Rotor System Flashcards
What does CH-47F stand for?
Chinook Helicopter Model F
The CH-47F is a twin-engine, tandem rotor heavy-lift helicopter used by the U.S. Army.
What is the purpose of the IPC?
Instructional Product Code
The IPC is used for tracking training materials and ensuring proper instructional standards.
What must a country do to instruct international military students on the CH-47F?
- Purchase equipment through FMS. 2. Have an accepted clearance under a general security agreement with the US.
What are the components of the rotary wing head control system?
- Slider Shaft 2. Swashplate Assembly 3. Actuators 4. Fixed Links 5. Pitch Change Links.
What is the function of the Centrifugal Droop Stops?
Limits blade droop at low RPMs.
What is the evaluation method for students during the training?
Written examination requiring a GO on each scorable unit, with 90 minutes allotted.
What does the Pitch Change Link do?
Transmits blade pitch changes from the rotating ring of the swashplate to the pitch varying housing on the rotor head.
What environmental considerations must be followed?
- Comply with environmental laws. 2. Prevent pollution at the source. 3. Conserve natural resources.
What are the major components of the swashplate?
- Stationary Ring 2. Rotating Ring 3. Uniball 4. Bearing Assembly.
Fill in the blank: The _______ controls the rate and limits the amount of lead and lag for the blade assemblies.
Blade Shock Absorber
True or False: There are specific safety considerations for the CH-47F rotor systems lesson.
False
What component connects the Pitch Varying Housing to the Pitch Varying Shaft and allows for Feathering?
Tie Bar
How many separate oil lubrication tanks does each rotor head contain?
Seven
What is the proper procedure in the event of severe weather or a tornado?
Exit classroom orderly, move to designated location, and hold accountability formation.
What does a rotor blade drooping significantly lower than the others indicate?
A Missing Droop Stop
What is the function of the Blade Shock Absorber?
Absorbs shock and stabilizes the rotor blade during flight.
What is used to pull the balance arm outward as the RRPM increases from Ground to Flight?
The Weight on the balance arm
What are the operational characteristics of the rotary wing blades?
- Lift generation 2. Control of pitch 3. Stability during flight.
What is the environmental restriction regarding lightning protection?
Avoid flight in or near thunderstorms if any lightning cables or straps are missing or broken.
What are the major components of the rotor head assembly?
- Rotor Hub Assembly 2. Horizontal Hinge Pin 3. Tie Bar 4. Pitch Varying Shaft 5. Pitch Varying Housing 6. Vertical Hinge Pin 7. Lubrication System.
What is the purpose of the lubrication system in the rotor head?
To ensure smooth operation and prevent wear of mechanical components.
Fill in the blank: The _______ must be closed when temperatures are above -1 ºC.
Blade Shock Absorber Vent Valve
What is the primary flight condition to avoid if lightning cables and straps are damaged or missing from the rotor blade?
Flight near Thunderstorms
This is crucial to prevent electrical hazards during flight.
What lightning protection components on the rotor blades are checked on preflight?
Lightning cables at the root end of the blade, and the straps on top and bottom of the blade
These components are vital for the safety of rotor operations.
What is the purpose of the Kevlar filament windings on the rotor blades?
They are used to hold on the composite lag damper bracket to the blade
This ensures structural integrity and performance of the rotor.
What are the rotor speed limitations for the rotor RPM (NR)?
91% to 111%
Specific ranges indicate different operational statuses and alerts.
What does the rotor speed indication display show for 0% to below 91%?
Red digital readout
This indicates a critical low rotor speed condition.
What color is the digital readout for rotor speeds between 101% to 106%?
Yellow digital readout
This signifies a cautionary range of rotor speed.
What component provides rotor speed indications?
Permanent Magnetic Generator
This component is essential for accurate rotor speed measurement.
What should be recorded on DA Form 2408-13-1 if the rotor system accelerates above what percentage?
Above 111.5% NR
This is crucial for maintaining flight safety records.
What is the normal rotor RPM operating range?
97% to 101% NR
This range is considered safe for standard operations.
What happens to the display when rotor speed (NR) is in the normal operating range?
Blank digital readout
This indicates that the rotor speed is within normal parameters.
What is the maximum transient rotor speed during power-on?
106%
Exceeding this can lead to potential rotor damage.
What is the upper limit for rotor speed indications?
111%
This is the maximum transient limit before risking rotor failure.
What color is the digital readout for rotor speeds above 106%?
Red digital readout
Indicates a critical condition that requires immediate attention.
Fill in the blank: Lightning protection cables are bolted to the strap at the _______ and _______ of the blade.
Top and Bottom
This secures the lightning protection system effectively.
What must be avoided if lightning cables or straps are missing or broken?
Flight in or near thunderstorms
Essential for pilot and aircraft safety.
Describe the rotor speed indication colors for the range 91% to 97%.
Yellow digital readout
This indicates a cautionary status during flight.
