Proprotor

VTOL nacelle setting

85 to 96 deg

CONV nacelle setting

1 to 84 deg

APLN nacelle setting

0 deg

How many proprotor blades are there?

3 each side

Diameter of proprotor disc

38 ft

Colors on proprotor blades

Red, green, white

Proprotor major components

Spinner, blades, pendulum damper, slip ring assembly, proprotor hub, swashplate

What does the spinner assembly do?

Provides an aerodynamic contour from the proprotor fairings to the nacelles and an environmental covering to protect the proprotor hub assembly and rotating controls

Proprotor blade twist

47.5 deg

Proprotor blade spar shape

D-shaped

What is the proprotor blade designed to do if it strikes the ground during emergency landings?

“Broomstrawing”

How much coverage does the leading edge anti-ice strip provide?

1 in chord-wise

Where are the heater elements bonded to on the proprotor blades?

Upper and lower surface

What covers the proprotor blade’s leading edge?

Titanium abrasion strip

What is bonded to the titanium abrasion strip on the outboard end of the blades for increased protection?

Nickel cap

Where are blade tip lights located?

Top and bottom of the blade tip

What is the pendulum damper assembly designed for?

Reduce rotor-induces 3/rev vibration

What is the rigid mount for the pendulum damper weights?

Yoke

How many pendulum damper weights are there?

3 per proprotor

How much do the pendulum damper weights weigh and what are they made of?

50 lbs and tungsten

How many flapping sensors are there?

3 per proprotor

Where are the flapping sensors mounted?

Yoke assembly

What does the slip ring assembly do?

Allows for the transmission of power and electrical signal from a stationary to a rotating structure

What types of sensors do the proprotors have?

Blade flapping, RPM/azimuth, and mast torque

How is Nr measured?

RPM sensors are mounted on the non-rotating portion of the slip ring assembly and detects the rotational speed of the slip ring rotor

How many RPM/azimuth sensors are there?

3 per nacelle

How many mast torque sensors are there?

6 per nacelle

Where are the mast torque sensors located?

Bonded to the inside of the proprotor mast

What type of gauge are the mast torque sensors?

Strain gauges

What type of sensors are the RPM/azimuth sensors?

Monopole sensors

What mast torque is displayed on the MFDs?

Average mast torque

What does the proprotor hub assembly do?

Transmits flight control movements to the proprotor blades and transmits drive torque at a uniform rotational velocity

What attaches the blade to the hub yoke?

Grip assembly

What does the yoke assembly limit?

Lead, lag, and flapping

What does the grip assembly allow for?

Limited feathering movement for blades for changing blade AoA

Primary load path for centrifugal force from the blades to the yoke?

Through the CF bearing to the spindle assembly to the yoke

Secondary load path for centrifugal force from the blades to the yoke?

Through the grip assembly and the beam assembly

Where are the pitch horns located?

Bolted to the trailing edge of each proprotor grip assembly

How are control inputs transmitted to the blades?

Swashplate to the pitch change links to the pitch horns

What allows for flapping?

Constant velocity joint

How long is the mast splined drive tube?

20 in

How many pitch change links are there?

3 per nacelle

What does the anti-drive assembly do?

Prevents the non-rotating ring from rotating while allowing the swashplate assembly to move for collective and cyclic control inputs

Where do the swashplate actuators transmit control inputs?

Non-rotating swashplate

Where does the non-rotating swashplate transmit control input?

Rotating swashplate

When is the FFR displayed on the PFD/VSD?

Nacelles greater than 35 deg

What does the outer caret on the FFR represent?

Current calculated most critical elastomeric bearing temperature

What does the inner caret on the FFR represent?

Current rotor loads and trend information for critical bearing temperature