PPRuNe Forums - View Single Post - Fin & Rudder strength: facts about what is NOT tested
Old 20th Nov 2002, 14:21
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Lu Zuckerman

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Question Sorry for the confusion

To: arcniz

SCAS systems in general are extremely fast reacting. The point I was trying to make is that SCAS systems or any other electronic control and monitoring systems are only as effective as the imbedded control laws. If the writers of those control laws did not foresee the problems that must be countered in event of the penetration of a highly unstable air mass then the SCAS or other systems are either blind to the condition or they are ineffective in countering the conditions. I was not implying that this type of system was installed on the A-300

A SCAS system (generally) monitors external conditions (air data computer) and various acceleration devices (autopilot) and electronic control inputs (LVDT or RVDT) and limits the control inputs by the pilot at the control servo to minimize the stresses on the airframe during maneuvering.

Speaking of monitoring systems installed on aircraft, the DC-10 was originally equipped with a system that monitored all of the systems on the aircraft in order to locate potential problems in the systems being monitored. This information was downloaded via a radio connection to the maintenance facility at the turnaround site. The system had many problems and was removed from the aircraft and not installed on new build aircraft.

Most US military helicopters now or will soon be equipped with HUMS (Health and Usage Monitoring System) that do the same as the DC-10 system but without the radio down link. With HUMS the readouts are down loaded to a computer for monitoring and detection of problems.
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