18 Nov 2025, 04:38 [ UTC - 5; DST ]
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Post subject: Re: Pressurizing C421 cabin on the ground with a vacuum.  Posted: 27 Sep 2015, 21:44 |
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Joined: 05/04/11
Posts: 521
Post Likes: +120
Location: Covington, GA
Aircraft: 421C, 58
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I have used two shop vacs, one on each engine, to pressurize a C90. It was enough to find leaks at the heater, door seal, and wing roots.
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Post subject: Re: Pressurizing C421 cabin on the ground with a vacuum. Posted: 27 Sep 2015, 23:00 |
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Joined: 01/18/11
Posts: 7664
Post Likes: +3697
Location: Lakeland , Ga
Aircraft: H35, T-41B, Aircoupe
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After plugging all the holes, I could get 2.5 psi with two leaf blowers.
We even had smoke coming around the windshield screws.
Backed em out a bit ar put just a wee bit of pro seal. Pretty well buttoned up tight now.
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