TECHNICAL DESCRIPTION, OPERATING, MAINTENANCE AND REPAIR MANUAL
1.6.6.4 Retractable undercarriage system
Fig.5 The hydraulic system scheme of the retractable undercarriage
CAUTION
In case that the Hydraulic pump indication light (17) is shining for more than 20 seconds switch off
the Hydraulic pump circuit breaker (15). The continues running of hydraulic pump will causes
damage of hydraulic system. This can be caused of loose of hydraulic pressure because of hose
leaking or other resson. Fly with extended undercarriage and after landing contact authorised
technican to find and solve the problem.
The power is supplied from the battery to the overswitch S1 in the up position on the
instrument panel labelled “Hydraulic On”, which switch on the hydraulic pump by
means of the pressure switch and the relay. The pressure switch switches off the power
after reaching of desired pressure. The overswitch S1 in the down position labelled
“Emergency extension of L/G” switches on the emergency extension of the
undercarriage. The emergency extension of the undercarriage is carried out by own
mass with the help a three-way valve. The drag stay is arrested with help of the
springs. The other overswitch S2 controls the direction of the pressure fluid movement
for extension or retraction of the undercarriage. The pressure fluid proceeds via the
three-way valve to the one or another side of the hydraulic face ram. Both sides of the
hydraulic face ram are without pressure at the emergency extension of the
undercarriage.
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