Electrical Components Used in Aircraft

Starter Generator. It is a DC machine with compound excitation used in aircraft.  It is designed for starting the engine and then to serve as a DC supply source to the aircraft and charge the storage battery. The main aircraft engine drives the starter generator. Ampere Hour Meter. An integrated ampere-hour meter serves to indicate the capacity of the storage batteries. In AH Over Voltage Protection Unit. This unit is intended to protect the generator from overloading due to increased voltage in case of regulator failure. When the voltage increases beyond a safe…

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Introduction to AC & DC Generators

In most of the earlier aircrafts, the aircraft electrical systems were planned on a basic DC power source. For DC power supply DC generators were used and for AC power requirements Invertors and alternators were used. With increased power requirements the basic DC power supplied by generators were found inefficient due to some related problems like commutation and high altitude operations. To overcome these difficulties all the modern aircrafts are now using AC as basic power source, generated by alternators. In modern aircrafts, the latest aircraft electrical system has become…

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Construction of Various Types of Direct Reading Compass

Direct Reading Compass The purpose of liquid compass is to indicate in which direction the magnetic north pole lies, to enable and ac position to be determine with respect to that pole. They are classified under two headings.  (a) Pilot Type. It is used to indicate the magnetic heading of the aircraft.  (b) Observer Type. It is used with adjustable sights to enable bearing to be taken of distant object (ac) Pilot Type. The magnetic compass is a simple, self-contained instrument, which operates on the principle of magnetic attraction. It is designed to indicate the direction in which…

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Requirement, Service and Maintenance of Oxygen System

Requirements of Typical Oxygen Installation. The requirement which to be have satisfied to unable an oxygen installation to function efficiently is as follows:  (a) A means of storing oxygen in the aircraft.  (b) A means regulating the flow to the crew member only as he breathes in and an indication that oxygen is flowing to his position.  (c) A means of regulating the oxygen to the user remembering that the higher it files, the more oxygen, he will require.  (d) The means of coupling various components together and switching them on and…

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Different Types of RPM Gauges

Exhaust Gas Temperature System.      The thermometer is used in jet engine aircraft to indicate the temp of exhaust gas. The Exhaust Gas Temperature indicating system provides a visual temperature indication in the cockpit of the turbine exhaust gases as they leave the turbine unit. A gas temperature thermocouple is mounted in a ceramic insulator and incased in metal sheath; the assembly forms a probe, which projects, into the exhaust stream. The thermocouple is made from Chromel (A Nickel/Chromium Alloy) and Alumel (a Nickel/Aluminium alloy). The hot junction protrudes into a…

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Purpose of Aircraft Instruments

In aircraft there are millions of parts and all of them play a vital and specific role to perform for the aircraft to fly safe and land safely. Some of them are not required to be monitored during the flight hours as they are maintained by the servicing crews available in ground. But some of the components require a continuous attention during flight hours by the air crew in order to keep the aircraft fly safe and those aviation instruments keep indicating the flight details so that the pilot keep monitoring it and know the real…

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Introduction to Metallurgy

The single most used material today in the Industry is Metal. The reason for the increased use of the metals is due to its wide range of properties: Lustre Hardness Low specific heat Plastic deformability Good thermal conductivity Relatively high melting point Strength Ductility Malleability Opaquity Stiffness Rigidity Formability Machinability Weldability Castability Dimensional stability Metals are found in nature in the form of ores.  The science of metallurgy includes deriving the metals from its ores, its purification, alloying with other metals and finally manufacture into shape and forms usable in…

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Structure of Materials

It should be clear that all matter is made of atoms. From the periodic table, it can be seen that there are only about 100 different kinds of atoms in the entire Universe. These same 100 atoms form thousands of different substances ranging from the air we breathe to the metal used to support tall buildings. Metals behave differently than ceramics, and ceramics behave differently than polymers. The properties of matter depend on which atoms are used and how they are bonded together. The structure of materials can be classified…

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Structure of Atom

An atom consists of Protons, Neutrons and Electrons. The Protons (+ve charged particles) and Neutrons form the nucleus of the atom around which the Electrons (- ve charged particles) rotate. The number of protons in the nucleus is referred as its Atomic number. The Mass number is the number of protons and neutrons of an atom. The atom is the smallest particle of an element that can enter into a chemical combination with another element. A molecule (group of atoms)  is the smallest particle of an element or compound that…

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Physical Metallurgy & Structure of Solids – Ionic Solids

Solid materials are made up of large collection of atoms where the individual atoms are bonded together. The type of bonding which exists between atoms is different for all material. An atom with a completely filled outer electron shell has a high degree of stability. The atoms of other elements with incomplete outer shells attempts, by combination with other atoms, to satisfy this condition for stability. The principal types of inter atomic bonds which may be formed are the ionic, covalent, metallic, Van Der Wall’s or molecular bonds. The solids…

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