53-51 Vertical Stabilizer (continued)
B. Upper Vertical Stabilizer Installation
1. Refer to Figure 53-6. Position C042-1 stabilizer on empennage. Verify 0.030-0.120
inch gap between C042-1 stabilizer skin edges and upper horizontal stabilizer skins.
File vertical stabilizer skin edge(s) as required.
2. Install four bolts (threaded) and spacers securing C042-1 stabilizer to upper horizontal
stabilizer. Special torque bolts per Section 20-33, and torque stripe per Figure 5-1.
3. Install fastener securing C554 clips to upper horizontal stabilizer trailing edge. (If
reusing C554-1 clip, install clip and fastener, and match drill clip to vertical stabilizer
with #30 drill. Deburr holes and install rivets.) Torque stripe fastener per Figure
5-1.
C. Lower Vertical Stabilizer Removal
1. Remove tail rotor guard assembly per Section 53-53.
2. Remove aux stabilizer assembly per Section 53-52, and tail skid per Section 53-54,
as required.
3. Refer to Figure 53-6. Remove fastener securing C554 clips to upper horizontal
stabilizer trailing edge.
4. Support C043-1 lower vertical stabilizer. Remove four bolts (threaded) and spacers
securing C043-1 stabilizer to upper horizontal stabilizer, and remove C043-1
stabilizer.
5. If replacing stabilizer, C554-2 clip may be reused. Drill out two rivets securing clip
to stabilizer.
D. Lower Vertical Stabilizer Installation
1. Refer to Figure 53-6. Position C043-1 stabilizer on empennage. Verify 0.030-0.120
inch gap between C043-1 stabilizer skin edges and upper horizontal stabilizer skins.
File vertical stabilizer skin edge(s) as required.
2. Install four bolts (threaded) and spacers securing C043-1 stabilizer to upper horizontal
stabilizer. Special torque bolts per Section 20-33, and torque stripe per Figure 5-1.
3. Install fastener securing C554 clips to upper horizontal stabilizer trailing edge. (If
reusing C554-2 clip, install clip and fastener, and match drill clip to vertical stabilizer
with #30 drill. Deburr holes and install rivets.) Torque stripe fastener per Figure
5-1.
4. Install aux stabilizer assembly per Section 53-52, and tail skid per Section 53-54, as
required.
5. Install tail rotor guard assembly per Section 53-53.
Page 53.18 Chapter 53 Fuselage R66 Maintenance Manual 25 OCT 2010
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