Technical

air conditioner; air conditioning device
aparelho de ar condicionado - (Refrig.)

air conditioning system
ar condicionado - (Refrig.)

air pilot
aeronauta -

air space
espaço aéreo -

axle spindle
ponta de eixo - (Metal.) - Fonte: https://www.slideshare.net/caulinolima/dicionario-de-termos-tecnicos-cat

battery-powered scoop
(pá) escavadeira (movida) a bateria - (Eng. Mec.) - Fonte: https://www.proz.com/kudoz/english-to-portuguese/mechanics-mech-engineering/6580471-battery-powered-scoop.html

black-spotted dart
traquinoto - (Biol.) - Fonte: https://www.proz.com/kudoz/english-to-portuguese/biology-tech-chemmicro/6590255-black-spotted-dart.html

blackspot snapper
(peixe) caranha de Dory; caranga Dóri - (Biol.) - https://www.proz.com/kudoz/english-to-portuguese/biology-tech-chemmicro/6590258-blackspot-snapper.html

box placket
carcela dupla / quadrada - (Têxtil) - Fonte: https://www.proz.com/kudoz/english-to-portuguese/textiles-clothing-fashion/6592222-box-placket.html

brake pad
pastilha de freio - (Autom.) - https://pt.wikipedia.org/wiki/Pastilha_de_freio