Proprotor System

Question 1

Diameter of proprotor assembly

Answer 1

38 feet

Question 2

MV-22 blade twist

Answer 2

47.5 degrees

Question 3

Pendulum damper weights

Answer 3

Total of 3, Attached to the yoke at the end of the spindle and are designed to reduce rotor induced 3 rev vibrations. They are approx. 50 lbs each

Question 4

Slip ring assembly

Answer 4

located within the rotating mast of the proprotor, and provides electrical power to the proprotor

Question 5

Proprotor Sensors

Answer 5

1. Blade Flapping Sensors2. RPM/Azimuth Sensors3. Mast Torque Sensors

Question 6

Blade Flapping Sensors

Answer 6

Send a signal to the FCCs which respond with cyclic pitch inputs through the swashplate adaptors to reduce excessive blade flapping.

Question 7

Proprotor Hub Assembly

Answer 7

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

Question 8

What allows blade flapping

Answer 8

The Constant Velocity Joint

Question 9

Which cockpit instrument continuously displays rotor rpm from signals received from the RPM/Azimuth sensors

Answer 9

Standby Flight Display

Question 10

FFR Indicator

Answer 10

Feathering/Flapping/Rotor Load Indicator - At the lower left corner of the PFD/VSD when the nacelles are above 35 degrees. It provides an indication of current and trending rotor loads and calculated elastomeric bearing temperatures, and the effects of corrective action applied by the pilot.

Question 11

FFR Indicator Outer Caret

Answer 11

Indicates the current calculated most critical elastometric bearing temperature. The rate at which the outer caret moves in indicative of the driving parameter for temperature. A moderate rate is related to flapping while a slow rate is related to feathering.

Question 12

FFR Indicator Inner Arrow

Answer 12

Indicates the current rotor load and provides trend information for the critical bearing temperature. For temperature it represents the future position of the outer caret.

Question 13

What triggers an RPM LOW Warning

Answer 13

Nr is less than 80.9% in APLN Mode or less than 94.7% in VTOL or CONV mode

Question 14

What triggers FEATHERING HIGH HOT Caution

Answer 14

FCC calculates bearing temperature based on swashplate commands, flapping and duration and alerts the crew when that value is within 20 degrees of damaging temperatures

Question 15

FLAPPING CRITICAL Caution

Answer 15

There may have been hard contact of the rotor hub, rotor blades, or rotating drive system components with each other or the mast. Continued operation could result in rotor, rotating controls, or mast system failure.

Question 16

FLAPPING HIGH HOT Caution

Answer 16

Indicates heating of the flapping bearing.

Question 17

What triggers FLAPPING HIGH HOT Caution

Answer 17

FCC Calculates bearing temperature based on total flapping duration and OAT and alerts the crew when that value is within 20 degrees of damaging temperatures

Question 18

What triggers PRTR OVERTORQUE Caution

Answer 18

Proprotor torque greater than 132% for 5 seconds or immediately upon 150%.

Question 19

What triggers RPM HIGH Caution

Answer 19

Proprotor rpm has exceeded 113%

Question 20

The flight control system uses ___ as a backup for Nr if the Nr sensors fail

Answer 20

Np sensors

Question 21

What triggers FEATHERING HIGH Advisory

Answer 21

FCC calculates bearing temperature based on swashplate commands, flapping duration and alerts the crew when this value is within 40 degrees of damaging temperature.

Question 22

What triggers the FLAPPING HIGH Advisory

Answer 22

FCC calculates bearing temperature based on total flapping duration and OAT and alerts the crew when that value is within 40 degrees of damaging temperatures