Vacum system
Forum rules
You must be a member of the Cessna 120-140 Association in order to post new topics, reply to existing topics, or search for information on this forum. Use the "Join" link in the red menu bar.
You must be a member of the Cessna 120-140 Association in order to post new topics, reply to existing topics, or search for information on this forum. Use the "Join" link in the red menu bar.
-
wolverine1371
- Posts: 1
- Joined: Thu Dec 12, 2024 1:22 pm
- Name:
- Aircraft Type:
- Occupation-Interests:
- Contact:
Vacum system
Currently have a vacum pump on my 120. Can I convert back to venturi's? Or add the external venturi's and be able to turn them off via a ball valve as a back up? Kinda like the look of the external venturi's. I can't find the part numbers in the IPC for the 3 venturi's.
-
6643
- Posts: 2461
- Joined: Tue May 01, 2018 7:00 am
- Name: John C
- Location: KLCI, NH
- Aircraft Type: 1946 C140/C90
- Occupation-Interests: A&P, semi-retired
- Contact:
Re: Vacum system
There were no vacuum gauges offered as options on the 120/140s. You can find venturis at places like Univair or Aircraft Spruce. You may find their performance lacking. Quite frankly, if you already have a working system, and you want them for looks, go ahead and stick them on, but I wouldn't even bother to hook them up.
Why three? Get an electric T&B for redundancy. You can fly needle, ball and airspeed with a total vacuum failure, and you can fly off the vacuum instruments with a total electrical failure.
A 9 inch venturi should run a DG and AH. If you want two (one for each side) get two 4" venturis.
Is your plane certified for IFR?
Why three? Get an electric T&B for redundancy. You can fly needle, ball and airspeed with a total vacuum failure, and you can fly off the vacuum instruments with a total electrical failure.
A 9 inch venturi should run a DG and AH. If you want two (one for each side) get two 4" venturis.
Is your plane certified for IFR?
John Cooper
www.skyportservices.net
www.skyportservices.net
-
4004
- Posts: 245
- Joined: Tue May 01, 2018 7:00 am
- Name: Edd
- Location: KFGU TN
- Aircraft Type: 140
- Occupation-Interests: Retired
- Contact:
Re: Vacum system
There you go, John- showing your age with that "needle, ball and airspeed" stuff! 
The "dible" made me do it again.
Merry Christmas to all.
The "dible" made me do it again.
Merry Christmas to all.-
6643
- Posts: 2461
- Joined: Tue May 01, 2018 7:00 am
- Name: John C
- Location: KLCI, NH
- Aircraft Type: 1946 C140/C90
- Occupation-Interests: A&P, semi-retired
- Contact:
Re: Vacum system
It's the way I was learned!
Merry Christmas to all!
John Cooper
www.skyportservices.net
www.skyportservices.net
-
6183
- Posts: 354
- Joined: Tue May 01, 2018 7:00 am
- Name: Mike Smith
- Location: Florida
- Aircraft Type: 140A (2) 1949 & 1950
- Occupation-Interests: Retired aerial power line patrol pilot for Gulf Power Co. CFIA, CFII, MEI
120-140 Assoc. Florida Rep. N9633A & N9688A - Contact:
Re: Vacum system
I thought John was more familiar with one of these.
- Ercoupe.jpeg (5.64 KiB) Viewed 531 times