Remove Ice Detector.

TM 55-1520-238-S

q. Remove Sling and Crane. Remove sling

j. Disconnect Mast From Mast Base. Re-

quickrelease pins from main rotor head

move 18 nuts and preload indicating wash-

and hoist sling onto the ground. Uncouple

ers from mast base. Discard preload indi-

crane lifting hook from air vehicle sling link

cating washers.

(lifting eye) and remove crane from the

k. Remove Main Rotor Head and Mast

area.

Unit. Remove right side mixer support

225.10.1 Install Main Transmission Left and Right

bolt and loosen forward mixer support bolt.

Access Panels. Install access panels (L200 and

Use mixer bolt torque adapter (item 51,

R200) and engage 12 camloc fasteners on each panel

table 22) with 3/4 drive, 3inch long exten-

(fig. 24).

sion (item 52, table 22). Slowly raise crane

225.10.2 Remove Ice Detector.

to lift rotor head and mast unit while remov-

TM 1-1520-238-23.

ing forward mixer support bolt. When for-

ward mixer support bolt is removed, lift

a. Wrap ice detector with cushioning material

main rotor head and mast unit out of heli-

(D5) sealed with tape (D13). Secure in

copter.

aft storage bay (R330).

b. Remove two clamps on ice detector warm

l. Secure Main Rotor Drive Shaft

air tube. Deflect tube to fit under sheet met-

Spring. Position drive shaft spring within

al and secure with tape (D13).

shaft hole at top of main transmission.

225.10.3 Remove `Doghouse' Fairing and Radar

m. Install Transmission Shipping Cov-

Jammer Antenna. Release 16 camloc fasteners and

er. Aline main transmission shipping cov-

remove four screws from fairing (T185). Lift fairing, dis-

er (item 59, table 22) over drive shaft

connect antenna plug from receptacle, and remove fair-

spring and main transmission shaft hole.

ing with antenna in place.

Secure cover to top of main transmission.

225.11 Remove Wire Cutters.

Place 18 removed mast base nuts in bag

a. Remove Main Landing Gear Wire Cut-

and attach to mast base.

ters. TM 1-1520-238-23.

n. Preservation. Thoroughly coat all open

b. Remove Upper and Lower Fuselage

bolt holes and reinstalled hardware with

Wire Cutters. (TM 1-1520-238-23).

corrosion preventive compound (D4).

c. Component Wrap. Wrap wire cutters

with cushioning material (D5) sealed with

o. ComponentWrap. Wrap exposed end

tape (D13). Secure wrapped wire cutters

of main rotor drive shaft with barrier materi-

in catwalk area.

al (D1) sealed with tape (D13).

225.12 Remove Steps. Paragraph 211.7.

p. Install Main Rotor Head and Mast Unit in

225.13 Remove Horizontal Stabilator. Paragraph

Shipping Carrier. Aline hoisted main ro-

211.11.

tor head and mast unit over the shipping

225.14 Lock Tail Wheel Landing Gear Strut.

carrier (item 58, table 22). Then carefully

lower the unit into the carrier, guide main

Jack helicopter at FS 450 jacking pad. Use jack (item 50,

rotor drive shaft and mixer support bolts

table 22). Lift tail wheel just clear of ground. Install tail

into mating carrier base supports, and se-

landing gear strut lock (item 60, table 22) over the fully

cure unit to carrier base with four captive

extended tail gear shock strut (fig. 225). Lower and re-

bolts. Install mixer support bolts. Install

move jack.

main rotor head carrier corner straps over

225.15 Stow Vertical Stabilizer.

pitch housing (fig. 224) and secure dis-

a. Remove FMAM Whip Antenna (MWO

connected longitudinal, lateral, and collec-

115202385037 installed) Paragraph

tive mixer clevises to mating carrier turn-

211.14.

buckles, using retained servoactuator rod

end hardware. After securing unit in carrier

b. Remove Vertical Stabilizer Lower Lead-

remove mixer spreader.

ing Edge Fairing. Release 23 camloc

fasteners at fairing (L510) (fig. 226).

c. Remove Tailboom Left Side Aft

NOTE

Step. Remove FS 517/WL 129 left side-

step. Wrap step in cushioning material

Mixer spreader will be used again during

(D5) secured with tape (D13). Stow

removal of second helicopter main rotor

wrapped step in catwalk area.

head and mast unit.

Change 2

255