53-33 Upper Frame (continued)
B. Installation
1. Position F020-1 upper frame inside helicopter. Install mounting hardware securing
upper frame to firewalls, cabin bulkhead, and fuel bladder support assembly.
Standard torque bolts per § 20-32, and torque stripe per Figure 5-1. Seal around
frame weldment edges at firewalls, bulkhead, and support using B270-1 sealant.
2. Install fasteners securing upper frame to horizontal firewall. Standard torque
hardware per § 20-32, and torque stripe per Figure 5-1.
3. Install hardware securing A331-4 bellcrank assembly to upper frame. Standard
torque bolt per § 20-32, and torque stripe per Figure 5-1. Slide C494-2 shaft
outboard thru F316-1 bellcrank assembly and upper frame and install spacer, nut,
and palnut. Special torque nut per § 20-33, and torque stripe per Figure 5-1.
4. Install ELT transmitter per § 25-61, if installed. Install clamps and hardware
securing clamps to upper frame.
5. Install B157-1 (pulley) mount and hardware securing mount to frame. Install
hardware securing rotor brake cable assembly to frame.
6. Install F231-8 braces and hardware securing braces to fuel bladder support, and to
frame.
7. Install hardware securing F651-1 oil filter assembly to frame. Standard torque
hardware per § 20-32, and torque stripe per Figure 5-1. Remove caps and plugs and
connect D205-19 hose assembly and F724-1 line assembly to F823-1 thermostat
assembly. Standard torque hose assembly nuts per § 20-32, special torque line
assembly nuts per § 20-33, & torque stripe per Figure 5-1.
8. Install MS3367-4-9 or -5-9 ty-raps as required to secure wire harness & cables
to frame. Cinch ty-raps until snug without over-tightening, & trim tips flush with
heads.
9. Install main rotor gearbox per § 63-20, but do not install F252-1 strut until step 13.
10. Install engine per § 71-10.
11. Install engine shaft weldment per § 63-10.
12. Install air filter and cage assembly per § 71-22. Install hardware securing G258-
4 strap to fuel bladder support and connect air bypass switch assembly wiring at
connector.
13. Install hardware securing F252-1 strut to F020-1 upper frame. Standard torque
bolts per § 20-32, and torque stripe per Figure 5-1.
14. Install F306-1 box assembly and hardware securing box to firewall. Install F236-1
scroll assembly and hardware securing scroll to box.
15. Install tail rotor drive shaft weldment per § 65-10.
16. Install tailcone assembly per § 53-40.
MAY 2015 Chapter 53 Fuselage Page 53.11
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