Hartzell HC-E3YR-7 Owner's Manual page 66

(b) This occurrence could be unsettling to the pilot and
could cause unwanted and severe movement of the
aircraft causing property damage.
1
G. Sixth, pilot selects blade angle as required to obtain the
desired thrust direction for maneuvering.
H. Seventh, return the Pilot Control to the original position past
the catch or detent out of beta range after maneuvering is
complete.
DESCRIPTION AND OPERATION
Propeller Owner's Manual
Use of one lever only during beta range
operation is strongly recommended because
using two levers (adding the throttle control
lever) introduces the strong possibility that the
pilot will inadvertently have the throttle at high
power while moving the propeller blade angle
through neutral pitch (blade angle) and cause
overspeed and the unwanted consequences
(damage) described in paragraph 2.F.(1).
136
61-00-36
Page 2-18
Rev. 2 Feb/17