Transmission System

Question 1

The main function of the transmission system is to ____________________.

Answer 1

take the combined power from the two engines, reduce the rpm, and transfer it to the main and tail rotors.

Question 2

The secondary function of the transmission system is to _______________.

Answer 2

provide a drive for electrical and hydraulic power generation.

Question 3

The tail driveshaft consists of ___ sections with a ________ at the fold hinge.

Answer 3

6, disconnect coupling

Question 4

The tail rotor shafts are ______ and suspended at four points by _____.

Answer 4

ballistically tolerant, viscous-damped bearings

Question 5

The MGB is of a _____ design with a built-in __ degree forward tilt.

Answer 5

modular design, 3

Question 6

The rotor brake is toothed to provide ___________.

Answer 6

the means for positioning the main rotor head for blade folding.

Question 7

Each of the input modules contains ______ and ______.

Answer 7

input bevel-pinion gear and free wheeling unit

Question 8

The freewheeling unit allows each engine to be disengaged from the transmission when ____________.

Answer 8

Nr exceeds Np (autorotation)

Question 9

The engine output shaft provides drive from the engine to the input module via the ______.

Answer 9

diaphragm coupling

Question 10

The diaphragm coupling is designed to ___________________.

Answer 10

allow for slight angular or axial misalignment of the engine output shaft during operation.

Question 11

If _____________during rotor engagement, shut down the engine immediately. Whining noise may be an indication of a pending ________. Do not operate engine until appropriate troubleshooting has been performed to locate the source of the whining noise. If incorrect installation of diaphragm coupling is the source of the whining noise, further engine operation could result in diaphragm coupling failure.

Answer 11

an abnormal or loud whining noise is heard, diaphragm coupling failure

Question 12

Caution: A loud or abnormal whining noise may be an indication of __________.

Answer 12

a pending diaphragm coupling failure

Question 13

Each accessory module provides mounting for ___________.

Answer 13

an ac electrical generator and hydraulic pump module

Question 14

Which sensors are located on the right and left accessory modules?

Answer 14

An Nr sensor for the vertical instruments is mounted on the right accessory module. The Nr sensor for the TDI and main transmission low-oil pressure sensors are mounted on the left accessory module.

Question 15

How are the intermediate and tail gearboxes lubricated?

Answer 15

The are splash-lubricated

Question 16

The TGB enables pitch changes of the tail rotor blades through the flight control system and has a __________.

Answer 16

built-in 20 degree left tilt

Question 17

What type of lubrication system does the main transmission system have?

Answer 17

an integral wet sump lubrication system

Question 18

The _______ also use transmission oil for cooling

Answer 18

ac generators on the accessory modules

Question 19

The transmission oil impending bypass PDI is located _______.

Answer 19

above the sonobouy launcher

Question 20

An extended PDI is an indication that ________. It is not ______.

Answer 20

maintenance action is required after the last flight of the day. It is not a lubrication system malfuntion.

Question 21

________ is required to reset the transmission oil impending bypass PDI.

Answer 21

Replacement of the filter

Question 22

The oil cooler uses a _____, driven by the _____, to cool the oil before it enters the various modules.

Answer 22

blower, rotor driveshaft

Question 23

Where is the oil pressure sensor (caution) located and why? When is it activated?

Answer 23

It is located on the No. 1 accessory module, which is the farther point from the pumps. Activated when main transmission oil pressure drops below 14 PSI.

Question 24

Pressure readings for the vertical instrument are taken at the _________.

Answer 24

MGB manifold inlet

Question 25

The main transmission oil temperature HOT caution is activated when:

Answer 25

main transmission oil temp goes above 117 degrees C

Question 26

Where is temperature for the vertical instruments sensed?

Answer 26

in the sump using a temperature sensor that is embedded in the main module sump chip detector.

Question 27

The main transmission chip detector system consists of ____ chip detectors.

Answer 27

5

Question 28

Where are all the chip detectors located?

Answer 28

Accessory chip detectors: in the return lines of the No 1 and No 2 accessory modules

Input module and main module chip detectors: in the main module

Question 29

How do the chip detectors work?

Answer 29

The chip detectors are magnetic plus that attract ferrous material. When a metal fragment completes the circuit, the appropriate caution will appear.

Question 30

Each chip detector has a _______, to eliminate false warnings created by fuzz and minute particles. This will deactivate when oil temperature is above _______.

Answer 30

burn-off feature, 140 degrees F

Question 31

How does the chip detector in the main module work?

Answer 31

It rests at the lowest point of the oil system, contains an embedded temperature sensor, and incorporates at 30-second delay to further eliminate false warnings.

Question 32

How are the IGB and TGB chip detectors different from the main ones?

Answer 32

They contain an embedded oil temperature switch