53-40 Tailcone Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 53-15.
A. Removal
1. Remove tailcone cowling assembly per § 53-23. Remove engine cowling assembly
per § 53-21.
2. Refer to Figure 53-4. Cut and discard ty-raps as required and disconnect tailcone
wiring at connectors. Disconnect two antenna cables inside tailcone forward bay, and
cables at forward bulkhead, as required.
3. Remove hardware securing D224 tail rotor drive shaft yoke to C947-3 (intermediate)
plate assembly, noting hardware removed.
4. Remove hardware securing C121-17 push-pull tube to A331-4 bellcrank assembly.
5. Remove hardware securing C023 tailcone assembly to frames and remove tailcone.
6. Cut and discard ty-raps as required and remove F237-1 tailcone attachment frame, as
required.
B. Installation
1. Refer to Figure 53-4. Install F237-1 tailcone attachment frame, if not previously
accomplished. Verify correct damper assembly orientation per Figure 65-3.
2. Position C023 tailcone assembly on F020-1 upper frame assembly; do not pinch wiring
between tailcone bulkhead and frames. Install hardware securing tailcone to frames,
standard torque bolts per Section 20-32, and torque stripe per Figure 5-1.
3. Install hardware securing D224 tail rotor drive shaft yoke to C947-3 (intermediate)
plate assembly. Shim tail rotor driveline per § 65-30. Standard torque bolts per § 20-
32, and torque stripe per Figure 5-1.
4. Install hardware securing C121-17 push-pull tube to A331-4 bellcrank assembly.
Standard torque bolt per § 20-32, and torque stripe per Figure 5-1.
5. Perform tail rotor drive shaft runout per § 65-21.
6. Connect tailcone wiring at connectors, connect two antenna cables inside tailcone
forward bay, and connect antenna cables at forward bulkhead, as required. Individually
test and verify correct function of tail position light, strobe, and TR chip light circuits.
7. Install MS3367-4-9 or -5-9 ty-raps as required to secure wire harness and cables
to frame. Cinch ty-raps until snug without over-tightening, and trim tips flush with
heads.
8. Install tailcone cowling assembly per § 53-23. Install engine cowling assembly per §
53-21.
MAY 2015 Chapter 53 Fuselage Page 53.13
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