12.72.2(a) . blade section; 

– is an aerofoil
– has a leading edge, trailing edge, chordline and camber

12.72.2. With respect to propeller terminology, define the meaning of the following:

12.70. Airframe Structure

12.70.10. Describe the procedure to tie down (or picket) a light aircraft.

1. Park it into wind
2. Set brakes to park and chock the wheels
3. Lock the control surfaces (control column lock)
4. Tie the aircraft down

12.70.8(c) . fabric covering. 

12.70.8(b) . composite; 

12.70.8(a) . aluminium; 

12.70.8. Describe the indications of damage or failure of airframes constructed of;Sub Topic Syllabus Item 

12.70.6(c) . fabric covered. 

Structural integrity:
– lift and drag generated by the aircraft will be transmitted by the fabric through those areas where it is attached to the ribs and other parts of the airframe
– the suction force on the upper wing surface is borne by the fabric covering where it is unattached between the ribs
– at slower speed and lighter aircraft weights the lift required for flight can be generated with small pressure changes over the wings
– fabric applicationust therefore be restricted to use on relatively low never exceed speeds and low wing loadings
Indicated damage:-
– all seams and lapped joints must be inspected
– make sure surface tapes securely doped into place
– lacing cords checked for failure and tightness
– drain holes unobstructed
– no cuts, tears or other damage
– dope separation, whorls cracks and splits checked

12.70.6(b) . composite; 

Structural integrity
– behaves differently under normal loads than equivalent structures made of metal
– lighter than equivalent metal structure
– stiffer and less prone to fatigue and corrosion
– more resistant to damage from hail or small stones

Indicated damage:
– common casue of failoure is delamination
– dull areas or those with a whitish colour could indicate delamination
– slight bubble or depression
– External surface cracked or crazed
– areas of exposed fibres ie impact damage , lightning strike, areas fretted or abraded by rubbing toigether friction or subjection to high heat