Term
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Definition
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Term
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Definition
| Standard Practices – Propeller / Rotor |
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Definition
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Definition
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Definition
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Definition
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Definition
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Definition
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Definition
| Airworthiness Limitations Schedule |
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Term
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Definition
| Inspections and Component Overhaul Schedule |
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Term
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Definition
| Vibration and Noise Analysis |
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Term
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Definition
-Maintenance
-Parts (IPC)
-Component |
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Term
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Definition
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Term
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Definition
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Term
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Definition
-Main rotor hub assembly
-Main rotor blades
-Fuselage
-Pylon
-Stabilizer
-Tail boom
-Tail rotor
-Tail skid
-Powerplant
-Airframe
-Transmission
-Landing gear or skid |
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Term
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Definition
-Symmetrical
-Asymmetrical |
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Term
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Definition
-Primary
-Stationary center of pressure |
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Term
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Definition
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Term
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Definition
-Visual
-Tap
-Magnifying glass
--for--
-Erosion
-Debond |
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Term
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Definition
-Fully Articulated
-Semi-Rigid
-Rigid |
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Term
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Definition
3 or more blades
-Flap
-Feather
-Drag |
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Term
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Definition
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Term
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Definition
any number of blades
-Feather |
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Term
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Definition
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Term
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Definition
-Pitch
-rotation along longitudinal axis of blade |
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Term
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Definition
-Lead or Lag
(Foward and aft) |
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Term
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Definition
-Taper roller
-Roller
-Ball
-Plain
-Needle
-Spherical
-Elastomeric |
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Term
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Definition
Do not mix types
-Pack
-Gun
-Spray |
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Term
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Definition
-Time interval
-Damage
-Vibration |
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Term
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Definition
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Term
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Definition
-Left side of seat
-Controls altitude
-Changes all blade angles the same ammount
-Throttle on grip |
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Term
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Definition
-located on collective pitch control
-Manually or synchronized with blade pitch
--increase pitch = increase power
--decrease pitch = decrease power |
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Term
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Definition
-Front center of pilot
-Changes pitch of the blades at a certain point in the revolution
-Controls _longitudinal & lateral axis (roll and pitch) |
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Term
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Definition
-Foot pedals
-Changes pitch of tail rotor
--maintain heading
--Controls yaw |
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Term
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Definition
-Primarily fully-articulated hub – (lead/lag)
-An unbalance in centrifugal forces
-Reduced by using dampers on blades and gear |
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Term
| Mount types for Recip engines |
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Definition
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Term
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Definition
| -Provides gear reduction to rotors |
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Term
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Definition
-Engages rotor after engine start
-Manual or Automatic |
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Term
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Definition
-Prevents engine drag on rotor
-Not required on a free-wheeling turbine |
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Term
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Definition
-When the engine is disconnected from the transmission (free wheeling)
-Air direction is up through the rotor to cause lift |
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Term
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Definition
-The physical movement or motion of dynamic components
-Oscillation in mechanical system |
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Term
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Definition
-Extends the longevity of parts
-Increases the safety of helicopter |
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Term
| Components that produce vibration |
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Definition
-Engine
-Propeller
-Rotor
-Airframe |
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Term
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Definition
-Imbalance
-Mechanical looseness
-Misalignment
-Gears
-Bearings |
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Term
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Definition
-Static (stationary)
-Dynamic |
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Term
| What is angular misalignment |
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Definition
| Part actually bends and is no longer straight |
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Term
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Definition
-Sound
-Feel
-Velometer / Accelerometer (Vibration pickups) |
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Term
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Definition
-Frequency
-Mode (direction)
--Ground
--Hover
--Forward flight
-Condition |
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Term
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Definition
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Term
| Low freq vibration (beat) |
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Definition
Usually from the main rotor
-Out of balance blades
-Out of track blades |
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Term
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Definition
-Tail rotor
-Loose components or absorbers |
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Term
| High freq vibration (buzz) |
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Definition
-Transmission
-Tail rotor drive
-Turbine engine |
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Term
| Modes of vibration (and where are sensors mounted) |
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Definition
-Vertical (up and down)
--as far forward as possible in a vertical position
-Lateral (sideways)
--2 sensors, each side of fuselage in a vertical position |
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Term
| Methods of blade tracking |
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Definition
-Strobe
-Flag (old do not do) |
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Term
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Definition
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Term
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Definition
Stroboscope
-Check at 100% RPM on ground
-Check in hover
-Check in flight |
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Term
| How do you correct ground and hover out-of-track? |
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Definition
| -Adjust pitch change links |
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Term
| How do you correct flight out-of-track? |
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Definition
-Adjust trim tabs
--use proper tool
--small adjustment |
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Term
| What is dissymmetry of lift? |
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Definition
| When one side of rotating blade produces more lift then the other because of wind or directional flight. |
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Term
| Non-standard flight platforms |
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Definition
-Tilt Rotor
-X-wing
-Autogiro |
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Term
| What do you adjust for vertical corrections? |
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Definition
-Pitch change links
-Trim tabs |
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Term
| What do you adjust for vertical corrections? |
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Definition
-Pitch change links
-Trim tabs |
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Term
| What happens when you adjust pitch change links? |
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Definition
-Will affect vertical and lateral vibration levels
-Change the tip path of the blades through all speeds |
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Term
| What happens when you adjust trim tabs? |
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Definition
-Affects vertical vibrations
-Changes tip path of blades at higher speeds |
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Term
| Adjustment Results of Sweep, Tip Weigh and Hub Weight |
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Definition
-changes the mass of the rotor at all air speeds
-Affect lateral vibration levels |
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Term
| Adjusting blade chordwise weight? |
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Definition
-Changes the tip path plane of the blades
-Have large affect on vertical and lateral vibrations at ground and hover |
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Term
| How do you adjust autorotation RPM? |
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Definition
-Adjust pitch change links equally in same direction
-adjustments have no effect on rotor track |
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Term
| When do you perform Track and Balance? |
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Definition
-Manufacturers intervals
-After system component changes
-Pilot reports |
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Term
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Definition
| Health and Usage Monitoring System |
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Term
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Definition
performs and assists in:
-Built-in tests
-Mechanical Diagnostics
-Usage monitoring
-Exceedance/Event Monitoring
-Engine vibration monitoring |
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Term
| Non-Standard flight platforms |
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Definition
-Autogiro
-Tilt-rotor
-X-Wing |
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Term
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Definition
Record Keeping
-Track life-limited parts
-Track total time in service
-Track Time since last overhaul |
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Term
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Definition
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Term
| What are the two basic gyroscopic characteristics possessed by a helicopter rotor system? |
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Definition
-Gyroscopic Procession
-Gyroscopic Rigidity |
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Term
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Definition
-NOTAR
-Conventional
-Fan (Fennestron)
-Guarded |
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Term
| WHat does IPS stand for? What is it used for? |
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Definition
-Inches Per Second
-Blade balancing |
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