Uplinker
For the B737 ATR clutch pack, the underlying problem was occasions where the clutch pack would only pick up a single throttle. The AD issue that altered the ATR computers was to ensure that alert messages and faults would be properly annunciated. The 737 Classic ATR is pretty basic in function, as was the B747 classic etc. It is driving the throttle, which then schedules the engine, so any clutch problem where a level is left behind will end up with an asymmetry.