APU 85-129 Performance problems due to cracked combustor case. 737-3/4/500

When you do an APU performance check on a 85-129 APU, or whenever inspecting it for leaks when its running, pay special attention to the combustor case. It can happen that this housing is cracked at the welded area. This causes a big air leak and even the flames are visible through the crack! But this same crack is hardly visible when inspecting it when the APU is not running. See picture below of such an event where you can see the flames in the combustion chamber.


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.