TB 1-1520-238-20-135
10.1.1 Cure per the following:
10.1.1.1 30 minutes at room temperature.
10.1.1.2 Then 30 minutes at 140 --160 degrees F.
10.1.1.3 Cool at ambient temperature.
10.2 Safe aircraft per paragraph 7.
10.3 On each of the 4 main rotor pitch change housings locate the eight 7-211411188 clips referencing (6)
10.4 Disassemble the bonding jumper and discard attaching hardware referencing (Fig. 1).
10.5 Remove Damper Rod End/Lead Lag Link hardware. Retain the clips, P/N 7-211411188, washers, P/N
MS9549-17 (located between the Damper Rod End and the Lead Lag Link) and bushing, sleeve, P/N
7-211411198-7 for reinstallation while discarding all remaining hardware.
10.6 Coat shank and head of bolts with corrosion preventative compound. Install bolts, NAS1305-3, clips,
7-211411188, washers NAS1149F1232P, bushings 7-311411198-7, washers MS9549-17, and nuts,
HS262-1216 referencing (Fig. 4) Ensure the clips are installed 180 degrees from the original installation.
Torque nut HS262-1216 to 650-700 inch-pounds.
10.7 Attach bond jumper P/N HS5509-18E-3 along with the existing bond jumper P/N MS25083-2DD7
using, bolts, NAS1306-2, washers NAS1149D0663J, and nuts MS21042L6 referencing (Fig. 3). Torque nuts,
MS21042L6, to 60-85 inch-pounds.
10.8 On each of the 4 main rotor blades locate bond jumper P/N HS5509-11-DE-3 and attaching hardware
referencing bolt (11), washer (15), lead (5), washer (14 and 13) and nut (12) (Fig. 1).
10.9 Remove and discard bond jumper P/N HS5509-11-DE-3 and attaching hardware referencing bolt (11),
washer (15), lead (5), washer (14 and 13) and nut (12) (Fig. 1).
NOTE
Ensure that the concave side of the bushings anchors face the bolt head
and the nut/washer stack up.
10.10 Install bolts, MS21250-06050, upper bushing anchors, 7-311412116-1, clips, P/N 7-311412119-1,
lower bushing anchors, 7-311412117-1, washers, NAS1149C0663R, and nuts, HS262-624 referencing (Fig.
NOTE
lead lag link/damper clip is installed to the lagging clip on the blade root and
that the lagging jumper is installed on the leading clip on the blade root.
NOTE
The bolt (MS21250-06050), upper anchor bushing (7-311412116-1), clip
(7-311412119-1), blade route bushing (7-311412114-5), lower anchor bush-
ing (7-311412117-1, washers (NAS1149C0663R) and nut (HS262-624) as
referenced in Figures 3 and 5 as an assembly, may rotate in blade after the
assembly is torqued. This rotation is acceptable and the assembly is per
engineering design.
10.11 Install bolts, NAS1306-2, washers, NAS1149D0663J, nuts, MS21042L6, bonding jumper,
HS5509-18-DE-3, to clips 7-311312119-1 referncing (Fig. 3). Torque nuts, MS21042L6 to 90-110 inch-
pounds.
10.12 Route bond jumper P/N HS5509-18-DE-3 referencing (Fig. 2). Attach other end of the bond jumpers
P/N HS5509-18-DE-3 to the clips P/N 7-311412119-1 using kitted hardware, (Fig. 3).
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