From: firstname.lastname@example.org (Al McFarland) Organization: The MITRE Corporation Date: 18 Aug 96 20:13:39
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Anyone here familiar with the behavior of the Mach hold channel of the autopilots on in-service air transports? I presume the crew set the target Mach speed and then the Mach hold channel maintains Mach number within a certain tolerance above or below this target. Are the operators able to adjust the tolerance bands? Is there a dead band within which no power adjustments are made? What kind of control law is used in that channel? For normal cruise practice, how much excursion in Mach number is experienced around the target Mach number? Assuming that the excursions are periodic with an interval of time above the target and an interval below, what would typical periods be? Anyone know of accessible references that would address these questions?