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