Open access door and remove pneumatic
hose from storage compartment. Route hose out of
compartment so access door can be closed, and hose
is routed under rubber flap at bottom of door.
Pneumatic hose and adapter fitting become ex-
tremely hot when pneumatic power is applied.
Straighten out hose to remove any kinks.
Never touch hose or adapter fitting until pneu-
matic power is removed and hose and adapter
Connect pneumatic hose fitting to aircraft.
have cooled. Wear proper gloves.
Pneumatic Power Application.
Handle hose with care so spiral wrap and net-
ting are not damaged.
Never set PNEUMATIC POWER switch to
ON unless pneumatic hose fitting is securely
Disconnect pneumatic hose fitting from
attached to aircraft. The hose will attempt to
straighten out with power applied, and whip
around violently if not securely attached to air-
Open access door and carefully store
craft. Wear proper gloves and eye protection
hose in compartment.
(goggles or face shield) when operating pneu-
Close access door.
HYDRAULIC SYSTEM OPERATION.
The air output is reduced when the surge con-
trol valve is open. Do not attempt to cool the
Flushing/Purging of Hydraulic System.
AH-64A or ground air start any aircraft when the
CURRENT LIMIT SELECTOR switch is in the
Set PNEUMATIC POWER switch (1, Fig.
Ensure all hydraulic hose connectors on the
to ON (check that green indicator light illuminates).
AGPU control panel, the dual service manifolds,
Observe that PSIG PNEUMATIC gauge
with a cap or plug. When making connections,
(2) indicates in green range.
reconnect the removed plug to protect against
following hose connections and flushing/purg-
Pneumatic pressure may modulate engine EGT
ing operation requires the dual manifold to be
becomes too high (load control valve will auto-
modified for runaround use. This modification
automatically reduce pneumatic output until en-
is directed by MWO 1-1730-229-50-3.
gine EGT is lowered to acceptable level).
Remove the appropriate hydraulic
Remove pneumatic power from aircraft by
hoses and the appropriate adapter hose listed in Table
performing steps (4) through (7).
2-6 from storage rack behind engine access door.
Set PNEUMATIC POWER switch (1) to
Layout entire lengths of
Straighten hoses to eliminate loops and kinks.