![]() Whenĭocking at a wharf, the steering oar would be in the way. Steorbord comes from this steering oar, from which the term starboard for the right side of a ship originates. Since most people are right handed, the steering oar was attached to the right side of the boat. You can see one in the following tapestry: Our story begins in ancient times, long before aviation took off.Įarly boats were steered with a steering oar attached to the side of the boat. Let me expand a bit on that: Ancient Boats Ergo, you would want to have this TR powered up and running first in case you lose AC power to the aircraft during start. TR 3 is an important TR from which significant avionics are powered. Looking at the electrical schematic that Boeing provides, we see that Transformer-Rectifier (TR) 3 is powered from the R/H AC Bus. It powers the yellow hydraulic system, which pressurizes the parking brake When starting with external air or power it is normal to start Engine number 1 because it is further away from the carts.Īccording to Flight Crew Operations Manual (FCOM) 3 Standard Operating Procedures (SOP):Įngine 2 is normally started first. Engine number 2 start Exhaust Gas Temperatures (EGT) are generally higher.Įngine number 2 is started first because it's on the opposite side of the air bridge. The isolation valve in Open or Auto ensures that the Auxiliary Power Unit (APU) bleed air reaches the engine number 2 starter.
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