24-Electric
Power
26-Fire Protection
28-Fuel
37-Vacuum
37-10
Vacuum Supply Drive
54-Engine
Mount
61-Propellor
71-Powerplant
72-Engine
73-Fuel
& Control
74-Ignition
75-Air
76-Control
77-Indicating
78-Exhaust
79-Engine
Oil
80-Starting
83-Gearbox