Skymaster Forum - Pressurization outflow valves

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Bhump

03-26-25 08:48 AM

Pressurization outflow valves

Trying to find a leak in a 1973 pressurized skymaster for a friend. I am running pressure air thru front engine access with electric blower. In theory with master power off the outflow valves should be normally closed. However I have full air blowing out the outflow valve and backup outflow valve. Does this make sense?

hharney

04-02-25 06:20 PM

It's standard Cessna so most Cessna shops that work on P models should be able to help you with that. Not sure if there's a process listed in the service manual, do you have the SM? Can send if you need one

Ed A	04-03-25 08:08 PM

CPA Tech Note No. 337T-01

1 Attachment(s)

According to Tom Carr the outflow valves have to be blocked off.

See the attachment below.

mshac

04-05-25 01:54 PM

Nice find, Ed! :cool:

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