More particularly, the present invention relates to {HEAD ~ an integrated power unit} which combines {TAIL ~ the functions} of an auxiliary power unit and of an emergency power unit into a single unit 
More particularly , the present invention relates to { HEAD ~ an integrated power unit } which combines { TAIL ~ the functions } of an auxiliary power unit and of an emergency power unit into a single unit
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH