▁first ▁proposal ▁for ▁such ▁an ▁aircraft ▁was ▁presented ▁to ▁He inkel ▁by ▁his ▁firm ' s ▁engineering ▁staff . ▁The ▁aircraft ▁was ▁intended ▁to ▁have ▁a ▁reduced ▁crew ▁of ▁three , ▁with ▁a ▁fully ▁press ur ized ▁nose ▁compart ment ▁for ▁the ▁pilot ▁and ▁bomb ard ier / forward ▁gun ner , ▁and ▁separate ▁press ur ized ▁tail ▁gun ▁emp lacement . ▁The ▁result , ▁in ▁December ▁ 1 9 4 0 , ▁was ▁the ▁specification ▁for ▁the ▁He ▁ 1 7 7 A - 2 ▁high ▁alt itude ▁bom ber ▁design , ▁with ▁a ▁four - person ▁crew ▁( p il ot , ▁bomb ard ier , ▁forward ▁gun ner ▁and ▁tail ▁gun ner ) ▁in ▁the ▁two ▁specified ▁press ur ized ▁compart ments , ▁and ▁power ed ▁by ▁the ▁regular ▁A - series ▁pair ▁of ▁DB ▁ 6 0 6 ▁couple d ▁engines . ▁The ▁def ensive ▁arm ament ▁had ▁been ▁reduced ▁to ▁a ▁tri o ▁of ▁Fern g este u ert - L af ette ▁F L ▁ 8 1 Z ▁remote ▁gun ▁tur rets , ▁each ▁with ▁a ▁tw in - bar rel ▁M G ▁ 8 1 ▁arm ament ▁installation ▁each ▁in ▁an ▁upper ▁nose ▁mount , ▁forward ▁d ors al ▁and ▁( as ▁part ▁of ▁the ▁B ola ▁cas em ate - style ▁g ond ola ▁under ▁the ▁nose ) ▁forward ▁vent ral ▁location ▁each , ▁and ▁a ▁single ▁M G ▁ 1 3 1 ▁machine ▁gun ▁in ▁an ▁He ▁ 1 7 7 A - 1