12-50 Main Rotor Blades
WARNING
Refer to appropriate Material Safety Data Sheet (MSDS) and
take necessary safety precautions when working in proximity to
hazardous materials.
12-51 Pitch Bearing Housing
NOTE
MT147-1 Main rotor blade spindle air bleed tool includes supply
container, hose assemblies, and bleed fittings.
A. Servicing
1. Remove main rotor blades per Section 62-10.
2. Refer to Figure 12-5. Place a suitable drain container below main rotor blade spindle
assembly. Remove two B289-2 bolts and drain fluid.
3. Install MT147-1 bleed tool fittings into ports. Attach drain hose assembly to (top)
bleed fitting, secure with two wraps 0.032-inch diameter lockwire, and safety tight.
Position drain hose into drain container.
4. Place supply container with sufficient A257-4 fluid approximately 3 feet above
spindle. Route fill hose assembly into drain container and open brass valve. Open
supply container plastic valve and purge air from hose. Close valves.
5. Connect brass valve to (bottom) bleed fitting by tightening brass compression
sleeve.
6. Open valves and fill spindle housing until no air bubbles are visible in drain hose
assembly. Massage spindle boot, “pitch” blade up & down, and raise blade tip up &
down to remove trapped air.
7. Remove drain hose assembly and (top) bleed fitting, and install B289-2 bolt. Roll
the blade over. After five minutes, inspect the boot for leaks. If no leaks are found,
close valves, remove fill hose assembly brass valve and (bottom) bleed fitting, and
install other bolt.
8. Torque B289-2 bolts per Section 20-33 and torque stripe per Figure 5-1.
9. Repeat steps for opposite blade.
SEP 2012 R66 Maintenance Manual Chapter 12 Servicing Page 12.15
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