Structures Surface Finishing
What is the chemical process called that applies a protective film to aluminium without using electricity?
Alodising
What type of floats are inflated only during an emergency water landing?
Pop-out floats
What is positive static stability in a helicopter?
The helicopter tries to return to its initial attitude after a disturbance.
What is the most common assembly technique used in aircraft construction?
Riveting
What is the purpose of the cyclic control system?
To tilt the rotor disc
What is the most effective means of preventing metals from being exposed to corrosive elements?
Painting
What is the purpose of baffles in fuel tanks?
To prevent fuel surging
What is the effect of a gust on a hovering helicopter?
The helicopter tilts its disc and begins to move in the direction of the gust.
What is the purpose of a torque wrench in bolting?
To set the correct tension of the installed bolt
What is the purpose of the mixer box in helicopter flight controls?
To combine pilot, cyclic, and collective inputs
What is the purpose of naphtha in helicopter cleaning?
To remove oil, grease, or soft preservative compounds
What does 'oleo-pneumatic' in shock struts refer to?
The use of oil and air to absorb landing shocks
What is the function of horizontal stabilisers in helicopters?
To provide static stability by inducing an opposite force to pitch disturbances.
What is the primary function of longerons in helicopter construction?
Carry heavy loads longitudinally
Which flight parameters are controlled by the pilot and the Automatic Flight Control System (AFCS)?
Altitude, Attitude, Direction
What should be done after washing wheel wells or flight control tracks?
Lubricate components to prevent corrosion
What is the purpose of shims in engine mounts?
To align the engine with the airframe
What happens when a helicopter exhibits negative dynamic stability?
The oscillations increase in magnitude over time.
What is the primary function of struts in helicopter construction?
Resist compression loads
What is the primary function of torque tubes in helicopter flight control systems?
To convert rotary motion to linear motion
What is the purpose of using a jig during major structural repairs?
To keep the structure in alignment
What is the purpose of a stinger on a vertical stabiliser?
To protect the tail rotor during high nose-up landings
What are the three basic causes of a helicopter’s dynamic instability?
Rotor tilt with airspeed changes, rotor disc following pendulum effect, fuselage pitching with rotor RPM changes
What is the primary function of the body structure in a helicopter fuselage?
Carry lift and thrust loads
What happens to rotor RPM when the pitch angle increases?
Rotor RPM decreases