𝐀𝐮𝐱𝐢𝐥𝐢𝐚𝐫𝐲 𝐏𝐨𝐰𝐞𝐫 𝐔𝐧𝐢𝐭

🛫An Auxiliary Power Unit is a device on a vehicle that provides energy for functions other than propulsion.

🛫It provides power other than from propulsion systems, the main purpose of APU aircraft to provide power when starting engines.

🛫APU is used to run the support systems when the engine is turned off, this causes the cabin air be comfortable, some APU also connected pump hydraulic that allows to operate the equipment hydraulic (flight control) before starting the machine (turbine, propeller, jet).

🛫There are some part APU such as: generator, oil filter, fuel nozzles, oil tank, bleed water manifold, etc.

🛫They are commonly found on large aircraft and naval ships as well as some large land vehicles 🛫Aircraft APUs generally produce 115 V alternating current (AC) at 400 Hz(rather than 50/60 Hz in mains supply), to run the electrical systems of the aircraft; others can produce 28 V direct current (DC).

🛫APUs can provide power through single- or three-phase systems.

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𝐓𝐲𝐩𝐞𝐬 𝐨𝐟 𝐂𝐨𝐦𝐛𝐮𝐬𝐭𝐢𝐨𝐧 𝐂𝐡𝐚𝐦𝐛𝐞𝐫𝐬

🛩️A combustor is a component or area of a gas turbine, ramjet, or scramjet engine where combustion takes place. It is also known as a burner, combustion chamber or flame holder. In a gas turbine engine, combustion chamber is fed high pressure air by the compression system. 🛩️The combustor then heats this air at constant pressure. After heating, air passes from the combustor through the nozzle guide vanes to the turbine. In the case of a ramjet or scramjet engines, the air is directly fed to the nozzle. 𝐀𝐧𝐧𝐮𝐥𝐚𝐫 𝐓𝐲𝐩𝐞 ✈️The most commonly used type of combustor is the fully annular combustor. Annular combustors do away with the separate combustion zones and simply have a continuous liner and casing in a ring. There are many advantages to annular combustors, including more uniform combustion, shorter size, lighter, and less surface area. Annular combustors tend to have very uniform exit temperatures. They also have the lowest pressure drop of the three...

𝐖𝐞𝐭-𝐒𝐮𝐦𝐩 𝐎𝐢𝐥 𝐒𝐲𝐬𝐭𝐞𝐦

Wet Sump Oil System ✳️The engine oil system performs several important functions: 🛩️Lubrication of the engine’s moving parts . 🛩️Cooling of the engine by reducing friction . 🛩️Removing heat from the cylinders . 🛩️Carrying away contaminants . 🛩️Providing a seal between the cylinder walls and pistons. ➡️Subscribe us for more aircraft knowledge and aircraft fact⬅️ ➡️Do Share with your Friends⬅️

𝐀𝐏𝐔 𝐅𝐢𝐫𝐞 𝐃𝐞𝐭𝐞𝐜𝐭𝐢𝐨𝐧 & 𝐄𝐱𝐭𝐢𝐧𝐠𝐮𝐢𝐬𝐡𝐢𝐧𝐠 𝐒𝐲𝐬𝐭𝐞𝐦

APU Fire Detection & Extinguishing System 🛩️The APU fire protection system is similar in design to engine fire protection systems, but there are some differences. The APU is often operated with no personnel in the flight deck and; the APU fire protection system can operate in an unattended mode on the ground with the engines not running. 🛩️If there is an APU fire in the unattended mode, the fire extinguisher discharges automatically. The APU operates in the attended mode when at least one engine is running. If there is an APU fire in this mode, the crew discharges the bottle manually. Fire switches are located on the cargo fire/ engine control panel and the service and APU shutdown panel located outside the airplane on the nose landing gear. 🛩️If there is an APU fire, the APU fire detection system gives fire warnings and automatically stops the APU. The APU fire warning light comes on to identify the correct fire switch to use to extinguish the fire. The fire switch sole...

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