Rotary Procedures - Midterm Prep (questions from last block - Bell 206, AS350/355, R22)
How does the AS355 transmission drive shaft assembly provide flexibility of the shaft as the tail boom deflects?
A universal joint coupling attached to the each end of the shaft
A Flector coupling where shaft segments attach to each other
A Thomas coupling where shaft segments attach to each other
A Curvic coupling assembly where each shaft segment attaches to each other
What drives the T/R driveshaft on the ES355?
The output end of the Freewheeling unit on the main rotor transmission
The output end of the Freewheeling unit on the aft side of the engine gearbox
The aft end of the output on the combining gearbox
A dedicated drive pad on the lower portion of the main rotor Transmission
How is the flapping action accomplished on the AS350/355 MRH?
Flexing of the spindle assembly inside the elastomeric retention and thrust bearings
Horizontally mounted hinge pins or bolts
Flexing of the star arm assembly
Flexing of a strap pack assembly
What type of rotor head is the Eurocopter AS350/355 MRH?
Semi-rigid main rotor head
Semi-articulated main rotor head
Fully articulated main rotor head
Rigid main rotor head
How is the lead/lag action accomplished on the AS350/355 MRH?
Vertical mounted hinge pins or bolts
Lead/lag link assembly
Flexing of the upper and lower sleeves at the spherical thrust bearing and the frequency adapter
Flexing of the spindle assembly inside the elastomeric retention and thrust bearings
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
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
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)
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 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
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 is the purpose of the 3 removable plugs on the AS355 combining gearbox?
Borescope Inspection
Gear lubrication
Installing accelerometers for vibration analysis
Gear replacement
What do the intermediate gears drive in the AS355 combining gearbox?
Oil Pumps
N1 & N2 Tachometer Generators
Hydraulic Pumps
Starter/Generators
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 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
How many suspension mount pads attach the transmission to the deck of the AS355?
1
2
3
4
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 rigid Suspension Bars support the weight of the helicopter and secure the transmission to the AS355 helicopter?
2
3
4
5
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 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 many engines does the AS355 have to drive the Transmission?
1
2
3
4
On the euro copter AS 350 Astar and The AS 355 twin star, which end of the inner driveshaft has a flexible coupling assembly to accommodate for deflection of the transmission?
A universal joint or a gimbal attached between the transmission and the coupling housing
A universal joint or gimbal attached between the engine and the coupling housing
Because it is a fully articulated rotor head, there is no movement to deal with on this transmission
A universal joint or gimbal at each end of the coupling housing
On the Eurocopter AS 350 Astar & AS 355 Twinstar, what provides the flexible coupling on the internal driveshaft between the engine and main rotor transmission?
Spring Steel Plates at each end of the shaft
A Spherical Coupling gear riding on the splines inside the outer coupling at each end
A universal joint and gimbal assembly at each end of the shaft
Flexible stainless steel plates between the two splined flanges
On the Eurocopter AS 350 Astar & AS 355 Twinstar, which end of the inner drive shaft has a flexible coupling assembly to accommodate for deflections of the transmission?
The engine end has the flexible coupling
Both ends require a flexible coupling
Neither end requires a flexible coupling
The transmission end has the flexible coupling
On the Eurocopter AS 350 Astar & AS 355 Twinstar, how does the driveshaft assembly correct for movement of the transmission?
A universal joint or gimbal attached between the engine and the coupling housing
A universal joint or gimbal attached between the transmission and the coupling housing
A universal joint or gimbal at each end of the coupling housing
Because it is a fully articulated rotor head, there is no movement to deal with on this transmission
What is the meaning of the term "Wet Head" on the Bell 206 MRH?
The MRH is lubricated by hydraulic fluid using the airframe hydraulic system
The MRH is lubricated by oil using the main rotor gearbox oil system
The MRH is lubricated by oil using self-contain oil reservoirs
The MRH is lubricated by grease using various grease fittings
What type of main rotor head is installed on the Bell 206 Helicopter?
Rigid main rotor head
Semi-rigid main rotor head
Semi-articulated main rotor head
Fully articulated main rotor head
What is the purpose of the latch assemblies on the Bell 206 MRH?
It is the lead/lag hinge
Allows blade sweeping for balance
Holds the blade in the head
Secures the grip to the yoke assembly
What is the meaning of the term "Dry Head" on the Bell 206 MRH?
The MRH is lubricated by oil using self-contain oil reservoirs
The MRH is not lubricated, as there are no moving parts
The MRH is Teflon lined and requires no lubrication
The MRH is lubricated by grease using various grease fittings
What is the purpose of the tension torsion strap in the Bell 206 MRH?
It is the lead/lag hinge
Transfers the centrifugal force from the grip to the head
Secures the grip to the yoke assembly
All of the above
How does the Bell 206 transmission drive shaft assembly provide flexibility of the shaft as the tail boom deflects?
A universal joint coupling attached to the each end of the shaft
A splined end on the shaft where it attaches to both ends
A Curvic coupling assembly where each shaft segment attaches to each other
A Thomas coupling where shaft segments attach to each other
What is the type of gearing inside the Bell 206 T/R gearbox and what does it do?
Single stage planetary gears used to reduce the rpm and change the plane of rotation 90 degrees
Single stage helical bevel gears used to increase the rpm and change the plane of rotation 180 degrees
Single stage helical bevel gears used to reduce the rpm and change the plane of rotation 90 degrees
Single stage helical bevel gears used to increase the rpm and change the plane of rotation 90 degrees
What does the pitch change mechanism, attached to the tail rotor gearbox, move to create T/R blade angle changes on the Bell 206?
A threaded sleeve and Tee head attached to the blades through adjustable pitch links
A threaded nut and Dee tube attached to the blades through adjustable pitch links
A bellcrank assembly and pitch links attached to a sliding sleeve assembly
A bellcrank assembly and sliding rod assembly attached to a Tee head and pitch links
What is the purpose of the shear pin located on the coupling flanges and splined plug inserts on the Bell 206 tail rotor drive shaft?
They are the primary fastener that prevents the flange or plug from rotating
They back-up the bonded joint on the flange or plug and shaft should the bonding fail
Their purpose is to shear if the tail rotor strikes something during operation
There are no pins installed on these coupling flanges and splined plugs they are all installed with solid rivets
What supports the center section of tail rotor driveshaft on the Bell 206?
Drive shaft dampers
A support tube with two bearings pressed inside
It has no supports the shaft spins freely
Several hanger bearing assemblies attached to the tail boom
When using the beveled washers with the flexible plates on the Bell 206 driveshaft, which way do the bevels face and why?
Towards the head to prevent damage from the sharp edge of the washer on the head of the bolt
Towards the stainless steel plate to prevent damage from the sharp edge of the washer on the head of the bolt
Towards the stainless steel plate to prevent damage from the sharp edge of the washer on the plate
It doesn't matter which way the washer is installed, all washers are beveled on one side
What is the purpose of indexing the Bell 206 flexible stainless steel plates on the driveshaft with flats spots on the opposite sides (180 degrees apart) of the circumference of round plate?
To reduce the weight of the plates
To identify and offset the grain patterns at 90 degrees for maximum flexibility during assembly
To identify and line up the grain patterns in the same direction for maximum flexibility
There are no indexing flats on the flexible plates
What is the purpose of the short shaft segment just between the forward and aft short shaft assemblies on the Bell 206 T/R drive system?
Drive the air conditioning compressor
Drive the oil pump for the main rotor transmission
Drive the engine oil pump
Drive the fan for the engine oil cooler
What drives the T/R driveshaft on the Bell 206?
The output end of the Freewheeling unit on the main rotor transmission
The output end of the Freewheeling unit on the aft side of the engine gearbox
The output end of the Freewheeling unit on the combining gearbox
A dedicated drive pad on the lower portion of the main rotor Transmission
Which of the following gears inside the Bell 206 Transmission does not rotate?
Planetary Gear
Pinion Gear
Sun Gear
Ring Gear
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
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
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
Where does the oil come from to lubricate the freewheeling unit on the Bell 206?
The engine oil system
A self-contained oil system within the freewheeling unit
The transmission oil system
The freewheeling unit does not require any oil
What does Bell Helicopters call out for to lubricate the Original Bell 206 Main Rotor Transmission Drive Shaft Couplings?
Bell Special Purpose Grease
Engine Oil
Transmission Oil
Teflon Coating
How does the Kaman K-Flex drive shaft modification eliminate the problem that caused Bell 206 driveshaft failure accident discussed?
Uses a much better and longer lasting
Uses oil to lubricate the couplings
The couplings are Teflon coated
The couplings use flexible metal straps no lubrication required
What is the purpose of the flexible couplings at each end of the Bell 206 Main Rotor Transmission Drive Shaft?
Allow for momentary misalignment of the shaft caused by movement of the transmission
Allow for momentary misalignment of the shaft caused by movement of the engine
To allow for ease of installation of the driveshaft
How is flexibility obtained on the Bell 206 Main Rotor Transmission Drive Shaft?
Spring Steel Plates at each end of the shaft
A Spherical Coupling gear riding on the splines inside the outer coupling at each end
A universal joint and gimbal assembly at each end of the shaft
Flexible stainless steel plates at each end of the shaft
What type of metal does the chip detector in the Bell 206 freewheeling unit pick up?
Aluminum
Non-ferrous
Ferrous
Non-magnetic
Where does the oil com from to lubricate the freewheeling unit on the bell 206?
The engine oil system
A self-contained oil system within the freewheeling unit
The transmission oil system
The freewheeling unit does not require any oil
What is the acronym used to describe the speed of the main rotor in the Bell 206 helicopter
Sr
N1
Nr
N3
What is the positioning and interconnect of the engine and transmission on the Robinson R22 helicopter disused?
The engine is mounted on an angle in the nose of the aircraft and inked to the transmission located behind and above the pilots with a shaft running from the engine to the transmission between the pilots
The engine is mounted vertically with the transmission attached directly to and driven by the output end of the engine
The engine is mounted horizontally below the transmission and linked to the transmission drive using drive belts
The engine is mounted vertically beside the transmission and linked to the transmission drive using drive belts
On the Robinson R22, how are the belt tensions increased?
With a centrifugal clutch that increases the belt tension as the engine speeds up
With an idler pulley pushing against the belts to increase the belt tension acting on all three pulleys
The R22 is direct drive not belt drive
A clutch actuator that will increase distance between two pulleys or sheaves
How many stages of gear reduction are inside the transmission of the Robinson R22?
0
1
2
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
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
What is the purpose of the latch bolt assembly on the Bell 206 MRH?
It secures the grip to the tension torsion strap assembly
It allows for blade flapping
It is the lead/lag hinge
Holds the blade in the head
What is the maximum amount of twist allowed for the tension torsion strap Bell 206 on the Main Rotor Head?
10 degrees
45 degrees
90 degrees
180 degrees
How is Pitch change achieved on the AS350/355 MRH?
Metal Spindle and pitch horn assembly rotating inside multiple elastomeric bearings mounted to a fixed hub
Metal Spindle and pitch horn assembly rotating inside multiple elastomeric bearings mounted to a flexible strap pack assembly
Metal Spindle and pitch horn assembly rotating inside multiple ball type thrust bearings mounted to a teetering hub
Two composite sleeve assemblies with two elastomeric bearings, and a metallic pitch horn mounted to a flexible star assembly/hub
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