Boeing 737

What is ENWY on Boeing 737? (Entryway)

What is CALIB on Boeing 737? (Calibrator)

What is MAG on Boeing 737? (Magnetic)

What is CB on Boeing 737? (Circuit Breaker)

What is ADP on Boeing 737? (Air Driven Pump)

What is ELEC on Boeing 737? (Electrical)

What is DFDR on Boeing 737? (Digital Flight Data Recorder)

What is GCB on Boeing 737? (Generator Circuit Breaker)

What is STD on Boeing 737? (Standard)