Example of ACMS data that shows a failing precooler control valve sensor 390 F. 737-ALL

Below you find 2 pictures of ACMS data from the same aircraft, in which the 390 F sensor of the precooler control valve failed. You can see how the PRSOV is closing and making the bleed duct pressure lower and lower. After replacement of the sensor, the ACMS data shows a correct duct pressure again, proving that the 390 F sensor is working correctly and opening the PCV to cool the bleed air. The 390 F sensor was replaced after the bleed air health check was performed iaw amm, and all other parts where found working ok. The 390 F and 450 F sensors are not tested with this test. They have a special shop-test which cannot be performed during normal aircraft maintenance and troubleshooting. Experience learns that this sensor is often defective. Thanks to Ferry B. for his input !

 

> FOR INFORMATION ONLY. UNCONTROLLED DATA !.

Sjap.nl uses cookies to use the content and ads for functions to analyze website-traffic. Sjap.nl also shares information about your usage on this site with our partners for social media, ads and analysis. By continuing to use this site, you agree to the use of cookies. More information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

More information about our privacy policy and cookies, see the Privacy Policy & Cookies page.

Click here to read more about how Google uses data when you use our partners' sites or apps.

Close