Additionally, the present invention affords several simplifications in aircraft apparatus in comparison with that required when two separate units are employed to provide {HEAD ~ the functions} of supplying {TAIL ~ auxiliary power} and emergency power to the aircraft 
of supplying
Additionally , the present invention affords several simplifications in aircraft apparatus in comparison with that required when two separate units are employed to provide { HEAD ~ the functions } of supplying { TAIL ~ auxiliary power } and emergency power to the aircraft
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH