Transmission and Drive

Question 1

The transmission is attached to the fuselage structure by a ________ and _________________ and is lubricated by its own oil system.

Answer 1

• lift link

- 5 vibration-isolating mounts

Question 2

The purpose of the transmission and drive system is to transmit the ______________ from the engines to the main and tail rotors. This is done via a series of _________ and __________.

Answer 2

• rotational energy (torque)

- drive shafts and gearboxes

Question 3

This gearbox is mounted at the top of the vertical fin.

It changes the direction of drive and reduces the output RPM to the tail rotor.

Answer 3

90 degree Gearbox

Question 4

It is located at the base of the tail fin on the boom and changes direction of the tail rotor driveshaft.

Answer 4

42 degree Gearbox

Question 5

The __________________ is installed between the combining gearbox and transmission input drive quill.

Answer 5

K-flex main drive shaft assembly

Question 6

Transmission: The main drive shaft transmits torque from the CGB to the transmission input quill. The engines produce more combined power than the transmission is capable of handling. The transmission is limited to ________ by the ______________.

Answer 6

• 1,290 SHP

- Torque Control Unit (TCU)

Question 7

A ______ is attached between the forward underside of the support case and a lateral fuselage beam near the aircraft’s longitudinal center of gravity.

Answer 7

lift link

Question 8

• Rotor brake drive quill (_________).
• No. 1 hydraulic pump/Nr tachometer generator drive quill (________).
• No. 2 hydraulic pump drive quill (_________).

Answer 8

• 4,300 rpm
• 4,300 rpm
• 6,600 rpm

Question 9

Mast:

Tubular steel construction rotating at ____ rpm. ____ bearings provide vertical support.

Answer 9

• 324

- Two

Question 10

Mast: Four splined areas:

Answer 10

• Under mast bearing: Driven by upper planetary gear assembly.
• Scissors and sleeve.
• Hydraulic dampers.
• Main rotor hub.

Question 11

Where is the free-wheeling clutch located on the transmission?

Answer 11

Transmission input drive quill.

Question 12

In addition to driving the mast, secondary gear trains in the transmission drive what components?

Answer 12

Rotor brake quill
No. 1 hydraulic pump and rotor tachometer drive quill
No. 2 hydraulic pump drive quill
Tail rotor drive quill.

Question 13

Pressure Switch: Illuminates XMSN OIL PRESS LIGHT when less than _____.

Answer 13

30 psi

Question 14

Where is the transmission oil cooler?

Answer 14

Behind the combining gearbox (CGB) and above the engine oil cooler.

Question 15

What does illumination of the XMSN OIL HOT caution light indicate?

Answer 15

The transmission oil temperature is above 110°C.

Question 16

There are __ hangers:

•There are __ in the tail boom and __ on the aft portion of engine deck.

Answer 16

• 4
• 3
• 1

Question 17

42° Gearbox:

Sight glass with _______ pint capacity

Answer 17

0.375

Question 18

90° Gearbox:

______ gear reduction.

Splash lube system with an oil capacity of ______.

Answer 18

• 2.6:1

- 0.5 pint

Question 19

What is the purpose of the 42° intermediate gearbox?

Answer 19

Provides a 42° angle of drive change with no gear reduction.

Question 20

What is the purpose of the 90° tail rotor gearbox?

Answer 20

Provides a change in direction of drive (90°) and a 2.6:1 speed reduction between the input drive shaft and the output shaft where the tail rotor is mounted.

Question 21

Input torque to the transmission is limited to __________ shaft horsepower (SHP).

Answer 21

1,290

Question 22

What does illumination of the XMSN OIL PRESS caution light indicate?

Answer 22

The transmission oil pressure is below 30 psi.