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 auxiliary power and {TAIL ~ 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 auxiliary power and { TAIL ~ 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 OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH