Boeing

What is SL on Boeing 737? (Service Letter)

What is MOD on Boeing 737? (Modify)

What is MHRS on Boeing 737? (Magnetic Heading Reference System)

What is T/M on Boeing 737? (Torque Motor)

What is BITE on Boeing 737? (Built-In-Test-Equipment)

What is ECS on Boeing 737? (Environmental Control System)

What is GS on Boeing 737? (Glide Slope)

What is PCU on Boeing 737? (Power Control Unit)

What is F/F on Boeing 737? (Fuel Flow)