Juan Posted December 8, 2017 Share Posted December 8, 2017 Hi there, During landing, it was a very smooth landing - 4 engines to Flight Idle, 1000/1200 PSI each. - 4 engines to Ground Idle, the torque is increased and no-reverse is experienced in four engines. - The power cannot be lowered and the landing run is made with between 5000/6000 PSI (GI) - Brakes are burnt The blades never went to reverse pitch, is it possible that because of the smooth landing the touchdown relay was relieved during a short "flotation" period (1 or 2 seconds) and it prevented the four propellers from going to reverse angle..? Juan Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted December 9, 2017 Share Posted December 9, 2017 What aircraft model? Quote Link to comment Share on other sites More sharing options...
victorp1 Posted December 21, 2017 Share Posted December 21, 2017 On the EPCS the backup solenoid is energized by the throttle position, lifting it up to come into the ground (beta) range. This is not normally tied into the touchdown electrical system. If the throttle cable breaks and takes the engine/propeller linkage to the reverse position the backup solenoid will not allow the blade angle to decrease below low pitch stop position as long as the throttle remains in the flight (alpha) range. Vic Quote Link to comment Share on other sites More sharing options...
Juan Posted December 28, 2017 Author Share Posted December 28, 2017 On 12/9/2017 at 5:14 PM, pjvr99 said: What aircraft model? PJVR99, it is a KC model, upgraded with EPCS The problem was that none of the four propellers went to reverse and the FCU was still sending fuel, so below ground idle, the engines were still giving positive torque. The beta lights went on, and also the no reverse lights, but apparently these illuminated after the throttle levers were in GI Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted December 28, 2017 Share Posted December 28, 2017 WOW! System wide failure .... did you get it figured out? We've had a lot of wierd stuff with our EPCS birds, but this one is a first. Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted December 28, 2017 Share Posted December 28, 2017 A system failure on all 4 props at once....you're talking probability numbers to the 20th or 30th decimal! I would discount that possibility...or, go get a lottery ticket! What was the aircraft speed when beta was selected?? And, what do you refer to by: On 12/8/2017 at 1:32 PM, Juan said: - 4 engines to Flight Idle, 1000/1200 PSI each. Quote Link to comment Share on other sites More sharing options...
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