and flushing of the hydraulic systems. For the
functional test of the hydraulic system, a stand
capable of supplying a fluid pressure and flow rate at
least equal to that employed in the system must be
used. The stand must have a fluid reserve adequate
to allow replenishing and draining of the various
circuits and permit extended functional tests to be
carried out without overheating the hydraulic fluid and
system components.
the maintenance of the hydraulic circuit of the stand is
of the same importance as that of the circuits in the
aircraft. The hydraulic stand and connecting pipes
must always be kept clean. The filter elements of the
stand must be removed periodically, inspected and
replaced. Between a periodic removal and a
replacement it is necessary to frequently check the
pressure drop across every filter element. If the
pressure drop exceeds the prescribed limit or an
inspection reveals foreign matter in the element of a
filter, the reservoir of the stand must be drained and
the hydraulic system of the stand drained and flushed
with clean fluid.
the hydraulic stand:
provided with an adequate reservoir).