CHAPTER 12
SERVICING
12-10 Main Rotor Gearbox
WARNING
Refer to appropriate Material Safety Data Sheet (MSDS) and
take necessary safety precautions when working in proximity
to hazardous materials.
12-11 Servicing
NOTE
Inspect main rotor gearbox and gearbox lubrication system for
leaks when “top off” is required.
NOTE
Verify aircraft is on level ground when evaluating gearbox oil
level.
A. Draining Fluid
1. Refer to Figure 12-1. Disconnect chip detector wiring, as required. Remove chip
detector from housing.
2. Refer to Figure 12-2. Insert MT054-1 drain assembly into chip detector housing.
Position drain hose overboard into a suitable drain container. Jam wedge between
support panel stiffener and drain assembly fitting to open valve.
B. Adding Fluid
1. Install chip detector per Section 12-13, if removed.
2. Refer to Figure 12-1. Remove gearbox filler-plug. Fill gearbox with A257-22 lubricant
to center of sight glass.
3. Rotate rotor system by hand for several revolutions and pull down on tail rotor
gearbox several times. Check gearbox oil level and adjust level as required.
4. Install filler-plug and special torque plug per Section 20-33.
5. Run-up helicopter approximately five minutes at 60-70% RPM per R66 Pilot’s
Operating Handbook (POH) Section 4.
6. Check gearbox oil level, and adjust level per steps 2 thru 6 as required.
SEP 2012 R66 Maintenance Manual Chapter 12 Servicing Page 12.1
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