SERVICE ROTARY-WING HUB OIL TANK (Continued)
Under normal conditions rotary heads
shall be serviced with only one type
of oil ( E254 or E254.1). Oil (E254)
must be used for temperatures below
-25 F (-32 C).
Rotary-wing hub oil tanks on aft and
forward rotors are serviced the same
Rotor blades must be positioned as
shown to get a correct reading of hub
Using tiedown line (1), turn rotor blades (2) so
one blade is positioned at a 90 angle to left or
right side of helicopter.
Prolonged oil leakage can damage
finish and create a work hazard
by making the fuselage slippery. It
can also affect other systems in the
helicopter. Therefore, good judgment
must be used when determining
If oil level in sight gage drops from full
(half-way) mark to bottom of glass in
two hours of operation, leakage is too
great. Check for source of leakage.
Repair as required.
Check oil level in sight gage (3) next to the blade
that is positioned at 90 angle. If oil level is half
full or more, servicing is not required. If oil level
is less than half full, go to step 3.
There are three filler plugs for the hub
Remove lockwire from highest filler plug (4).