Accident investigation results from the US Air Boeing 737 ac

Accident investigation results from the US Air Boeing 737 accident at Pittsburg, PA: a similar accident at Colorado Springs, CO, and several near-upsets involving Boeing 737\'s have suggested that the cause may be a sudden, un-commanded, full deflection of the rudder which causes the aircraft to become uncontrollable. Suggested remedies have included: 1). Redesign of the rudder to a two panel configuration so that full deflection of either panel could not provide enough control input to cause the aircraft to go out of control. 2). Redesign of the rudder Power Control Unit to preclude full-scale rudder deflection at certain critical airspeed and flap configurations. 3). Modification of the Operators (Pilot\'s) Flight Manual to avoid changing configuration or operating in certain critical airspeed regimes.
a.) Which of these suggestions would be the easiest to implement given the maturity of the Boeing 737 as a system?
b.) What issues might limit the effectiveness/desirability of this approach as a total solution?

Solution

A. Redesign of the rudder Power Control Unit to preclude full-scale rudder deflection at certain critical airspeed and flap configurations is the easiest to implement given the maturity of the Boeing 737 as a system.

B.The regulatory strategy of imposing limitations on the polluting characteristics of products is affected by the same issues noted above that make it difficult to regulate emissions in a cost-effective manner. For example, the cost to individual refineries of meeting a sulfur limit in gasoline is likely to vary significantly. It would be more efficient to allow trading among sources to meet pollution reduction obligations than to apply uniform standards to each source.