Powertrain

Question 1

Which transmissions do not have auxiliary lubrication system?

Answer 1

Engine XSMN

Question 2

How can you identify low oil pressure in the aft vertical shaft?

Answer 2

Maintenance Panel and WCA

Question 3

What indications will the crew have when a debris screen is bridged with conductive particles?

Answer 3

Debris indication on EICAS, Maintenance Panel, and WCA

Question 4

The _____ lubrication system lubricates the main generators.

Answer 4

AFT XSMN Main

Question 5

What should you do if you find an engine or combining transmission oil quantity indication low and the aircraft has been shutdown for more than 30 minutes?

Answer 5

5 min Ground Test then recheck

Question 6

What is the purpose of the 9 and 4 degree tilt in the fwd and aft transmissions?

Answer 6

Aids in Ground Handling and Ground Taxiing.

Question 7

What is the location of the temperature/thermal switch that turns on the ENG 1 or ENG 2 XSMN warning?

Answer 7

Bottom of the ENG XSMN

Question 8

The fluid levels in the combining and engine transmissions should be checked within ____ minutes after engine shutdown.

Answer 8

30

Question 9

Why must you reduce the electrical load if the AFT XSMN OIL HOT caution light is active?

Answer 9

Aft XSMN main lubrication system lubricates and cools generators

Question 10

What will happen if the maintenance panel is tested in-flight?

Answer 10

Same as ground

Question 11

What is the emergency procedure for the ENG1 or ENG2 XSMN warning active?

Answer 11

-EMER ENG SHUTDOWN

-[F] Affected ENG XMSN- Check

LAND AS SOON AS POSSIBLE

Question 12

How many synchronizing drive shafts are installed on the CH-47?

Answer 12

9 (7 FWD,2 AFT)

Question 13

Exceeding VNE with the LCT retracted places excessive stress on what component?

Answer 13

Thrust Bearing

Question 14

What items in the drive-train system allows the shaft assemblies to flex?

Answer 14

Layered Steel Plates
(Flex-couplings)

Question 15

What reduces vibrations between drive shafts and the aircraft?

Answer 15

Lord Mounts/Elastomer Shock Mounts

Question 16

The quill shafts are located where?

Answer 16

Between the engines and their repsective transmissions

Question 17

What is displayed if the pressure in an ENG XMSN is greater than 90 psi?

Answer 17

ENG1 or ENG2 XSMN PRESS HI advisory

Question 18

What temperature does the ENG1, ENG2, FWD, COMB, and AFT XSMN OIL HOT cautions become active?

Answer 18

140 deg C

Question 19

Where is the cooling air drawn in through for the FWD XMSN oil cooler?

Answer 19

Air inlet duct around the synchronizing shaft on the rear of the FWD XMSN

Question 20

What is the purpose of the Power Train system?

Answer 20

To transmit the power from the engines to the rotors

Question 21

What temperature does the ENG1 or ENG2 XSMN warning become active?

Answer 21

190 deg C

Question 22

How many transmission are in the Power Train system?

Answer 22

5

Question 23

When the engine transmission filter differential pressure indicator extends, can the button be reset at the time?

Answer 23

No

Question 24

When the COMB XSMN OIL HOT caution is displayed, how is the POWER TRAIN page temperature indication displayed?

Answer 24

Red

Question 25

The left oil pump on the combining XSMN is used for which transmissions?

Answer 25

COMB XSMN main system and the #1 ENG XSMN

Question 26

At what psi does the maintenance panel MAIN PRESS LO indicator illuminate?

Answer 26

When pressure drops below 20 psi

Question 27

What drives the forward XMSN oil cooler fan?

Answer 27

Transmission driven

Question 28

What automatically eliminates nuisance chip indicator lights caused by minute particles in the transmission oil system?

Answer 28

Fuzz Burn-off System

Question 29

The aft transmission cooler is located where?

Answer 29

Rear of the AFT XSMN (shaft driven fan)

Question 30

The AFT XSMN main filter bypass visual indicator must be installed how?

Answer 30

Within 30 deg of vertical, and at the top of the filter housing

Question 31

What components are NOT lubricated by the aft transmission auxiliary lubrication system?

Answer 31

Generators and aft shaft

Question 32

Describe the combining transmission lubrication system.

Answer 32

Consists of a left and right pump.

Left-lubricates Eng 1 XMSN and serves as primary lubrication for COMB XMSN

Right- lubricates Eng 2 XMSN and serves as auxiliary lubrication for COMB XMSN. The right pump assembly is not routed through a cooler

Question 33

General Rule: Name for component that gives Oil Temp Readout and Caution

Answer 33

Probe and Switch

Question 34

General Rule: Name for component that does Oil Pressure Readout and the Oil Pressure Caution

Answer 34

Transmitter/Transducer and Pressure Switch (shiny)

Question 35

Where is the transmission temp caution measured at and where is the engine transmission warning measured at

Answer 35

Caution: 140° C at Reservoir
Warning: 190° C at Eng Transmission (Eng XSMN Thermoswitch)

Question 36

Is the fuzz burn-off module attached to any debris screens?

Answer 36

No, only chip detectors

Question 37

Where is the cooling air drawn in through for the forward transmission oil cooler?

Answer 37

Air is drawn through the air inlet duct around the synchronizing shaft

Question 38

what drives the forward oil cooler fan

Answer 38

the transmission/ No.1 drive shaft

Question 39

where is the aft transmission oil cooler

Answer 39

moiunted between the main generators on the aft section

Question 40

the aft transmission main oil pump supplies oil to which components on the aft transmission

Answer 40

aft XMSN gears and bearings, aft vertical shaft thrust bearing and the main AC generators

Question 41

the aft transmission main filter bypass visual indicator must be installed how

Answer 41

within 30° of vertical, and at the top of the filter house

Question 42

Exceeding VNE with the LCT retracted places excessive stress on what component

Answer 42

Thrust Bearing