12.70.6(a) . aluminium; 

Structural integrity
– this provides a significant portion of the structural strength of the aircraft
– designed to be fail-safe

Indicated damage
– designed and constructed in such a way that overstressing will result in gradual failure of a part of a structure and not a sudden and catastrophic failure of the whole thing
– indications of potential danage are: cracks in the skin, popped, loose or missing rivets, ontoward movement between airframe components, Also unusual buckling of the skin, or distortion or twisting of componenets of the airframe

12.70.6. Describe the precautions required to preserve the structural integrity of thefollowing airframes: 

12.70.4(b) . in the air, and state the function of spars and struts in opposing these loads. 

12.70.4(a) . on the ground; 

12.70.4. Explain the components and distribution of the load on a wing:

12.70.2. Identify and explain the basic function of the major components of a conventionalairframe. 

12.68. Stalling and Spinning

12.68.18. Explain the standard recovery action from a developed spin.Structure and Systems 

Check the throttle is closed and the flaps up
Apply full opposite rudder to the direction of the spin
Leave a pause to let the effect reduce the yaw
Ease control column centrally forward to reduce angle of attack
Centralize the rudder as soon as the spin stops
Level out the wings and ease out of the end=suing dive

12.68.16. State what actions can be taken to avoid a spin.

Not yawing an aircraft that is stalled or on the point of stalling

12.68.14(d) . the difference between a spin and a spiral dive. 

A spiral dive is a steep turn that has gone wrong
Nose altitude is low and the wings are not stalled
Airspeed is rapidly increasing
Rate of descent is high

In a spin the aircraft is stalled, rolling yawing and pitching
Rapidly loses altitude at a relatively low airspeed