gmac Posted March 24, 2011 Share Posted March 24, 2011 On a B model (no reservoir bypass) - During travel of flight controls or gear, utility pressure drops below 1000psi and both EDP and suct boost lites illuminate. NOT an indication problem (gear/flaps fails time check). EDPs, boost pump, boost pump supply hose, boost pump press switch,accumulator, relief and ground test valve changed out to no effect. Firewall valves check good. No mule available (hey, if it was easy....). Thoughts? Quote Link to comment Share on other sites More sharing options...
victorp1 Posted March 24, 2011 Share Posted March 24, 2011 If it happens with gear or flaps movement you may want to check the flow regulators. To check the landing gear you will need to actuate only one at a time, so pin/ground lock the other two. The only time I had this was when one MLG flow regulator failed to full flow and utility pressure dropped to about 1500 PSI. Vic Quote Link to comment Share on other sites More sharing options...
RavenFE Posted March 24, 2011 Share Posted March 24, 2011 You say the gear/flaps fail time check; slow or fast? Have you checked/replaced the reservoir vent line filter? Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted March 24, 2011 Share Posted March 24, 2011 Hey Vic hows Fl? We had a bad flow reg and one gear would drop then the other... Do your warning lights come on and stay on for the entire extension or do they come on and quickly go out? Cycle the gear or flaps and see if you resevior level drops significantly then recovers. If you tie the Aux system and run the flaps does your pressure drop off the Aux pump? Quote Link to comment Share on other sites More sharing options...
gmac Posted March 24, 2011 Author Share Posted March 24, 2011 Slow. Vent line filter about the only thing not replaced- I'll check it, thanks Quote Link to comment Share on other sites More sharing options...
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