TM 55-1730-229-12
TO 35C2-3-473-1
To prevent damage to the AGPU
(5) Ensure bypass/flush
and
AGPU hydraulic pump, the
fill/drain valves are closed.
RESERVOIR selector must always
be set to AGPU on completion of
NOTE
servicing
with
AIRCRAFT
reservoir (CH-47D).
Personnel are required to
use the aircraft intercom
(1)
Check the aircraft reservoir
communication system to
levels.
maintain voice communi-
cations between the person
(2) If overfilled move RETURN
operating
the
flight
BYPASS selector to BYPASS to drain. If
controls
and
the
AGPU
the level is low move the selector to
operator.
OFF.
(3) When proper reservoir levels
(6) Apply external power to
are restored simultaneously switch both
the aircraft and establish voice
the RETURN BYPASS and OUTPUT to OFF.
communication
via
intercom
communication system.
(4) Open HIGH PRESSURE BLEED valve
1/4 turn. Hold PRESSURE switch (11) to
(7) Apply external
air
to
DECREASE position until the OUTPUT
aircraft (AH-64 only).
PRESSURE drops to 500 to 700 psig.
(8) Recheck the AGPU reser-
(5) Close HIGH PRESSURE BLEED
voir fill level gauge on the
valve.
hydraulic control panel to ensure
(6) Disconnect hoses, reinstall
the reservoir is full. Add fluid
all caps and plugs in stow in AGPU.
if necessary.
h. Flush Aircraft Flight Control
(9) Open AGPU dual hydraulic
System.
service manifold drain valve and
drain
aircraft
reservoir.
NOTE
(10) Discharge
aircraft
hy-
Dual service manifold is
draulic accumulators.
used on both single and
dual hydraulic systems.
(11) On the AGPU hydraulic
control panel set RETURN BYPASS
(1)
The AGPU must have been
selector to OFF and make sure
properly sampled and cleared for
RESERVOIR
selector
is
set
to
operation.
Ensure the reservoir is
AGPU.
full.
(2)
Flush hoses and connect AGPU
(12)
Set
hydraulic
POWER
to
aircraft
GSE
connectors
in
switch to ON.
Set OUTPUT switch
accordance
with
to
ON.
Set
aircraft
system
through e, above.
pressure in accordance with Table
2-7.
(3)
Locate a clean 10-gallon or
larger drum.
NOTE
(4)
Connect a hose to drain
AGPU
fluid
level
will
connector on the AGPU dual service
decrease to between 1/2 and
manifold
drain
port
and
place
1/3 full on the reservoir
opposite end of hose in drum.
(Any
level gauge. Do not allow
AGPU adapter hose can be used as the
the reservoir level to
drain hose by removing the quick
decrease below 1/3 full.
disconnect couplings at both ends.)
(5-7 gallons flushed)
