4G-4 Developed for Training Purposes Leerjet 35/36
October 2001
CAE SimuFlite
An accumulator, pressurized to 850 PSI with nitrogen, damp-
ens pressure surges developed during system operation.
A pressure relief valve opens to bypass fluid from the pressure
line to the return line if the system exceeds 1,700 PSI.
After supplying the various systems, hydraulic fluid returns
through check valves and a filter to the reservoir.
Auxiliary Hydraulic Pump
The auxiliary hydraulic pump can be used for ground operation
of the parking brake and flaps. In flight, if the normal hydraulic
system fails, the auxiliary pump may be used for emergency
operation of the flaps or brakes (with anti-skid) upon landing.
The auxiliary pump does not operate the spoilers.
All of the fluid in the reservoir is available to the auxiliary
hydraulic pump. The bottom 0.4 gallons is not available to the
engine-driven pumps.
Placing the HYD PUMP switch to the ON position energizes the
electric hydraulic pump. The pump, controlled by a pressure
switch, cycles on at 1,125 PSI and off at 1,250 PSI. On aircraft
35-647 and subsequent, and 36-059 and subsequent, the
pump cycles on at 1,000 PSI and off at 1,125 PSI.
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