TM 55-1520-240-23-4
5-9
INSTALL ROTARY-WING HEAD
(Continued)
5-9
35.
On aft hub oil tank (21) only, connect each of
three droop stop springs (41) and limiter springs
(42) as follows:
a.
Remove nut (43), washers (44 and 45) and
bolt (46).
b.
Check that spring (41), limiter spring (42),
special washers (47), and bearing (48) are
assembled as shown.
c.
Install assembly (49) between lugs (50).
d.
Install bolt (46), nut (43), and cotter pin (51).
Install washers (44 and 45), if required, to
align cotter pin.
36.
Check that there is no gap between flange of
bushing (52) and lower surface of lower lug (53).
Have qualified inspector verify that
bushings (52) are installed. Damage
to rotor head/pitch-varying housing
will result bushings are left out of
lower lugs.
INSTALL HEAD WITHOUT 50
37.
Install one sliding bushing (54) in each of the
three lower lugs (53).
INSTALL HEAD WITH 50
38.
Do not install bushings (54 and 54.1) in each of
the three lower lugs (53). Bushings are part of
rotor head.
INSPECT
FOLLOW-ON MAINTENANCE:
Attach pitch links to pitch housings (Task 5-99).
Remove pitch lockpins (T22) if blades were attached
(Task 5-96.2).
Check vertical pin angles (Task 11-55).
Install rotary-wing blades if blades were not attached
(Task 5-84).
Install droop stop shrouds on aft head, if required
(Task 5-48.5).
Inspect centrifugal droop stop springs and balancing
arms (Task 5-50).
END OF TASK
5-67
