Airframe 5

What causes the aircraft to turn around the vertical axis?. Ailerons. Rudder. Elevators.

What are the factors that affect lateral stability?. Wing sweep and dihedra. Wing loading only. Engine power.

What is used to give an aircraft longitudinal stability?. Vertical stabilizer. Horizontal stabilizer / CG vs CP. Flaps.

What does a Warren truss fuselage look like?. Welded steel tubes forming triangles. Vertical members reinforced with wire. Monocoque skin only.

What does a Pratt truss fuselage look like?. Welded steel tubes. Vertical members between longerons reinforced with wire bracing. Monocoque skin.

What do monocoque fuselages use for strength?. Internal truss. The skin of the fuselage. Wire bracing.

What does a semi-monocoque fuselage have?. Longerons. Only skin. Internal truss.

What is the purpose of fairings and fillets?. Decorative. Reduce interference drag. Strengthen the fuselage.

What carries the primary loads in a monocoque fuselage?. Longerons. Skin (superstructure). Bulkheads.

What must control locks have?. Color coding. Remove-before-flight sign. Lubrication.

How many degrees can a fairlead change cable direction?. 3°. 5°. 10°.

When control cables are pre-loaded for testing, how much tension is applied and for how long?. 60% for 3 minutes. 80% for 5 minutes. 50% for 2 minutes.

What kind of G-forces are experienced when the control column is moved forward?. Positive G. Negative G. Zero G.

What is the maximum allowable amount of free play from the trailing edge allowed in a trim tab?. 10%. 35%. 50%.

The maximum rated strength of a swaged cable is what percentage?. 90%. 100%. 75%.

If the elevator moves up, which direction does the tail of the aircraft move?. Up. Down. Neutral.

What are the limits for worn cables?. 10–20%. 40–50% of the outside wires. 60–70.

When rigging the rudder and the rudder pedals, where should the rudders align?. Neutral position. Full left. Full right.

When the control yoke is pushed forward, what happens to the elevator?. Moves up. Moves down. Remains neutral.

When the control yoke is pushed forward, what forces are felt in the aircraft cabin?. Positive Gs. Negative Gs. No Gs.

With what amount of deflection of aircraft control cables are pulleys used?. Less than 1°. More than 3°. Any amount.

What would be the result of over-tensioned control cables?. Worn pulleys and hard movement. Loose cables. No effect.

When should a control cable be replaced?. Corrosion or over 40–50% of wire wear. After 100 flight hours. Every 5 years.

Why are farleads made of Micarta? A) Reduce friction and resist wear B) Decorative only C) To strengthen cables Answer: A. Reduce friction and resist wea. Decorative only. To strengthen cables.

How much load should a swaged cable end be able to withstand?. 90% of cable strength. 100% of cable strength. 75% of cable strength.

How much load should a wrap solder cable end be able to withstand?. 90% of cable strength. 100%. 80%.

What is meant by a five-tuck cable splice? A) Woven splice with 75% of cable strength B) Woven splice with 50% strength C) Overlapped splice with 80% strength Answer: A. Woven splice with 75% of cable strength. Woven splice with 50% strength. Overlapped splice with 80% strength.

What is flutter and how is it corrected? A) Vibration of control surfaces, corrected by control surface balance B) Engine vibration, corrected by reducing RPM C) Propeller vibration, corrected by blade replacement Answer: A. Vibration of control surfaces, corrected by control surface balance. Engine vibration, corrected by reducing RPM. Propeller vibration, corrected by blade replacement.

If an aircraft propeller turns clockwise when viewed from the pilot's seat, which way will the aircraft tend to roll? A) Right B) Left (counterclockwise) C) Neutral Answer: B. Right. Left (counterclockwise). Neutral.