Aging aircraft: too old to fly?

The problem of metal fatigue of aircraft is discussed in the context of risk analysis and assessment. The steps taken by aircraft designers to minimize risk are examined. A major defect of fatigue testing, which is its failure to take into account the effects of corrosion on fatigue cracks, is addressed. The pursuit of more effective methods of nondestructive testing is noted. The role played by fatigue and corrosion in the Aloha Airlines accident of April 28, 1988, in which a flight attendant was lost when a 5.5 meter-long portion of the front fuselage of a Boeing 737 ripped off during flight, is cited throughout, and Boeing´s approach to the problem is questioned.<>