This problem resulted in the breakup of three early 1950s aircraft under then

This problem resulted in the breakup of three early

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This problem resulted in the breakup of three early 1950’s aircraft under then mysterious conditions. Investigations revealed that the cause was __________ ___________, from the flexing of the structure caused by pressurization /depressurization cycles.7. Wrinkles observed during the preflight inspections in the top of the wing or the bottom of thehorizontal stabilizer and / stretch marks on the bottom of the wing or top of the stabilizer that weren’t there during the manufacturing process are good evidence of _______________ ____________, due to overstressed flight and the aircraft is no longer airworthy.8. One process to prevent aluminum alloyed metal corrosion is by _____________. This involvescovering the aluminum allow metal with pure aluminum, thin coating, rolled onto the surface.
9. T/F Pure aluminum does not corrode, it does oxidize, that is it readily unites with oxygen in the air to form a dull – looking film on its surface. This film is tight and prevents any more oxygen reaching the metal.

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