TM 1-1520-238-23
5-50
Change 5
5.8.
MAIN ROTOR BLADE PHASE ADJUSTMENT – continued
5.8.4. Phase Adjustment
NOTE
Temperature affects damper perfor-
mance. Best results may be obtained
when phasing is accomplished above
50 degrees F. If phasing cannot be ac-
complished above 50 degrees F, phas-
ing should be checked after first flight.
Fine blade adjustment is accom-
plished by adjusting the forward or aft
damper rod end only one half turn at a
time. Do not adjust either damper
more than one half turn without adjust-
ing the other damper one half turn.
Manually oscillate the blade fore and
aft, prior to and after each adjustment.
a. Disconnect aft damper (21).
(1) Remove lockwire (22).
(2) Insert rod end centering fork (23) to prevent
damage to key washer (24). Use rod end cen-
tering fork (figure D-444, App D).
(3) Loosen jam nut (25).
(4) Remove fork (23).
(5) Disconnect damper rod end (26) from lead
lag link (27).
(a) Hold bolt (28). Use box wrench.
(b) Remove nut (29) and washer (30). Use
ratchet.
(c) Remove bolt (28), angle bracket (31),
sleeve bushing (32), and washer (33).
b. Check phase. If blade moves into phase, ad-
just aft damper rod end so the bolt drops in
unassisted (within 1/2 turn lagging) and go to
subsequent step c.(4).
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M04-3042-17
21
22
25
24
M04-3042-20
23
M04-3042-21
28
31
32
26
27
30
29
33
