stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Rotary Wing T2 Flashcards | StudBud
Explore
/
Rotary Wing T2
Rotary Wing T2
69 terms
·
StudBud Administration
·
4 plays
Imported from external platform
Flashcards
69 cards
F
Practice quiz
P
Host live
L
Questions
69
Answers
1
The Hughes 500C and D are similar, one main difference is the 500D is a 4 bladed system, where the C is a 5 blade.
False
True
2
Where is the most common location to mount a LATERAL vibration sensor?
Upper portion of main tranny, where swashplate guide base is mounted
At the lower point of the rotating main rotor mast
Inside the cabin attached to the floor structure
On the side of the main rotor hub
3
A helicopter main rotor is capable of producing vibration in both the ____ planes
45/90 degree
Vertical/Lateral
Rotary/Fixed
Geometric
4
BELL 206: What is the main structural member of the head assembly?
Yoke
Hub
Mast
Trunnion
5
HUGHES 500C: At flight RPM, the ______ raises the striker plate off the roller
Striker pin
Strap spring
Strap pack
Coning angle
6
BELL 412: This rotor head is referred to as a _______
Hard in plane rotor
Out of plane rotor
Soft in plane rotor
Semi-articulating head
7
How did Sikorsky simplify the construction of the S76 rotor head?
The use of elastomeric bearings
The use of composite load beams
The use of a flexible fiberglass star
The use of a stainless steel strap pack
8
S-58: What controls the rate of lead-lag of the rotor blades?
Dampeners
Collective/Cyclic inputs
Rotor RPM
Lead-Lag hinges
9
BELL 206: What is #2?
Pitch horn
Pitch horn trunnion
Lead/Lag hinge
Flap restraint
10
The Hughes 500D replaced the mechanical dampeners found in the 500C with elastomeric type dampeners.
True
False
11
What are the most common types of vibration sensors available for use today?
None of the above
Accelerometer/Velometer
Magnetic pickups
Interrupters
12
Fully articulating heads have always given a smoother operation.
True
False
13
When performing main rotor track which adjustment is primarily used for in flight blade track corrections?
Collective friction adjustments
Adjustment of tracking tabs
Main rotor pitch links (PCL) adjustments
Autorotation RPM adjustments
14
The first method to accomplish rotor track and balance was limited to the use of ______
Tracking towers
Chadwick helmuth electronic balancer
Strobe lights
Static balance equipment and tracking flags
15
BELL 206: What is the pre-cone angle?
2*
12.5*
2.5*
3*
16
What is the most common cause of a main rotor vertical vibration?
Bearing wear
Landing gear damage
Unequal lift produced by the main rotor blades
Engine damage
17
AStar 350: How are vibrations dampened on this rotor head?
Hydraulic dampeners similar to H500C
Mechanic dampeners similar to H500D
Similar to the bifilar system of S76
Electronic vibration dampening system
18
One manufacturer has a new head of fiberglass that presently does NOT have a replacement life.
False
True
19
After major repair or O/H is performed on main rotor components, what should be carried out?
Flapping hinge alignment
Return main rotor system adjustments to nominal prior
Nothing
Visual inspection
20
HUGHES 500C: Each strap assembly is made of ______ and ______?
Stainless steel and teflon impregnated cloth
Stainless and graphite covered cloth
Titanium and Teflon impregnated cloth
Titanium and graphite covered cloth
21
Blade alignment is necessary on ____ Rotors
Fully Articulating
All
Semi Rigid
Rigid
22
BELL 412: The two basic parts of the rotor head are:
Yoke and Hub
Flexbeams and hub
Spindle and Mast
Stabilizer bar and Cross
23
What type of rotor system is installed on the BO 105?
Semi-Rigid
Fully Articulated
Articulated
Rigid
24
What ultimately is the desired result of the rotor track and balance job?
Should be the smoothest possible ride
Satisfied pilots, flight crew and customers
To reduce the helicopters fuel consumption
All of the above
25
BELL 47: The basic member of the head is the ______
Hub
Blade grips
Blades
Yoke
26
The drag brace on a main rotor is adjustable in order to
Balance a fully articulated rotor in a chord wise direction
Balance a semi rigid main rotor in a span wise direction
It is not adjustable
Balance the main rotor in chord wise direction
27
What type of rotor system is installed on the Hughes 500C helicopter?
Fully Articulating
Rigid
Semi-Rigid
Fiberglass
28
HUGHES 500C: The strap pack replaces the flapping and feathering hinges found on other fully articulating heads.
False
True
29
What kind of vibration would an out of track helicopter main rotor normally cause?
Low freq vertical
High freq Vertical
High freq lateral
Low freq lateral
30
Bell 206: The TT strap is made of fine wire wrapped around two spools thousands of times.
False
True
31
S-58: Which provides the feathering action of the blade?
Flexible rotor blades
Flapping hinge
Sleeve spindle assembly
None of the above
32
BO 105: Due to the blade construction, they lead-lag and flap independently.
False
True
33
HUGHES 500C: The pitch bearing, as well as the lead-lag bearings utilize what material?
Graphite
Bronze/Copper
Teflon
Rubber
34
BO 105: What type of rotor head is this?
Rigid
Fully-articulating
Semi-Rigid
35
S-58: The flapping and drooping action is limited by ________ attached to the lead/lag hinges
Flap and droop stops
Pitch links
Hydraulic dampeners
A flap restraint system
36
HUGHES 500C: What UNIQUE feature is responsible for the rotor heads lightweight and simplicity?
The driveshaft is constructed using lightweight composite materials
The use of composite rotor blades
The use of a "strap pack" mounted between the hub and lower shoe
The stationary mast is constructed using lightweight composite materials
37
AStar 350: This head behaves like an articulated head, but without the usual articulating mechanisms.
False
True
38
S-76: Construction of this rotor head system has simplified considerably by the use of _______
Elastomeric bearings
Electronic vibration analysis
Anti-friction bearings
Hydraulic pitch actuation
39
S-76: What is the following statement describing?
Dynamically oscillating vibration dampener
Bifilar vibration absorber
Elastomeric type dampener
40
S-76: Lead-lag hinges and flapping hinges have been eliminated
False
True
41
Although the BO 105 rotor head is rigid, it is still a fully articulating interaction.
False
True
42
HUGHES 500C: Another unique feature is the use of a vibration dampener, which is a __________
Hydraulic dampener
Two-part pendulum
Conical elastomeric bearing
Spherical elastomeric bearing
43
The most critical tool to the success of main rotor track and balance job is reliable ______
Strobe light
Vibration analysis equipment
Experienced pilots
Static balancers
44
AStar 350: This rotor head is made of _______
Carbon Fiber
Aluminum alloy
Titanium
Fiberglass
45
Rotor heads are USUALLY made of _______
Steel and aluminum alloy
Titanium
Carbon fiber
Fiberglass
46
BELL 206: Was designed as a dry head, although many have been converted to wet heads.
False
True
47
What is the most common cause of a main rotor lateral vibration?
An unequal distribution of mass in the main rotor disk
Loose cyclic
Increase of decrease pitch on one blade
Unequal weight distribution in the cabin
48
What is the most probable cause of vibration in a helicopter?
Main rotor, tail rotor out of track or balance
Engine
Tail boom
Landing gear
49
BELL 47: The purpose of the counterweight is ______
To ease movement of the feathering axis
Ensure pitch angle is the same between both blades
To prevent fore and aft movement of the blade
Retain the blade and support the drag brace
50
S-76: How is the lead-lag and flapping movement accomplished?
Elastomeric bearings
See-Saw action
Flexible rotor blades
Trunnion bearings
51
Even if a component is statically balanced, it does not mean that the component will be dynamically balanced.
True
False
52
When should a rotor track and balance be performed?
Most aircraft have specified intervals
After a component of the system has been changed
All of the above
After the pilot reports a marked change in the vibration of A/C
53
Allowing the blades to lead/lag independently allows for equalization of lift between advance/retreat blades (Fully-Art)
True
False
54
S-76: What system is in use to reduce vibration levels and stresses placed on the helicopter?
Bifilar vibration absorber
Elastomeric bearings
Mechanic dampeners
Electronic vibration analysis
55
AStar 350: What is NOT an advantage of this rotor head?
Less mechanical complexities
Lower weight
Does not have a finite life
Is extremely maneuverable
56
HUGHES 500C: What is a feature of the Hughes 500 rotor head system?
The mast is constructed of lightweight, composite material
The mast is stationary and the driveshaft runs through the center
The rotor head is made from titanium
It has a rigid rotor head system
57
Which component is the structural member of the Bell 206 rotor head?
Main Trunnion
Pillow block
Tension Torsion strap
Yoke
58
Where is the most common place to mount the VERTICAL vibration sensor?
Upper portion of the main tranny, where swashplate guide is mounted
To the mast support structure
As far forward in the cabin as possible
On the strobex portion of the electronic balancer
59
BELL 206: What is the purpose of the flap restraint?
To allow for flapping motion of the blades
To correct for dissymmetry of lift
To limit droop when the helicopter is shut down
To limit flapping action at low rotor RPM
60
BO 105: The head is constructed of:
Carbon Fiber
Aluminum alloy
Fiberglass
Titanium
61
BELL 47: The drag brace is used to prevent fore and aft movement of the blade
True
False
62
AStar 350: Elastomeric spherical thrust bearings allow pitch, flapping, and lead-lag movements
True
False
63
What provides the flapping action on a Bell 412 rotor head?
Yoke spindles
Elastomeric bearings
Hub
Yokes
64
Servicing a main rotor head normally consists of
Cleaning
Lubrication
Rotor heads do not require servicing
Inspection
65
BELL 206: Oil reservoir and sight glass is attached to the pitch horn
False
True
66
BELL 412: All movements of the head are possible through the use of flex beams and elastomers.
False
True
67
BELL 206: Where do you add weight to correct SPANWISE balance?
Blade root
Blade bolts
Blade tips
Adding weight will not correct spanwise balance
68
What is used to equalize the lift forces of the advancing/retreating blades in a SEMI-RIGID system?
Gimbal
Pillow block trunnion
Lead/Lag hinges
Independent flapping hinges
69
Rotor heads can also be classified as:
Lubricated/Non lubricated
Wet/Dry
None of the above are correct
Greased/Oiled
