Power train and rotor

Question 1

What degree tilt in main transmission and why

Answer 1

3 degrees, helps relieve airframe stress in forward flight

Question 2

What are the 5 main transmission modules

Answer 2

Main mod, 2 input modules, 2 accessory mods

Question 3

What are some of the components on the accessory modules that pertain to this set

Answer 3

Low oil pressure sensor for transmission, NR sensors, mounting pads for generators and HYD pumps

Question 4

Where specifically is the pressure switch for the transmission located

Answer 4

Left accessory module

Question 5

Main transmission oil capacity?

Answer 5

7 gallons

Question 6

What is the difference between the rotor speed sensors?

Answer 6

Left (#1 side) provides data to DEC’s for transient droop compensation
Right (#2 side) provides data to DCU for EICAS to display

Question 7

When does the MAIN XMSN PRESS caution kick?

Answer 7

When pressure drops to 14 psi

Question 8

How long after shutdown to check xmsn oil dip stick on cold side?

Answer 8

2 hours.

Question 9

What is the xmsn bypass indicator in the cabin actual for?

Answer 9

for the xmsn oil filter bypass

Question 10

Where is the transmission oil pressure sensor?
Where is the trans oil pressure switch, how do these differ?

Answer 10

top/aft of the main mod, left of the tail rotor drive shaft
(In the pneumatic/fuel compartment, its the big cannon plug just left of the rotor brake wear indicators)

front side of the #1 accessory mod, on the edge of the generator. The switch generates the EICAS caution

Question 11

Where are the main mod and input mod chip detectors?

Answer 11

Bottom aft side of the main mod, where the bypass indicator is

Question 12

What does CHIP IBIT FAIL caution (also on the FMS air vehicle status page) actually mean?

Answer 12

One of the chip detectors has failed its built in test (BIT).
-This is in the FRC but it has no corrective action. Flyable?
-Test to find out which one.

Question 13

Where are sections 1, 2 and 3 of the driveshaft?

Answer 13

1 is the short chonk in the fuel/pneumatic compartment
2 is the entire rest of the driveshaft except for
3 is the last section above the tail, that adjoins with intermediate gearbox

Question 14

Where is the section 4 drive shaft?

Answer 14

Between the intermediate and tail rotor gear box

Question 15

How long can the intermediate gearbox and tail rotor gearbox run with a loss of all oil?

Answer 15

30 minutes

Question 16

What connects the primary servos to the rotor system?

Answer 16

The lateral, aft, and forward control rods

Question 17

What does the swashplate do?

Answer 17

Transmit control inputs from the primary servos/control rods to the 4 pitch control rods

Question 18

Swashplate assembly

Answer 18

A stationary and rotating disc. Three major areas
-Swashplate bearing
-Uniball bearing
-Controls

Question 19

What that swashplate bearing do?

Answer 19

Separates stationary and rotating swashplates

Question 20

What is the spindle module?

Answer 20

conical assembly where blades attach to hub. contains elastomeric bearings

Question 21

What is the anti flap assembly?

Answer 21

4 spring loaded locks on the top of each spindle module, prevent flapping at NR below 35%

Question 22

Whats a lead stop?

Answer 22

device on forward edge of elastomeric bearing endplate. limits lead of blades as rotor brake is applied

Question 23

What do dampers do?

Answer 23

limit lead/lag motions (hunting) keeping blades in proper position to one another
Allow for 17 degree lag, 3 degree lead

Question 24

tip cap angles

Answer 24

20 degree droop, 30 degree sweep

Question 25

bifilar purpose

Answer 25

Absorbs vibrations, extends other component life

Question 26

Whats T/R QUAD FAIL mean

Answer 26

your quadrant cables connecting the tail rotor control are snapped.

Check controllability.