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Heli > Mod 6 Free wheels and clutches > Flashcards

Mod 6 Free wheels and clutches Flashcards

1
Q

Type of aircraft that need a clutch.

A

Direct turbo - shaft turbine

Piston engine

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2
Q

A manual clutch is engaged by

A

The Pilot

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3
Q

A helicopter with two free-turbine engines (such as a Bell 212 or Eurocopter AS355) will have:

A

No clutch and two freewheels

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4
Q

The freewheel unit on a Bell 206 is mounted on the engine; however it is lubricated by the transmission. Why?

A

In case of an engine failure, the freewheel unit wont run out of lubrication.

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5
Q

The dual tach on a piston engine powered helicopter would indicate:

A 
Engine speed 
Rotor speed (Nr)
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6
Q

What system allows the transmission speed to exceed the speed of the engine?

A

Freewheel unit

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7
Q

location of the freewheel on helicopters without clutch

A

is located right after or downstream of the engine

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8
Q

Location of a freewheel on helicopter with clutch

A

right after downstream of the clutch

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9
Q

types of freewheels units

A

Ramp and roller type

sprag assembly

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10
Q

freewheels lubrication types

A

internal or self contained

external (main gearbox)

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11
Q

different names for a freewheels

A

Bell Freewheeling unit or Freewheeling Assembly
Hughes / McDonnell Douglas Overrunning Clutch
Robinson Sprag Clutch
Eurocopter & Turbomeca Free Wheel

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12
Q

freewheel is used on a helicopter to allow the engine

A

to drive the rotor system, however prevent the rotor system from driving the engine.

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13
Q

clutch purpose

A

unload the engine during start

allows the engine to be disconnected from the drive train.

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14
Q

clutch location

A

Typically, the clutch can be found in the drive line right after the engine, however before the freewheeling unit.

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15
Q

Automatic Clutches are grouped into two categories

A

Wet:A wet clutch is one that runs in oil. Oil is used to provide cooling. the clutch run in oil from the transmission.
Dry:A dry clutch uses air for cooling.

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16
Q

manual clutch need lubrication ?

A

no, Manual clutches using belts require no lubrication on the belts. The belts should be kept clean and dry.

17
Q

Why The pilot must engage the clutch system as soon as possible after engine start

A

to prevent excess wear on the belts and sheaves.

18
Q

types of gearbox

A

main rotor gearbox
tail rotor 90 gear box
intermediate 42 gearbox
combining gearbox (multiengine)

19
Q

main gear boxes are?

A

speed decreasing

20
Q

The most common power limitation in a helicopter is due to

A

main gearbox limitations

21
Q

tail rotor gearbox is most but not all

A

are speed decreasing

22
Q

intermediate gear box

A

Little or no change in speed, only a change in direction

23
Q

combining gear box

A

Used on Multi-engine helicopters. Combine the output of two (or more) power plants into a single output

24
Q

the pylon on R22 and bell 206 includes ?

A

mast
main rotor
main gearbox

25
Q

the pylon must?

A

support the weight of the helicopter
manage the vibration from the main rotor
manage movement between the rotor and air frame

26
Q

Bell 206 MRGB includes ?

A

pin drag pin assembly ( spike mount)
Pylon support links (A frame)
insulation mount

27
Q

free turbine engine what is N1 or Ng?

A

Gas Producer Speed”

–The speed of the Compressor and Gas Produce Turbine wheels(often reads in percent)

28
Q

Free turbine engine what is N2 or Nf

A

Free Turbine Speed” –The speed of the “Free” or “Power” Turbine(often reads in percent)

29
Q

exhaust gas temperature gauge

A

EGT, TOT, ITT, T4
inter-turbine temperature (ITT),
exhaust gas temperature (EGT),
turbine outlet temperature (TOT).

30
Q

Torquimeter

A

gauge often reads in PSI or percent

31
Q

Engine air filtration

A 
Barrier type filter 
Particle Separate ( centrifugal swirl tubes) Turbine
32
Q

Coupling function

A

Allow for movement between drive train components.

33
Q

Coupling types

A

Flexible (Thomas, Bendix, K-flex)

Greased (Bell 206 engine to transmission, and Bell Medium tail rotor drive )

Heli (5 decks)

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