Carbon Cycle Chemical Reactions Involved: Photosynthesis: Air and water molecules and the energy from the sun to produce a simple sugar such as glucose and oxygen molecules as a by product. During photosynthesis plants use carbon dioxide and produce oxygen.
Similar to shore power for ships, a ground power unit (GPU) may be used to supply electric power for an aircraft on the ground, to sustain interior lighting, ventilation and other requirements before starting of the main engines or the aircraft auxiliary power unit (APU).
The purple wire will run directly from the neutral start switch on the column to the bulkhead connector at the firewall, and then to the starter. Manual trans vehicles had the purple/ white stripe to the clutch switch and the purple feed from the reverse lockout switch on the column.