53-30 Frame Assemblies
NOTE
See Section 54-40 for F237-1 tailcone attachment frame
weldment replacement.
WARNING
R66 welded steel tube frames are stress relieved. Field weld
repairs are not allowed; send frames to RHC for repair.
53-31 Lower Frames
Refer to R66 Illustrated Parts Catalog (IPC) Figure 53-7.
A. Removal
1. Remove engine per Section 71-10.
2. Refer to Figure 53-2.
a. F046-1 (LH) only: Remove hardware securing power turbine governor control
cable clamps, F723-3 line assembly clamp, and firewall clamp to F046-1 lower
frame.
b. F046-2 (RH) only: Remove hardware securing battery cable harness clamp,
external power block, and firewall clamp to F046-2 lower frame.
3. Remove hardware securing clamps to firewall securing F049-03 harness assembly,
as required. Cut and discard ty-raps as required, mark wires, and disconnect wires
at plastic connectors to liberate frame.
4. Using plastic scraper, remove sealant around frame weldment(s) at firewalls.
5. Support tailcone (until frames are reinstalled).
a. F046-1 (LH) only: Remove hardware securing frame to F574-5 block (access bolt
thru G246-1 brace, inside baggage compartment). Remove hardware securing
shackle and frame to F574-8 block (threaded).
b. F046-2 (RH) only: Remove hardware securing frame to F574-1 support assembly
(access bolts from inside baggage compartment).
6. Remove hardware securing F174-1 support weldment rod end(s) to F046 lower
frame(s).
7. Remove two bolts and associate hardware securing F020-1 frame weldment, firewall,
and F046 lower frame.
8. Remove hardware securing F046 lower frame to F574-10 block assembly (threaded).
Remove lower frame.
25 OCT 2010 R66 Maintenance Manual Chapter 53 Fuselage Page 53.5
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