TM 55-1615-226-40
(8) Score marks on the inside surface of
holes and bushings must not exceed 0.002 inch.
2-19. Hub And Collective Sleeve.
2-20. Inspect hub and collective sleeve as follows:
a. Perform nondestructive inspection of hub in
accordance with table 2-1.
b. Inspect hub bolt hole ID for wear. Wear limit
shall not exceed 0.5015 inch.
c. Inspect hub-bearing bore ID for wear. Wear
limit shall not exceed 5.2520 inches.
d. Inspect hub for mechanical or corrosion
damage.
(1) Mechanical or corrosion damage to
thread inside hub.
(2) Mechanical damage shall not exceed
0.010 inch in depth on the flat surfaces at the end of
scissors attachment lugs and the surrounding
surfaces within 0.60 inch of these ends
(3) Mechanical damage shall not exceed
0.010 inch in depth on the 0.4995-inch bore surface
(4) Corrosion damage shall not exceed
0.005 inch in depth on the flat surfaces at the end of
the scissors attachment lugs on the surrounding
surfaces within 0.60 inch of these ends
(5) Corrosion damage shall not exceed
0.005 inch in depth on the 0.4995-inch bore surface.
(6) Mechanical damage shall not exceed
0.035 inch in depth in all areas of hub other than
specified in (1) (2), and (3) above.
(7) Corrosion damage shall not exceed
0.017 inch in depth.
(8) Damage in any one area shall not
exceed 0.25 square inch in area or 0.75 inch in any one
length.
(9) Mechanical damage to surfaces sur-
rounding a hole, within a distance of 1.5 times the
radius of that hole shall not exceed 0.010 inch in
depth.
(10) Corrosion damage to surfaces sur-
rounding a hole within 1.5 times radius of that hole
shall not exceed 0.005 inch in depth.
(11) Inspect hub bolt hole for scoring. Score
marks inside the bolt hole shall not exceed 0.002 inch.
e. Perform nondestructive inspection of collec-
tive sleeve, in accordance with table 2-1.
f. Inspect sleeve bearing seat for wear. OD of
bearing seat shall not be less than 4.2480 inches
g. Inspect sleeve for damage to the 4-1/4-16
UN-2A threads at upper end of sleeve
h. Inspect sleeve for damage to 10-32 NF3B
threads of the eight bolt holes at the base of the
sleeve
i. Inspect sleeve for mechanical or corrosion
damage.
(1) Mechanical damage shall not exceed
0.01-inch depth to the flat surfaces surrounding the
1.500 inch diameter holes and the inside and outside
of the 4.080-inch OD cylindrical surfaces
(2) Corrosion damage shall not exceed
0.005 inch in depth to the flat surfaces surrounding
the 1.50-inch diameter holes and the inside and
outaide of the 4.080-inch OD cylindrical surfaces
(3) Mechanical damage shall not exceed
0.035 inch in depth in all areas at the sleeve other
than specified in (1) above
(4) Corrosion damage shall not exceed
0.017 inch in depth in all areas of the sleeve other
than specified in (2) above.
j. Visually inspect flange (32, figure 2-1) for
wear or damage.
k. Inspect plate set (33), using nondestructive
teat as outlined in table 2-1. Inspect teeth of splnie for
damage.
l. Visually inspect lock plate (35) for wear or
damage.
m. Inspect nut (36) using nondestructive test
in accordance with table 2-1. Inspect threads for
damage.
n. Visually inspect spacer ring (39) for Wear
or damage, warpage, pitting, scratches corrosion
and cracks.
o. Inspect pin (40) for wear or damage.
p. Inspect nut (41) using nondestructive test in
accordance with table 2-1. Inspect threads for
damage.
q. Inspect bearing set (42) for damaged seals or
shields smoothness and freedom of operation, and
excessive looseness.
NOTE
Check
bearings for
smoothness of operation
prior to disassembly of
sleeve assembly. Visually
inspect bail bearings and
races on bench under
strong light.
2-6
Change 2
