The drive system delivers torque from the
engines to the rotary-wing heads and blades.
It also drives the ac generators and pumps for
the flight control and utility hydraulic systems.
The drive system consists of five transmissions, drive
shafting to connect the transmissions, and an aft rotor
An engine transmission is mounted on the front
of each of the two engines. Torque is transmitted
from the engine to the transmission by a splined
Output torque from each engine transmission
is delivered through an engine drive shaft to
the combining transmission. The combining
transmission combines the torque from both
engines and transmits it to a forward transmission
and an aft transmission through drive shafting.
The forward transmission is splined directly to
the rotary-wing head to drive the forward rotor
The aft transmission drives a separate vertical
aft rotor shaft. This shaft is splined to the aft
rotary-wing head to drive the aft rotor blades.
The forward drive shafting consists of seven
aluminum tubes joined by flexible adapter
assemblies. The tubes are referred to as No. 1
thru No. 7, beginning at the forward end of the
shafting. The shafting is supported in a bearing
at each adapter assembly by two rubber and
The aft drive shafting consists of two aluminum
tubes joined by a flexible adapter assembly. The
tubes are referred to as No. 8 (forward) and No.
9 (aft). The shafting is supported in a bearing at
the adapter assembly by two rubber and metal