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THIS IS AN UNCONTROLLED DOCUMENT.
THIS ELECTRONIC DOCUMENT MAY HAVE BEEN SUPERCEDED.
THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA JANUARY 2003
MAIN ROTOR MAST
The main rotor mast is a hollow steel tube that transmits rotary motion from the transmission
to the main rotor. The mast has three sets of splines, and a flange. The lower splines
fit into the transmission planetary carrier to provide the mast drive source. The center
splines are master splined and drive the rotating portion of the swashplate. The upper
splines and flange drive the main rotor. The mast is mounted to the top of the transmission
and extends downward through the transmission into the mast alignment bearing. The
mast is supported in the transmission by a single ball bearing, bearing liner, and retainer.
The lower end of the mast is machined to a finish that serves as the lower mast alignment
bearing inner race. The mast alignment bearing is a roller bearing mounted in the lower
mast bearing case.
UPPER
SPLINES
AND
FLANGE
LOWER
SPLINES
MAST
BEARING
CAP
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