TM 55-4920-394-13&P
c.
Start fill pump.
d.
Fill the aircraft reservoir by opening the system fill valve (8). Leave the system fill valve opened
until the filling operation is complete.
NOTE
The fill system output pressure can be monitored by observing the BOOST
PUMP PRESSURE gage (3).
e.
Bleed the air from the system by pressing the FILTER BLEED VALVE (6). Observe the FILTER
BLEED valve sight tube and hold the FILTER BLEED valve depressed until clear fluid flows
through the sight tube with no air bubbles.
f.
After the bleeding operation is complete, check the aircraft fluid level. Refill the aircraft reservoir as
necessary by opening the system fill valve.
2-13. Aircraft Filling Procedure. If the aircraft system has been drained, fill and air bleed the aircraft system
as follows:
NOTE
Two people are needed for this operation; one to operate the test stand
and one in the aircraft to observe the filling operation.
a.
Perform all procedures described in paragraphs 2-2 through 2-5.
b.
Open flow control valve (22).
c.
Slowly close fluid bypass valve (24).
d.
With fill system operating, press filter bleed valve (5) while continually cycling the aircraft controls
until all air is bled from the aircraft system.
NOTE
When the pressure indicated by the BOOST PUMP PRESSURE gage (3)
drops below 45 psig, release the filter bleed valve and allow pressure to
build up to at least 50 psig before again pressing the FILTER BLEED
valve.
e.
Slowly close the FLUID BYPASS valve (24).
f.
Slowly increase the volume output of the test stand system and repeat the air bleed operation at
one-quarter turn increments of the pump volume control until the rated flow of the aircraft system
has been reached.
2-10
