cover plate on the propeller hub. This arrangement is
The electronic pitch indicator system also contains
shown in view A of figure 3-11. The electronic pitch
a stationary electronics cabinet, rotary transformer, and
indicator receives an input from a sensor assembly
rotating electronics cylinder. The stationary electronics
mounted inside the propeller hub, as shown in detail in
cabinet is mounted adjacent to the OD box. It contains
the circuitry to provide a 10-kHz excitation signal to,
view B of figure 3-11. The sensor (wand) extends from
the small electronics package (handle) located in the hub
and receive a propeller pitch position feedback signal
from, the rotary transformer. The cabinet also has two
cone and cover into an axial hole drilled into the piston
light emitting diode (LED) displays that show propeller
rod. The hole contains a magnetic ring that allows the
pitch in both feet and percent of design ahead and astern
sensor to measure propeller pitch position.
pitch. The rotary transformer contains both the
Figure 3-11.—Hub-mounted electronic pitch position transducer.
3-15
