Leerjet 35/36 Developed for Training Purposes 4G-3
October 2001
Hydraulic System
Hydraulic System
Hydraulic fluid is supplied from a reservoir through supply lines
and shutoff valves to the engine-driven pumps and an auxiliary
pump.
The engine-driven hydraulic pumps provide fluid under pres-
sure through lines, check valves and a filter to the hydraulically
operated systems upon demand.
Systems using hydraulic pressure include:
Q
landing gear
Q
spoilers (engine-driven only)
Q
flaps
Q
brakes
Q
thrust reversers (Dee Howard TR4000, if installed).
Normal Operation
With the engines running, each engine-driven hydraulic pump
draws fluid from the pressurized reservoir through an electri-
cally operated firewall shutoff valve. Pulling the associated
FIRE PULL or ENG FIRE PULL handle electrically closes the
shutoff valve.
Regulated bleed air pressurizes the reservoir to approximately
17 PSI to ensure positive fluid flow to the pumps and prevent
pump cavitation. If reservoir pressure exceeds 20 PSI, a relief
valve opens to vent excess pressure. If negative pressure over
0.5 PSI exists in the reservoir, a vacuum relief valve opens to
vent the reservoir to atmosphere.
Each variable-volume constant-pressure engine-driven hydrau-
lic pump supplies fluid at a regulated pressure of 1,450 to 1,550
PSI to the systems through check valves and filters.
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