lever to off and make sure reservoir
lever is set to AGPU.
Dual service manifold is
(12) Set hydraulic power switch
used on both single and dual
dual hydraulic systems.
and aircraft system pressure in
(2) Flush hoses and connect AGPU
to aircraft GSE connectors in accor-
(13) Set the AGPU hydraulic
output switch to on.
(3) Locate a clean 10-gallon or
AGPU fluid level will de-
(4) Connect a hose to drain
crease to between 1/2 and
connector on the AGPU dual service
1/3 full on the reservoir
manifold drain port and place opposite
level gauge. Do not allow
end of hose in drum. (Any AGPU adap-
the reservoir level to de-
ter hose can be used as the drain
crease below 1/3 full. (5-
hose by removing the quick disconnect
7 gallons flushed)
(5) Ensure bypass/flush and fill/
Do not let the reservoir
go empty. Extensive da-
mage to the AGPU hydraulic
Personnel are required to
use the aircraft intercom
communication system to
fluid level cycle flight controls
(cyclic, collective, and pedals) 5
flight controls and the
Shut off AGPU dual mani-
fold drain port.
(6) Apply external power to the
(16) Cycle flight controls two
aircraft and establish voice communi-
communication via intercom communi-
Flush is complete.
(7) Apply external air to aircraft
output to off.
pressure to 500 psi. Switch hydraulic
(8) Recheck the AGPU reservoir
power to off.
fill level gauge on the hydraulic
control panel to ensure the reservoir
While monitoring utility
is full. Add fluid if necessary.
manifold reservoir level, move the
return bypass to bypass until the
(9) Open AGPU dual hydraulic
proper reservoir level is reached then
switch back to the off position.
(20) Shut down AGPU. Discon-
(10) Discharge aircraft hydraulic
nect and store hoses and mani-
(11) On the AGPU hydraulic con-
trol panel set return/bypass