Why do passenger embark on the left side of an aircraft?).īefore Auxiliary Power Units (APUs) existed, you had start a main engine to get electrical power (without draining This tradition lives on until today (see also Is why passengers had to board the aircraft from the left side. How did these flying boats dock when they arrived at a port? Of course with the port side towards the port. What's the reason for pilots wearing uniforms?). Nautical miles for distances) and why pilot uniforms look like Navy uniforms rather than Air Force uniforms (see also This is also the reason for why we are using many nautical terms in aviation (like e.g. Flying boats could just land on a river, a Particularly ones with long enough runways for larger and larger aircraft. In the beginning of aviation, most passenger aircraft were flying boats because very few airports existed at the time, What does all of this have to do with aviation? Enter the flying boat: Modern ships use rudders on the centreline of the ship, so they can dock from both sides. That is why boats always docked from the left side, hence called 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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