Boeing

What is XFMR on Boeing 737? (Transformer)

What is B/C on Boeing 737? (Back Course)

What is PTT on Boeing 737? (Press To Talk/Push To Talk)

What is HDG REF on Boeing 737? (Heading Reference)

What is T OR TK OR TRK on Boeing 737? (Track)

What is FOD on Boeing 737? (Foreign Object Damage)

What is DPCT on Boeing 737? (Differential Protective Current Transformer)

What is RNAV on Boeing 737? (Area Navigation)

What is ELCU on Boeing 737? (Electrical Load Control Unit)