53-33 Upper Frame
Refer to R66 Illustrated Parts Catalog (IPC) Figure 53-11 and 53-11B.
A. Removal
1. Remove main rotor blades per Section 62-10.
2. Remove tailcone assembly per Section 53-40.
3. Remove tail rotor drive shaft weldment per Section 65-10.
4. Remove hardware securing F236-1 scroll assembly to F306-1 box assembly. Remove
hardware securing box to firewall.
5. Remove hardware securing F252-1 strut to F020-1 upper frame and remove strut.
6. Remove air filter and cage assembly per Section 71-22. Disconnect air bypass
switch assembly wiring at connector and remove hardware securing G258-4 strap
to fuel bladder support assembly.
7. Remove engine shaft weldment per Section 63-10.
8. Remove engine per Section 71-10.
9. Remove main rotor gearbox per Section 63-20, steps 2 thru 12.
10. Cut and discard ty-raps securing wires and antenna cables to frame, as required.
11. Disconnect D205-19 hose assembly and F724-1 line assembly from F823-1 thermostat
assembly. Plug hose and line and cap fittings. Remove hardware securing F651-1
oil filter assembly to frame.
12. Remove hardware securing F231-8 braces to fuel bladder support, and to frame.
13. Remove hardware securing rotor brake cable assembly to frame. Remove hardware
securing B157-1 (pulley) mount to frame.
14. Remove ELT transmitter per Section 25-61, if installed. Remove hardware securing
clamps to upper frame and remove clamps.
15. Remove palnut, nut, and spacer securing F316-1 bellcrank assembly to upper frame,
and slide C494-2 shaft inboard until it clears frame. Remove fastener securing
A331-4 bellcrank assembly to upper frame and swing bellcrank clear of frame.
16. Remove fasteners securing upper frame to horizontal firewall.
17. Using plastic scraper, remove sealant around frame weldment edges at firewalls,
cabin bulkhead, and fuel bladder support.
18. Remove mounting hardware securing upper frame to firewalls, bulkhead, and support
and remove frame.
Page 53.10 Chapter 53 Fuselage R66 Maintenance Manual 25 OCT 2010
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