TM 55-1520-240-T
5-1.1 CENTRIFUGAL DROOP STOP VISUAL CHECK (Continued)
TASK
RESULT
TASK
RESULT
Rotor blades can seriously injure
personnel. Make sure area around
helicopter is clear of personnel
before turning blades.
NOTE
Blade for centrifugal droop stop to be
checked must be positioned over
fuselage.
1. Position blade (1) over fuselage (2). Con-
nect tiedown line (3) to one forward
blade.
2. Have helpers lift blade (1) until fixed droop
stop (4) on pitch shaft (5) is clear of
interposer block (6). Support blade.
Balancing arms must move freely
when blade is raised. Fuselage
can be damaged if there is in-
terference with balancing arm
operation.
3. Move balancing arm (7) outward as far as
There shall be no binding felt when balance arm
it will go.
(7) is moved. Spring (8) shall be clear of other
parts. There shall be no interference with spring
operation. There shall be no interference with
interposer block (6). If there is interference or
binding, refer to TM 55-1520-240-23.
Do not lower rotary wing blade
without warning personnel work-
ing on droop stops. Personnel can
be injured if blade is lowered sud-
denly.
5-1.1
4. Let balancing arm (7) slowly return to
hub (9). Have helpers lower blade (1)
slowly until fixed droop stop (4) rests against
interposer block (6).
5. Repeat steps 1 through 7 on remaining two
aft rotor blades.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Remove tiedown Iine on forward blade.
Close aft pylon work platform.
END OF TASK
5-3
