TM 1-1520-238-23
Change 8
2-389
2.107.
VERTICAL STABILIZER REMOVAL/INSTALLATION – continued
NOTE
Maintain a 0.020 INCH minimum gap
between the end of bolt threads
(chamfer) and bottom of the barrel nut
hole. A flat washer, P/N AN960-816L,
NSN 5310-00-167 -0839 or flat washer
AN960-816, NSN 5310-00-167-0823
may be added under the existing
washer to obtain minimum gap.
Sequence of bolt installation shall be
left-hand (LH) forward, LH aft, right-
hand (RH) aft and RH forward.
(3) Remove any grease or oil from HS5482-8-20
bolts (21) and HS5483-820 barrel nuts (25).
Use dry cleaning solvent (item 74, App F)
and cloth (item 52, App F). If bolt holes are
not clean of all residue, abrade. Use mat
(item 122, App F).
(4) Apply a coating of lubricant to bolt (21)
threads, shank, and under bolt head, and
washer (22) (Inconel only). Use antiseize
compound (item 26, App F).
NOTE
For aircraft without elastomeric
mounts, perform steps (5) through (7).
For aircraft with elastomeric mounts,
perform steps (8) through (11).
(5) Install four bolts (21) through washers (22)
and lugs (23) in tailboom pads (24). Ensure
recessed side of washer (22) is installed
against bolt (21) head.
(6) Torque four bolts (21) in sequence to break-
away torque plus 50 INCH-POUNDS. Use
torque wrench.
(7) Torque four bolts (21) in sequence and in
increments of 325 INCH-POUNDS up to 975
INCH-POUNDS. Use adapter and applicable
torque wrench.
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25
24
22
23
21
M04-2990-11A
AIRCRAFT WITHOUT ELASTOMERIC
MOUNTS
