9-Rudder_Rudder trim control systems
10-Engines_non-turbocharged
10A-Engines_turbocharged
11-Fuel system
12-Propellers_Propeller governors
13-Utility systems
14-Instruments_Instrument systems
15-Elecrtical systems for early to 1970 model
15A-Elecrtical systems for 1971 and after model
16-Structural repair