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TH-57 Systems Quiz CH5
All Questions From Chapter 5 TH-57 Systems Workbook
34
Aviation
Graduate
03/23/2013

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Term
The main rotor is a _____, _____type rotor system.
Definition
Semirigid…flapping
Term
The _______ _______ provides the mounting point for the yoke assembly.
Definition
Splined trunnion
Term
State the component that provides the flapping axis for the main rotor.
Definition
Splined trunnion
Term
T/F: Underslinging keeps the main rotor system aerodynamically balanced during flapping or tilting of the rotor system.
Definition
True
Term
How much preconing is built into the yoke?
Definition
23°
Term
Preconing _____ _____ _____ of the yoke, blade grips, and the root end of the rotor blade.
Definition
Relieves bending stress
Term
Identify the component that absorbs centrifugal forces and will twist to allow for pitch change action.
Definition
Tension torsion strap
Term
The predominant metal used in the main rotor blades is __________.
Definition
Aluminum alloy
Term
T/F: The vertical through bolt that secures the main rotor blade is hollow.
Definition
True
Term
T/F: Weights are added at the tip and midspan of each main blade for auto-rotational flight.
Definition
True
Term
Each main rotor blade weighs approximately _______ pounds.
Definition
94
Term
Main rotor blade chord length is ______.
Definition
13 inches
Term
The main rotor system utilizes a _____ _____ _____ to prevent excessive flapping.
Definition
Flap restraint kit
Term
The flap restraint kit is a _____ and _____ _____ assembly.
Definition
Flyweight…spring type
Term
In powered flight, the fuselage attempts to rotate _____.
Definition
Clockwise
Term
The effects of main rotor torque are offset by the _____ _____.
Definition
Tail rotor
Term
T/F: The tail rotor system, like the main rotor system, is a semirigid, flapping type system.
Definition
True
Term
How is tail rotor blade strength increased?
Definition
Stainless steel doublers
Term
Spanwise balance of the tail rotor blades is accomplished with ____________ on the blade bolts.
Definition
Washers
Term
T/F: Chordwise balance of the tail rotor blades is accomplished with weights and washers on the trunnion bearing housing retaining bolts.
Definition
True
Term
Pitch angles of the tail rotor blades are changed with the _____________ ______ via the pitch change links.
Definition
Pitch change horn
Term
Dynamic balancing of the tail rotor system is accomplished using the _____ _____.
Definition
Balance wheel
Term
Tail rotor flapping is limited by the _____ _____.
Definition
Static stop
Term
T/F: Like the main rotor, the tail rotor achieves underslinging with pillow blocks.
Definition
False
Term
The TH-57 flight control system is a _____ system.
Definition
Conventional
Term
Name the three flight control systems.
Definition
Cyclic…Collective…Anti-torque pedals
Term
The main rotor disc tilts with a _____ control input.
Definition
Cyclic
Term
T/F: Manual inputs to the cyclic system are pneumatically boosted.
Definition
False
Term
Cyclic inputs are transmitted via the _____ to the rotating controls.
Definition
Stationary switchplate
Term
Name the component that allows the stationary swashplate to tilt in any direction.
Definition
Uni-ball
Term
Blade pitch angle is increased or decreased equally with a collective input.
Definition
True
Term
Tail rotor blade pitch decreases with ______ pedal input.
Definition
Righ
Term
T/F: The TH-57C rotor brake assembly receives 600 psi hydraulic fluid from the aircraft hydraulic system.
Definition
False
Term
The direct reading type gauge associated with the rotor brake is located
Definition
overhead between the pilots.
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