{HEAD ~ The error signal} from summer 82 affects {TAIL ~ the constant speed drive} 66 of each channel in an identical manner 
affects
{ HEAD ~ The error signal } from summer 82 affects { TAIL ~ the constant speed drive } 66 of each channel in an identical manner
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH