream of the gauge and cause a decreased indication.
-Zach
-Zach
"Keep it above 5 feet and don't do nuthin dumb!"
Zach Grant L1011jock- Technical Advisor
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Re: Vacuum Pressure
by Gene Ridder » Sat Sep 01, 2012 1:28 pm
Where is the filter and is it easily accessible?
Gene Ridder- Posts: 14
- Joined: Fri Mar 16, 2012 2:04 am
- Location: NW Indiana
Re: Vacuum Pressure
by Zach Grant L1011jock » Thu Sep 06, 2012 7:58 pm
Should be under the panel, or mounted on the cabin side of the firewall. It looks like a small cyl. filter with mesh covered white filter media.
-Zach
-Zach
"Keep it above 5 feet and don't do nuthin dumb!"
Zach Grant L1011jock- Technical Advisor
- Posts: 1404
- Joined: Mon Mar 22, 2004 4:35 pm
- Location: Indianapolis KEYE
Re: Vacuum Pressure
by Gene Ridder » Thu Sep 06, 2012 8:13 pm
Sheared shaft, replaced with Tempest overhauled unit. Good to go.
Gene Ridder- Posts: 14
- Joined: Fri Mar 16, 2012 2:04 am
- Location: NW Indiana
Re: Vacuum Pressure
by Zach Grant L1011jock » Mon Sep 10, 2012 2:30 am
Shouldn't have been ANY vacuum with a sheared shaft. Glad you got it fixed.
-Zach
-Zach
"Keep it above 5 feet and don't do nuthin dumb!"
Zach Grant L1011jock- Technical Advisor
- Posts: 1404
- Joined: Mon Mar 22, 2004 4:35 pm
- Location: Indianapolis KEYE