performance. With the exception of fluid cans or
drums installed in approved dispensing units, open
cans of hydraulic fluid are prohibited. Containers for
disposal of used fluid must be prominently marked
and identified. Empty fluid containers must be
destroyed or returned to supply as appropriate.
Do not reuse hydraulic fluid drained from
hydraulic equipment or components. Dispose of
drained fluid immediately so it won’t be accidentally
reused. In the event hydraulic fluid is spilled on other
parts of equipment on the aircraft, remove spilled
fluid using approved wiping materials and
dry-cleaning solvent P-D-680.
SPECIFIC SUPPORT EQUIPMENT
Several approved types of fluid-dispensing
equipment are available for use in servicing hydraulic
systems. The primary difference between the types of
equipment is their fluid-holding capacity. As you read
this section, refer to table 4-4, which lists the different
types of fluid-dispensing equipment. Do not use any
fluid servicing equipment other than that listed in the
table; they are not authorized unless specifically
approved for use by the aircraft controlling custodian,
cognizant engineering activity, NADEPs, or NAV-
AIRSYSCOM. All SE must be fitted with 3-micron
(absolute) filtration in the fluid discharge line. SE
construction must not expose fluid contents to
internally generated or external contamination.
Model H-250-1 Hydraulic Servicing Unit
either
The Model H-250-1 hydraulic servicing unit is a
1-gallon servicing unit (fig. 4-8). It provides a way of
servicing systems by hand-pumping filtered fluid
directly from the original container without exposing
the fluid to open air or to other atmospheric
contamination.
The unit accepts the standard,
l-gallon container, which, when installed, serves as a
reservoir. The servicing unit has 3-micron (absolute)
filtration to prevent particulate contamination of a
system by new fluid that may not meet the prescribed
cleanliness prior to packaging. While contamination
in new fluid is rare, its occurrence has been reported.
Figure 4-8.—Insertion of can into Hydraulic Servicing Unit H-250-1.
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