Eurocopter AS 350 83 Flight Manual page 260

COMPLEMENTARY FLIGHT MANUAL
3 SYSTEM CONTROLS AND MONITORING (Figure 1) .
The pilot is informed of hydraulic system fault conditions by a red "HYD"
low-pressure warning light (14) on the Warning-Caution-Advisory Panel which
ignites when the pressure is less than 30 bar (435 psi).
A switch (11) on the collective pitch lever (12) can be used to cut off all
hydraulic power by opening the three solenoid valves on the main rotor
servo-controls to depressurize the systen.
A push-button (13) on the control console is used:
-to test the hydraulic accumulators by opening the regulator unit solenoid
valve (15)
-to depressurize the load compensating servo (9).
.
The hydraulic system filter, located on the regulator unit, is fitted with
a clogging indicator (19).
.
35083 7.8 .
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