I began my flight training in a Cessna 120 with 2 venturis as the source of vacuum for my DG and TC. They worked well in flight.

Are there any aircraft with deployed/deployable venturis out there? Other than my 1946 vintage C-120 which is also my birth year.


Not as far as I know. Even Vacuum pump systems are quickly becoming a thing of the past. Electric AI's are available and I have seen plenty in use. However with glass cockpits making their way into general aviation AHARS units are becoming more and more common place over traditional vacuum systems. There are even some small drop in units intended to replace traditional vacuum systems like DG's and Attitude Indicators. Venturi vacuums, while simple have down sides like potential icing risks and needing sufficient airflow to function.

| improve this answer | |
  • $\begingroup$ A complete electrical failure in a non battery powered backup AI would still require a vacuum source. Although I must admit the venturi became less visible on aircraft as I advanced through many different models through the years, until the complete absence in 'modern' IFR capable aircraft. $\endgroup$ – Mike Brass Mar 17 '18 at 4:30
  • $\begingroup$ @mikebrass that is incorrect, to be certified as a backup electric AI the unit must have a second independent power supply not driven by the main system typically this is an internal backup battery but can be fed off a second electrical system in a twin engine scenario. $\endgroup$ – Dave Mar 17 '18 at 18:18

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.