TM 1-1740-204-13&P
G3, is 3800 psi. Reduce the pump drive by turning low pressure regulator, R1, T-handle counter clockwise
if the safety relief valve, SV2, starts to exhaust.
(5)
Adjust the high pressure regulator, R2, until the required servicing pressure as shown on gauge, G4, is
attained.
(6)
Open high pressure shut-off valve, V3. Connect the inflating chuck of the charging hose assembly to the
inlet port of the vessel to be serviced. Do not over torque the inflating chuck, C6.
(7)
Refer to applicable aircraft manuals for charging procedures. Open the shut off valve, V4, in the high
pressure servicing hose.
(8)
Depressurize and shut down the system per paragraph 2-7. Leave the shutoff valve, V4, in the high
pressure charging hose open to vent the line.
(9)
Remove the inflating chuck, C6, from the inlet port of the aircraft component.
b.
High pressure servicing using shop air to drive the booster pump:
(1)
Setup the cart per paragraph 2-5. Use one or two tanks with adequate pressure to complete the charging
procedure for the given accumulator or strut.
(2)
Connect shop air or a portable air compressor to the shop air inlet, C3. (Make sure that the shop air is
connected upstream from any air line lubricator.) Verify that the low pressure regulator, R1, has its T-
handle turned fully counter clockwise since nitrogen will not be used to drive the booster pump, P.
(3)
Slowly open valve(s) located on the nitrogen tank(s).
(4)
Read tank pressure on regulator, G1. Replace tank if pressure is below 350 psi or if it will be reduced to
350 psi during the charging operation.
(5)
Open the booster shutoff valve, V1. Raise the booster pump drive pressure by slowly adjusting the shop
air regulator, R3, until the indicated pressure on the pump outlet pressure gauge, G3, is 3800 psi. Reduce
if SV2 starts to exhaust.
NOTE
The shop air supply may be inadequate to charge the pump outlet pressure to 3800 psi. If it is
insufficient to boost the output pressure to complete the task, use the booster pump procedure
in paragraph 2-11.a.
(6)
Adjust the high pressure regulator, R2, until the required servicing pressure as shown on gauge, G4, is
attained.
(7)
Open high pressure shut-off valve, V3. Connect the inflating chuck of the charging hose assembly to the
inlet port of the vessel to be serviced. Do not over torque the inflating chuck.
(8)
Refer to applicable aircraft manuals for charging procedures. Open the shut off valve, V4, in the high
pressure servicing hose.
(9)
Depressurize and shut down the system per paragraph 2-7.
(10)
Disconnect the inflating chuck, C6, from the inlet port of the aircraft component.
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