a. All Self Locking Bolts (as identified in para 7) will be inspected. The bolt locations are provided in
TM 1-1520-237-23P-4, figures 78/79, or TM 1-1520-250-23P-2, Fig 449.
All self locking bolts, bellcranks, tie-rods, connecting links, control rods, bellcrank sup-
ports, and support fittings are flight safety parts containing critical characteristics which
must not be damaged. Provide protective covering as required.
b. Reposition main rotor so that forward blade is located slightly left of center line.
c. Remove left and right hand engine air inlet IAW para 4-4-4, TM 1-1520-237-23-3, or para 4.4.1, TM
d. Remove main transmission fore and aft fairings IAW para 2-4-116, TM 1-1520-237-23-2, or para
2..37.15, TM 1-1520-250-23-2.
e. Remove forward bolts (70400-08159-101) at fore, aft and lateral control rods and primary servos
IAW para 11-4-91/92 and 93 TM 1-1520-237-23-6, or para 11.23/24 and 25, TM 1-1520-250-23-5.
f. Remove forward attachment bolt (70400-08159-101) of the long control rod at walking beam to
facilitate access to aft bolt on the same control rod.
g. Disconnect main rotor pitch change links at lower rod end bearing IAW para 5-4-17, TM
1-1520-237-23-3, or para 5-10, TM 1-1520-250-23-3. Secure pitch change links away from swashplate.
Damage to swashplate and horn lug areas will result if extreme caution is not used when
disconnecting pitch control rod ends. Use extreme caution.
h. Using a minimum of three cargo straps, (as listed in paragraph 11) suspend straps over the forward
and each lateral main rotor spindle housing and attach lower portion of the strap to swashplate lug that houses
corresponding pitch change link. Carefully operate ratchet mechanism of the straps to raise the swashplate
assembly until even with the top of the swashplate guide.
Damage to swashplate and uniball may result if assembly is raised above the swashplate
i. Remove forward, aft and lateral swashplate connecting link expandable pins IAW para 5-4-21, TM
1-1520-237-23-3, or para 5-11, TM 1-1520-250-23-3. Carefully wrap the links with bubble wrap to prevent
damage to critical areas of the connecting links.