INSPECTION OF OIL LUBE PORTS, ROTOR HEADS
Aircraft Mechanics Tool Kit, NSN 5180-00-323-4692
Lubricating Oil (E254)
Medium Helicopter Repairer
General Safety Instructions:
Oil (E254) is toxic. It can irritate skin
and cause burns. Avoid inhaling. Use
only with adequate ventilation. Avoid
contact with skin, eyes, or clothing.
In case of contact, immediately flush
skin or eyes for at least 15 minutes.
Get medical attention for eyes.
A complete or partial restrictions of
lubricating oil to the horizontal hinge
pin bearings causes premature wear
and results in damage to the bearings
and related components.
Six oil lube ports are on the upper
surface of the rotor hub. These ports
are located on both the forward and
aft rotor head.
Remove lockwire from drain plug (6) located
below each horizontal hinge bearing on the rotor
Remove lockwire from one of the three filler
plugs (4) located on the top of (main) oil tank
mounted on the top of the rotor head.
Remove filler plugs, one from each tank.
Remove plug (6). Observe oil flow. If oil flow
is present, one oz. minimum, inspection is
complete for that drain.
If oil flow is not observed, probe the drain hole
with a piece of safety wire to free any obstruction.
Reinstall drain plug (6) and torque to 16 to 32
inch-pounds. Lockwire plug (6) to bolt (7). Use