TM 55-1520-240-23-4
5-9
INSTALL ROTARY-WING HEAD (Continued)
5-9
WARNING
Dry cleaning solvent (E162) is
flammable and toxic. It can irritate
skin and cause burns. Use only in
well-ventilated area, away from heat
and open flame. In case of contact,
immediately flush skin or eyes with
water for at least 15 minutes. Get
medical attention for eyes.
WARNING
Check rotor hub data plate serial
number to ensure that it does not read
UW3018. If rotor hub (S/N UW3018)
is found, do not install. Immediately
contact the technical point of contact
in TB 1-1520-240-20-134.
CAUTION
Horizontal hinge pins with serial
numbers of UW2407 and prior that do
not have a suffix "A" vibro engraved
after the serial number and with total
time since new of 4800 flight hours
or more must be replaced.
NOTE
Procedure is similar to install
rotary-wing head with or without
blades attached. Installation of
rotary-wing head with blades removed
is shown.
Task is similar for forward and aft
rotary-wing heads. Differences are
noted in text. Forward rotary-wing
head can be installed with forward
transmission package in workstand.
1.
Remove barrier material from driveshaft (1).
Clean splines (2). Use cloth (E120) damp with
dry cleaning solvent (E162). Wear gloves (E186).
Wipe splines dry. Use clean cloth (E120). Apply
thick coat of grease (E190) evenly to splines.
Use brush (E86).
1.1.
Check weight cavity drain hole in pitch-varying
housing to ensure it is clear of debris. Use pipe
cleaner (E469).
2.
Check that spacer (3) is installed on shaft (1) of
forward transmission.
3.
Check that centrifugal droop stop (4) is installed
on shaft (1) of aft vertical shaft.
5-56
Change 2
