ˌʌndɚ kɹˈuːz kəndˈɪʃənz ænd ɪn ɡɹˈaʊnd ɪfˈɛkt, ðə fɹˈʌnt ˈɛndʒɪnz kʊd biː ʃˈʌt ˈɔf sˈɪns ðɛɹ pˈaʊɚ wʌz ʌnnˈɛsᵻsɚɹi tə kˈiːp ðɪ ˈɛɹkɹæft ɐlˈɔft; ðɪs ˈɔːlsoʊ mˈɪnɪmˌaɪzd ˈɪnteɪk ʌv wˈɔːɾɚ, sˈɔlt ænd lˈoʊ flˈaɪɪŋ bˈɜːdz.
Under cruise conditions and in ground effect, the front engines could be shut off since their power was unnecessary to keep the aircraft aloft; this also minimized intake of water, salt and low flying birds.