Originally Posted by
HundredPercentPlease
It could take years, but it may be more like the rudder hardover problem. Two fatal accidents, keep the thing flying, quite a few hairy moments, then find and fix the problem years later.
The outcome of the UAL585 and USAir 427 jammed servo/rudder reversal problem owns a great deal to one certain manager in USAir who doggedly refused to accept the conclusions being drawn on the Aliquippa event. Eventually that led to the in-depth investigation and the surprise revelation of thermal shock from hot hydraulic fluid interacting with a cold actuator. I still have an issue on the rate of roll recorded in 427's case, which is consistent with autorotation, which needs a high AOA to exist in such cases; the rudder alone did not have the secondary roll authority to achieve the rates recorded.