![airframe - Why does the CF6/CFM56 Turbofan Fan Frame contain 12 circular holes between the primary and secondary flow? - Aviation Stack Exchange airframe - Why does the CF6/CFM56 Turbofan Fan Frame contain 12 circular holes between the primary and secondary flow? - Aviation Stack Exchange](https://i.stack.imgur.com/cREg4.jpg)
airframe - Why does the CF6/CFM56 Turbofan Fan Frame contain 12 circular holes between the primary and secondary flow? - Aviation Stack Exchange
![aircraft design - What is the difference between variable and transient bleed valves? - Aviation Stack Exchange aircraft design - What is the difference between variable and transient bleed valves? - Aviation Stack Exchange](https://i.stack.imgur.com/0DObA.png)
aircraft design - What is the difference between variable and transient bleed valves? - Aviation Stack Exchange
Research on Fault Diagnosis Method of Civil Aviation Engine Variable Bleed Valve System Based on Artificial Immune Algorithm
![aircraft design - What is the difference between variable and transient bleed valves? - Aviation Stack Exchange aircraft design - What is the difference between variable and transient bleed valves? - Aviation Stack Exchange](https://i.stack.imgur.com/pwwDx.png)
aircraft design - What is the difference between variable and transient bleed valves? - Aviation Stack Exchange
![What Is a Variable Bleed Valve (VBV)? | GEnx Turbofan Engine - Gas Turbine Engine - Jet Engine - YouTube What Is a Variable Bleed Valve (VBV)? | GEnx Turbofan Engine - Gas Turbine Engine - Jet Engine - YouTube](https://i.ytimg.com/vi/f38231naFpA/maxresdefault.jpg)
What Is a Variable Bleed Valve (VBV)? | GEnx Turbofan Engine - Gas Turbine Engine - Jet Engine - YouTube
![Schematic of pneumatic bleed valve assembly used on aircraft engines... | Download Scientific Diagram Schematic of pneumatic bleed valve assembly used on aircraft engines... | Download Scientific Diagram](https://www.researchgate.net/publication/255713466/figure/fig1/AS:309916842643459@1450901341575/Schematic-of-pneumatic-bleed-valve-assembly-used-on-aircraft-engines-Ref-2.png)