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Appendix C: CONVERTING THE UH-1BI/D/H HELICOPTER HYDRAULIC SYSTEMS FROM MIL-H-S606 TO MIL-H-U83282 HYDRAULIC FLUID
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TB-55-1500-334-25 Conversion of Aircraft to Fire Resistant Hydraulic Fluid Manual
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Appendix D: CONVERTING THE D-5 AND D-6 HYDRAULIC TEST STANDS FROM MIL-H-5606 TO MIL-H-83282 HYDRAULIC FLUID
TB 55-1500-334-25
NOTE
Do not reinstall filter element at this time.
C-6. Filling, Bleeding and Functional Testing.
Refer to Appendix D or E for specific instructions concerning conversion of ground servicing units.
a. Disconnect the return hose to the reservoir at the ground test coupling and allow to drain.
b. Connect the drain line to ground test coupling (return) and place unattached end into a two gallon open
container or a container marked to indicate a two (2) gallon level.
c. Attach pressure hose from hydraulic ground servicing unit to the ground test coupling (pressure) on the
aircraft.
d. Bring hydraulic pressure to 1000 psi and meter hydraulic fluid into the hydraulic system while actuating the
cyclic, collective and anti-torque controls.
NOTE
Use two men, if necessary, to actuate all controls simultaneously.
e. Observe flow of hydraulic fluid from the drain line into the two gallon container until container is full.
f. Relieve pressure at ground test unit, remove pressure line from aircraft and secure hydraulic service unit.
Cap ground test coupling (pressure) on aircraft.
g. Remove drain line from ground test coupling (return) and connect the return line from the reservoir to the
ground test coupling.
h. Install a clean filter element. Torque and safety wire the filter bowl.
i. Fill reservoir to overflow using MIL-H-83282 hydraulic fluid.
i.  Bleed and operational check the hydraulic system I/A/W TM 55-1520-210-23-2, Chapter 7, page 7-9,
paragraph 7-6 a and b.
Change 7
C-2

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