Boeing 737

What is PSEU on Boeing 737? (Proximity Switch Electronic Unit)

What is TFC on Boeing 737? (Traffic)

What is SPD on Boeing 737? (Speed)

What is ACT on Boeing 737? (Active)

What is ANS on Boeing 737? (Alternate Navigation System)

What is PDU on Boeing 737? (Power Drive Unit)

What is A/C on Boeing 737? (Air Conditioning)

What is APB on Boeing 737? (Auxiliary Power Breaker)

What is STCM on Boeing 737? (Stabilizer Trim Control Module)