Willmus11
commented
2 months ago As for start up EDP test works as follow: L pump OFF when fuel is switched ON and R pump turns ON for 1min (amber OFF is displayed on L pump on HYD panel) After 1 min the L pump turns ON again and R pump turns OFF and an amber OFF light will illuminate on R pump for 5sec before disapearing
Describe the bug
EDP are not commanded ON or OFF during certain phase of flight
Steps to reproduce
Turn off left EDP (L PUMP) on HYD panel, system loose pressure
Expected behaviour
Right EDP should automatically turn ON when the left one is commanded off (auto or manual mode), if left EDP turns back ON the right will revert to standby mode (left pump is a primary pump while right is a backup)
EDP are also commaded off when:
-EDP pressure low -EDP temperature high -Fluid QTY LOW (less than 2.5USG) -System pressure is low or high (less than 2400PSI or more than 3500PSI) -System temperature is high (more than 100 degrees C) -The engine is being started -Fire handle is pulled
Moreover The HSC reverts to manual if:
Dual hydraulic failure occurs and at the same time an EDP fails in the remaining system. • More than four EDPs are required to be commanded off because of detected failures
Evidence
FCOM vol III
Simulator
Microsoft Flight Simulator 2020 (MSFS)
Crash
No
Phase of flight
Cruise
Altitude
0-18000
Agreement