write:Insufficient attention to APC phenomena generally seems to be associated with alack of understanding and relevant experience. This shortcoming should beaddressed through improved e

should bedesigned for linear proportional responses
and should avoid nonlinear controlsystem characteristics (that is
responses that are not proportional to input).•The maximum maneuvering rates and severe turbulence should not result inactuator rate and/or position limiting. •The system should strive to minimize the number of modes and failure statesconsistent with aircraft performance requirements.Finally
the NRC report made the following finding and recommendation
respectively: Operational line pilots have little or no exposure to APC potential and are nottrained to recognize the initial symptoms or to understand that APC does notimply poor airmanship. This may limit reporting of APC events. Insufficient attention to APC phenomena generally seems to be associated with alack of understanding and relevant experience. This shortcoming should beaddressed through improved education about APC phenomena for pilots and otherpersonnel involved in aircraft design
simulation
testing
certification
operation
and accident investigation. 1.18.8.1 Aircraft-Pilot Coupling Testing ManeuversAC 25-7
“Flight Test Guide for Certification of Transport Category Airplanes
”which was issued in April 1986
provided guidelines for flight test methods andprocedures to show compliance with the regulations contained in subpart B (airplaneperformance and handling characteristics) of 14 CFR Part 25. AC 25-7A was issued inMarch 1998 and was revised in June 1999. AC 25-7A contained APC testing guidancethat was not included in AC 25-7. AC 25-7A stated that capture (gross acquisition) tasks and fine tracking taskscould highlight APC problem areas that might exist.173 For example
AC 25-7A stated that173 AC 25-7A states that capture tasks can give the pilot a general impression of the handling qualities ofthe airplane. Various capture tasks—for pitch attitude
bank angle
heading
flightpath angle
AOA
and G—can be done to evaluate different aspects of the airplane’s response as long as the necessary cues areavailable to the pilot. AC 25-7A also states that capture tasks should not be used as the only evaluation taskbecause they would not expose all of the problems that might arise in closed-loop
fine tracking tasks.