Rotary Week 3
When referring to gear reduction ratio, which of the following will provide the slowest output speed?
16:1
8:2
1:8
1:16
Due to the use of the Allison 250-C20 Free-power turbine engine, what device not required to be included in the powertrain of this helicopter?
A Freewheeling Unit
Gear Reduction
A Centrifugal Clutch
A Drive Shaft
Which component in the Bell 206 Transmission Mount assembly contains elastomeric construction?
The Isolation Mount
The Pylon Links
The Pylon Deck Mount Pads
The Spherical Bearings
Which device is designed to prevent unlimited movement of the transmission in all directions?
The Pylon Links
The Isolation Mount
The Spike and Stop Plate
The Spherical Bearings
Which device on the Bell 206 Transmission Mount assembly will return the mast to its original position once loads or forces are removed?
Pylon Link
Spike and Stop Plate
Transmission Drive Shaft
Isolation Mount
What causes scratches or gouging on the top of the isolation mount?
The aft flange of the transmission to driveshaft coupling
The aft flange of the engine to driveshaft coupling
The transmission spike
Over-speeding of the Transmission Driveshaft
How will maintenance personnel ALWAYS know if the Bell 206 mast has had excessive flapping action?
Dents in the soft aluminum stop plate caused by the spike on the bottom of the transmission
The emergency impact switch in the flight data recorder
The logbook entry from the pilot
The G-force Meter on the instrument panel
What type of gears are in this?
Bevel Gears
Tapered Bevel Gears
Planetary Gears
Spiral Bevel Gears
What is the purpose of this type of gear assembly shown?
Maintain rotational speed and change direction
Change rotational speed and maintain direction
Change rotational speed and direction
What is another name for the smaller gear in this illustration?
Input Pinion Gear
Ring Gear
Sun Gear
Planetary Gear
What is the name of the gear system shown in this illustration?
Planetary Gears
Spiral Bevel Gears
Solar Gears
Bevel Gears
What is the name of the Green coloured component in this illustration?
Planetary Gear Cage
Planetary Gear
Sun Gear
Ring Gear
What is the name of the Grey coloured component in this illustration?
Planetary Gear
Ring Gear
Sun Gear
Planetary Gear Cage
What is the name of the Red coloured component in this illustration?
Ring Gear
Planetary Gear
Planetary Gear Cage
Sun Gear
What is the name of the Blue coloured component in this illustration?
Ring Gear
Sun Gear
Planetary Gear Cage
Planetary Gear
In this illustration what is the colour of the rotating component that will move the slowest assuming the ring gear is fixed and not rotating?
Red
Grey
Green
Blue
Which of the following gears inside the Bell 206 Transmission does not rotate?
Planetary Gear
Pinion Gear
Sun Gear
Ring Gear
How many engines does the AS355 have to drive the Transmission?
1
2
3
4
How is the engine torque or rotational force transferred to the transmission of the AS355?
A belt drive system from each engine
Directly from the engines into the transmission
From the each engine to a combining gearbox then to the transmission
The engines mount directly onto the transmission
How is the majority of the vibration and movement of the main rotor and transmission dealt with on the AS355?
A Thomas coupling assembly at each end of the drive shaft
A Curvic coupling at each end of the drive shaft
A Universal Joint or Gimbal at the engine outlet end of the Outer Driveshaft Housing
A Universal Joint or Gimbal at the transmission end of the Outer Driveshaft Housing
How many rigid Suspension Bars support the weight of the helicopter and secure the transmission to the AS355 helicopter?
2
3
4
5
What allows for forward and aft left and right flapping movement of the mast and main rotor on the AS355?
A flexible suspension cage below the transmission
A pylon mount on each side of the transmission and an isolation mount at the back of the transmission
The transmission is rigid mounted and the mast has a flexible gimbal assembly where it mounts into the transmission
There is no flapping of the mast and main rotor as the main rotor is fully articulated
How many suspension mount pads attach the transmission to the deck of the AS355?
1
2
3
4
What are the suspension mount pads made of on the AS355 helicopter?
A composite carbon fiber and Kevlar pad
Laminated rubber and metal plates
A steel and magnesium alloy riveted pad
A solid rubber pad
Where is/are the freewheeling unit(s) located on the AS355 helicopter?
Attached to the outlet of each engine gearbox
Inside the inlet of the combining gearbox
Inside the inlet of the transmission
Inside the outlet of the combining gearbox
What do the intermediate gears drive in the AS355 combining gearbox?
Oil Pumps
N1 & N2 Tachometer Generators
Hydraulic Pumps
Starter/Generators
What other optional accessory does the input pinion gear drive on the combining gearbox?
Air Conditioning Compressor
Hydraulic pump for the cargo hook
Engine Cycle Counter
Stand-by Generator
What is the purpose of the 3 removable plugs on the AS355 combining gearbox?
Borescope Inspection
Gear lubrication
Installing accelerometers for vibration analysis
Gear replacement
How many stages of gear reduction are inside the AS355 Main Rotor Gearbox and what are they?
2 stages both planetary gears
2 stages one beveled and one planetary gear assemblies
1 stage planetary gears
2 stages both beveled gears
What kind of gear is the input pinion gear on the AS355 main rotor gearbox?
A straight cut bevel gear
Spiral cut spur gear
Spiral cut bevel gear
Spiral cut worm gear
What is the function of the bevel gear set inside the ES355 Transmission?
Reduce the speed of rotation
Change axis of rotation 90 degrees
Transfer the rotational force of the engine to the Rotor system
All of the above
What does the small shaft splined to the inside of the sun gear going down to the bottom of the AS355 Main Rotor Gearbox drive?
Hydraulic Pump
The Main Rotor
N1 Tachometer Generator
Oil Pump (Internal)
In the Illustration provided which item does NOT rotate
2
3
4
5
In the Illustration provided, what is the name of item # 1?
Sun Gear
Planetary Spur/Pinion Gear
Planetary Gear Cage
Ring Gear
Mast
In the Illustration provided, what is the name of item # 4?
Sun Gear
Planetary Spur/Pinion Gear
Planetary Gear Cage
Ring Gear
Mast
In the Illustration provided, what is the name of item # 5?
Sun Gear
Planetary Spur/Pinion Gear
Planetary Gear Cage
Ring Gear
Mast
If the main chip detector light for the rotor gearbox located on the instrument panel illuminates, which of the following is NOT something that would have causes such an action?
Picking up a filing from the aluminum main rotor gearbox case
Picking up a filing from the sun gear
Picking up a filing from one of the planetary spur/pinion gears
Picking up a filing from the input spiral beveled pinion gear
What type of oil pump is used in the AS355 main rotor gear box?
Piston type constant displacement
Gear type constant displacement
Gear type variable displacement
Piston type variable displacement
Which of the following directly drives the cooling fan providing air for the MRG oil coolers on the AS355?
The main rotor gearbox
The tail rotor drive shaft
Engine #2
The combining gearbox
Which of the following is one of the purposes of the Main Rotor Transmission
To drive the engine during autorotation
To transfer power from the main rotor to the engine
To drive the oil pump for the engine
To deliver engine to the main rotor mast
Which of the following is one of the purposes of the Main Rotor Transmission
To reduce rotation speed from the engine input to the mast output
To drive the engine during autorotation
To transfer power from the main rotor to the engine
To drive the oil pump for the engine
Which of the following is one of the purposes of the Main Rotor Transmission
To drive the engine during autorotation
To transfer power from the main rotor to the engine
To transfer lift from the blades to the airframe
To drive the oil pump for the engine
Which of the following gear types provides gear reduction in an inline plane?
Worm gear system
Helical cut bevel gear
Planetary gear system
Rack and pinion system
Which of the following gear types provides gear reduction and changes the plane of rotation 90 degrees?
Spur gear system
Planetary gear system
Rack and pinion system
Helical cut bevel gear
How many stages of gear reduction are in the transmission on the Bell 47and what is the type of gearing used to accomplish this reduction?
Two stages using two sets of planetary gears
Two stage using two helical bevel gear assemblies
Two stages using a helical bevel gear and a planetary gear assembly
Single stage using a helical bevel gear assembly
What will drive the Bell 47 main rotor transmission during normal operation?
A horizontally mounted piston engine with a coupling assembly driving a centrifugal clutch assembly
A horizontally mounted piston engine and belt drive assembly with a pilot activated tensioner
A vertically mounted piston engine with a coupling assembly driving a centrifugal clutch assembly
A vertically mounted piston engine and belt drive assembly with a pilot activated tensioner
Where is the freewheeling unit inside the Bell 47 Transmission?
It is at the inlet between the engine and the transmission
It has a centrifugal clutch so it does not need a freewheeling unit
It is in the first or lower-stage ring gear assembly
It is between the upper stage planetary gear cage and the mast
What rotates the drive gear for the tail rotor inside the transmission on the Bell 47?
First stage planetary gear cage
Second stage planetary gear cage
First stage bevel gear assembly
Second stage bevel gear assembly
Which of the following is another accessory output driven by the tail rotor drive gear on the Bell 47?
An oil pressure pump
The N1 tachometer generator
The sun gear
The main rotor tachometer
Which of the following is/are another accessory output(s) driven by the tail rotor drive gear on the Bell 47?
The generator
The N1 tachometer generator
The sun gear
An oil scavenge pump
Which of the following is another accessory output driven by the tail rotor drive gear on the Bell 47?
An oil pump
The N1 tachometer generator
The generator
The sun gear
What are the gear systems inside the transmission of the Sikorsky S-55 Transmission?
Two stages of spiral bevel gears
Two stages of planetary gears
One stage of spiral bevel gears and two stages of planetary gears
One stage of spiral bevel gears and one stage of Planetary gears
Where is the freewheeling unit located in the Sikorsky S-55?
At the first stage planetary system ring gear
Between the second stage planetary gear cage and the mast
At the outlet of the engine in the nose
In the input section of the main rotor gearbox
Which of the following is NOT an accessory driven by the Sikorsky S-55 Transmission?
Generator
Generator blower
Flight control Hydraulic Servo
Transmission drive shaft speed tachometer
Which of the following is NOT an accessory driven by the Sikorsky S-55 Transmission?
Main rotor brake system hydraulic pump
Rotor tachometer generator
Main gearbox oil pump
Generator
What are the gear systems inside the transmission of the Hughes 500 Transmission?
One stage of spiral bevel gears and one stage of Planetary gears
One stage of spiral bevel gears and two stages of planetary gears
Two stages of planetary gears
Two stages of spiral bevel gears
Which gear directly drives the output shaft for the tail rotor in the Hughes 500 Transmission?
The first stage input pinion gear
The second stage bevel ring gear
Engine Accessory Case Output Gear
The second stage pinion gear
Which stage or stages of gearing inside the Hughes 500 transmission will not only provide RPM reduction but also change the plane or axis of rotation?
The first stage of gear reduction
The second stage of gear reduction
Neither stage of gear reduction
Both stages of gear reduction
How many stages of gear reduction are inside the transmission of the Robinson R22?
0
2
1
3
Which of the following gear types provides gear reduction inside the transmission of the Robinson R22?
A single planetary gear system
A single spiral bevel gear set
Two sets of spiral bevel gears
Two sets of planetary gear systems
Which of the following is NOT a purpose of the Main Rotor Transmission on a helicopter?
Deliver engine torque to the main rotor mast
Reduce engine RPM to the mast
Transfer the lift from the main rotor system to the airframe
Increase the output RPM to the main rotor mast
What is the purpose of gears inside the helicopter transmission?
To increase the rotational speed from the input of the engine to the output to the main rotor
To decrease the rotational torque at the main rotor in comparison to the torque produced by the engine
To allow for both clockwise and counter clockwise or forward and reverse directional rotation of main rotor
To change the plane of rotation inside the transmission between the input and output; for example from horizontal to vertical
What type of gear is identified in the diagram below?
Bevel Cut Gear
Spiral Cut Bevel Gear
Face Cut Gear
Spur or Straight Cut Gear
What type of gear is identified in the diagram below?
Bevel Cut Gear
Spiral Cut Bevel Gear
Face Cut Gear
Spur or Straight Cut Gear
What type of load is depicted in the illustration below?
Horizontal load
Perpendicular load
Radial Load
Axial Load
What type of load is depicted in the illustration below?
Inner Cylinder
Inner Boss
Cage
Inner Race
Which type of bearing is commonly used for flight control linkages?
Thrust type bearings
Roller type bearings
Spherical rod end bearings
Tapered roller bearings
Which type of ball type bearing is commonly for thrust or axial loads in one direction?
Thrust type bearings
Roller type bearings
Spherical rod end bearings
Tapered roller bearings
What is the name of the “V” shaped device designed to carry the load of the helicopter?
The Pylon Mount Links
The Isolation Mount
The Spike and Stop Plate
The Spherical Isolation Mount Bearing
What of the items listed below is NOT driven by the smaller accessory gear inside the Bell 206 transmission?
Transmission Oil Pump
Tail Rotor Drive Shaft
Hydraulic Pump
Main Rotor Speed (Nr) Tachometer Generator
How do you align the Input Pinion Triple Thrust bearing and make certain they are installed correctly?
Direction of installation is not relevant
They come as a set bonded together
There is scribing on the outer race to form a shape of a V that points inward
There is a single line scribed on the inner race that must line up during assembly
What kind of gear is this?
Straight cut spur gear
Spiral Cut Bevel Gear
Helical cut gear
Planetary cut gear
What kind of gear is this?
Internal gear
Helical cut gear
Bevel cut gear
Planetary cut gear
What does an axial load bearing do?
Rotating body relates to linear movement along/parallel to axis of rotation- thrust loading
What does a radial load bearing do?
Acts at right angles to the bearings axis of rotation
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