The most common form of propulsion of aircraft is through the form of the gas turbine engine, such as the turbojet and turbofan. Gas turbine engines function by combusting liquid hydrocarbon fuel, creating mechanical energy in the form of high pressure and high temperature airstreams that are harnessed by the airplane propeller, which results in thrust. This thrust is what propels the aircraft and enables it to take flight successfully.

Although there are various forms of power plants, including internal combustion engines and electrical drives, there are various distinguishing factors of gas turbine engines that separate them from other types, while also providing benefit to aircraft. With all engines, there is waste heat that is created that must be rejected, and the drawbacks of this heat increase along with airspeed. With gas turbine engines however, this heat travels out as exhaust and actually works to generate positive thrust. Many gas turbine engines, such as high bypass ratio turbofan engines, are at constant throttle settings that vary in the same ways that current airliners need. These airliners require about three to five more times the thrust to take off than they do to cruise. This enables gas turbine engines to be very well suited for such airliners, also providing the benefit of increased motor efficiency during cruise flight.

With gas turbine engines, there is a tradeoff between the high thermal loads placed on turbine parts with the performance demands, and heat poses a risk with gas temperatures so high that it actually begins to soften and melt the metal of the engine. The intense heat of these gas paths must be combatted, and there are a few ways in which they are. One method in which intense gas heat is combated is through using complex channels within components that are created specifically for blowing cool air through to cool the engine. Another method that proves useful is sending the cool air into the path of hot gas so that it begins to form a protective film around the turbine. With both of these methods, there is some cost of engine efficiency, but the component life expectancy is increased.

While there are other types of engines that are finding a slow rise in popularity, the gas turbine engine still remains as the dominant type in high speed aviation for the foreseeable future. Leading industrial nations also recognize the continued lucrativity of these turbines and continue their investment in them. With their benefits to aircraft thus far, gas turbine engines prove very beneficial for aircraft manufacturers and jet engine manufacturers as a whole.

At Parts Needed Yesterday, owned and operated by ASAP Semiconductor, we can help you find jet engines and components parts you need, new or obsolete. As a premier supplier of parts for the aerospace, civil aviation, and defense industries, we're always available and ready to help you find all the aviation parts and equipment you need, 24/7x365. For a quick and competitive quote, email us at sales@partsneededyesterday.com or call us at +1-434-321-4470.



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Due to the demands and stresses they operate under, fasteners used in the aerospace industry must be manufactured under incredibly strict high-quality and high-precision design and manufacturing standards. The aerospace industry uses a wide variety of fasteners, such as screws, rivets, nuts, bolts, pins, and collars.

As aerospace equipment is exposed to extreme environments, such as high pressures and temperatures from leaving the earth’s atmosphere and exposure to burning rocket fuel, they must be designed and constructed to endure these conditions, even down to the fasteners that hold them together. As a result, several different designs of high-quality fasteners have been developed which are suitable for the specifications and standards of the aerospace industry, each of which exhibits different characteristics and qualities.

  • Aerospace fasteners must possess:
  • High corrosion and oxidation resistance
  • High tensile, shear, and fatigue strength
  • Lightweight construction to optimize lift in planes and minimize fuel costs in rockets
  • Operational capabilities in extreme environments like low and high temperatures and pressures.
  • Self-sealing and self-locking capabilities to prevent fluid and pressure leaks and loosening during operations.

Aerospace fasteners are typically made from aluminum, steel, titanium, and superalloys. Aluminum is most often used in atmospheric aircraft, and can be used in aerospace applications as well, provided it receives the proper surface treatments. Although aluminum rivets are common, achieving aerospace standards requires that it be cold head formed. Even then, the material is sensitive to temperatures above 250 degrees Fahrenheit, as well as stress-induced corrosion.

Steel and its various alloys feature high strength and surface hardness. However, steel is also heavier than other materials, which can create issues when designing aircraft and spacecraft. Stainless steel and steel alloys are the main types of steel used in aerospace, but certain types are susceptible to heart damage and failure. Therefore, choosing the right type for the job is critical.

  • Series C300 corrosion resistant (CRES) stainless steel is not as heat resistant as others, and is primarily used for aircraft screws, bolts, and some fastener covers.
  • CRES series 400 is more heat resistant, but more vulnerable to corrosion.
  • Precipitation-hardened PH stainless steel of various grades is used for some fastener applications.
  • Alloy steels are durable, but vulnerable to corrosion.

There are surface treatments to prepare steel for aerospace applications, but these can also decrease the metal’s carburization and resistance to tension corrosion.Titanium can serve as an alternative to aluminum, as it is as strong as steel, relatively light, and can operate at -350 to 800 degrees Fahrenheit.

Superalloys are commonly used as fasteners due to their ability to withstand many different types of stresses. They are versatile, able to maintain structural and surface integrity in extreme environments and are resistant to creep factors. Commonly used superalloys include:

  • A286: an iron-nickel-chromium alloy that can withstand temperatures between -420- and 1200 degrees Fahrenheit, and is often used in engines, superchargers, and turbines.
  • H-11: a 5% chromium steel alloy with high impact resistance and hardness, making it useful for landing gear assemblies.
  • Hastelloy: a nickel-molybdenum-chromium superalloy with high corrosion resistance, used in combustion and exhaust components.
  • Inconel-718: Nickel-based superalloy, retains a 220ks (kilopound per square inch) tensile strength up to 900 degrees Fahrenheit.

At Parts Needed Yesterday, owned and operated by ASAP Semiconductor, we can help you find all the fasteners for the aerospace, civil aviation, and defense industries. We’re always available and ready to help you find all the aviation parts and equipment you need, 24/7-365. For a quick and competitive quote, email us at sales@partsneededyesterday.com or call us at 1-434-321-4470.


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When it comes to aircraft maintenance and overhauls, one of the most intricate procedures is engine replacement. It can also be one of the most expensive, especially if something goes wrong during the overhaul itself, or afterwards during operations. Therefore, here are some key things to keep in mind if you’re considering an engine replacement.

First of all, make sure that you actually need a replacement to begin with. Reasons for considering a replacement can range from wanting increased power, to having what you think is a completely broken, un-repairable engine. But before you commit, make sure that it’s your only option!  You want to be absolutely certain that engine replacement is your only choice before pursuing it.

Next, find a reputable replacement service. Not all facilities are equipped to remove and replace an engine completely, and the old fears of mark-ups and being exploited are also prevalent. Always make sure to find a trustworthy, experienced and certified overhaul center that can help you and clearly explain just what exactly they are doing to your aircraft.

You’ll have to decide on a replacement engine obviously, and this means doing your homework. Not all engines work on all aircraft, and it’s important that you find the right combination of power, performance, and reliability when choosing yours. There are also issues of weight, balance, and mountings that need to be addressed as well; it won’t do you any good to buy a new engine if it won’t even fit on your aircraft, after all.

 Lastly, once the replacement is completed, you’ll want to pay close attention to it while in operation to make sure everything is running properly. If something sounds off, or your instruments are reporting abnormal readings, get it checked as soon as possible by a professional.        

At Parts Needed Yesterday, owned and operated by ASAP Semiconductor, we can help you find aircraft engine parts as well as all other parts for the aerospace, civil aviation, and defense industries. We’re always available and ready to help you find all the parts and equipment you need, 24/7-365. For a quick and competitive quote, email us at sales@partsneededyesterday.com.



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To many, aircraft all look the same. It is a hollow metal cylinder with a tail and two wings on either side. There are those however who view aircraft just like they do cars. Engines are a hot topic in the world of mechanics. Depending on the engine, a machine can speed around a racecourse, take off into the sky, or slowly get you from point A to point B. Aircraft are defined in terms of their engines, with the three main types including turbojet engine, turbofan engine and turboprop engine. Before going into detail about the pros and cons of each of these engine types, we should know where they began. Dr. Hans Van Ohain and Frank Whittle are recognized as the co-inventors of the jet engine. The inventors believed that there was a better way to power an aircraft than a piston-based engine. After all, the hardest part is over - aircraft were already in the sky. It was in 1939 that the first jet engine took flight. Now we can look into the different types of engines.

Turbojet engines are the most straightforward of engines (if you can call an aircraft engine straightforward). Aviation combustor, compressor and turbine exhaust all work in unison to propel the aircraft forward. Inlet air is compressed and combined with fuel in the combustion chamber where it is ignited. The expanding drives a turbine, which in turn, supports the engine operation. Finally, the exhaust gases are expelled in such a way that they generate thrust.

Although turbojet engines are reliable, most commercial airlines use aircraft powered by turbofan engines. As the name suggests, these engines specialize in the flow of air around the engine. Additional thrust is produced an internal fan at the front, which directs a secondary airflow around the combustion chamber. The air and fuel mixture is ignited the same was a turbojet engine, however the additional airflow helps to cool the engine down. Modern turbofan engines have two compressors and two fans, doubling the engine efficiency. Turbofan engines can be thought of as the more efficient, streamlined version of the turbojet engine. Fuel consumption and flight costs are lower than turbojet engine aircraft.

If you spot a propeller on the outside of your aircraft, that is a fair indicator of a turboprop engine. The key to a turboprop engine is the reduction gear. The exhaust gases drive a turbine that is connected to a reduction gear. Essentially the aircraft propeller operates at a higher speed than the engine, therefore reduction gear is used to slow down the propeller. There are multiple operating benefits with the turboprop engines. They perform well at slow airspeeds for example during takeoff and landing. The fuel efficiency also rivals that of the turbofan.

The final type of engine is normally found in helicopters or acts as an Auxiliary Power Unit. Unlike the other engines, turboshaft engines drive a shaft that is connected to a turbine rather than a propeller. Turboshaft engines are smaller in size and weight compared to piston engines.

Although they may look the same at a glance, aircraft are all very different under the hood or, in aircraft terms, under the nacelles.

At Parts Needed Yesterday , owned and operated by ASAP Semiconductor, we can help you find all the jet engine parts for the aerospace, civil aviation, and defense industries. We’re always available and ready to help you find all the parts and equipment you need, 24/7-365. For a quick and competitive quote, email us at sales@partsneededyesterday.com or call us at +1-434-321-4470.



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There are five main types of jet engines. Jet engines, excluding the ramjet, all have four basic stages: intake, compression, combustion, and exhaust. These systems convert heat energy and high-pressure air to produce thrust. Thrust may be generated through high power exhaust or through propeller systems. Each type of jet engine has its own unique properties.

  • Turbojets

 After the air enters through an inlet, it enters the compressor. The compressor may be axial or centrifugal. Air flows through an axial compressor parallel to the axis of rotation, while air flows through a centrifugal compressor perpendicular to the axis of rotation. Centrifugal compressors are less effective at creating thrust and are less fuel efficient, but they increase enough pressure for efficient combustion within one stage and are easier and more cost effective to manufacture. After the air is compressed, it passes through the combustion chamber. In there, the fuel/air mixture is ignited, and the resulting gases are expelled and thrusts the aircraft forward.

  • Turboprops

Turboprops are similar to turbojets. The difference is that the energy generated from combustion is used to power a propeller instead of to produce exhaust. Most of the aircraft that have turboprops are small airliners and transport aircraft because they are more efficient at flight speeds below 500 mph. Air and gas pressure is also used to rotate the turbine, which is connected to the compressor, and therefore powers it throughout the flight.

  • Turbofans

Turbofans are used on most commercial airliners because they increase efficiency. They are similar to turbojets, but instead of passing all of the air through the compressor and combustion chamber, the remaining air passes through a fan and the cold air is mixed with the hot gas and used to increase exhaust power. This increases the thrust without increasing fuel consumption.

  • Turboshafts

Turboshafts are similar to turboprops but instead of powering a propeller, it powers a helicopter rotor. The speed of the helicopter’s rotor is independent of the rotating speed of the gas generator, which allows the rotor speed to remain constant.

  • Ramjets

Ramjets are primarily used in guided-missile systems and space vehicles. This is due to the fact that they require assisted takeoff and they produce small amounts of thrust below the speed of sound. They are similar to turbojets, but do not contain the rotating machinery. Their compression ratio depends on forward speed.

At Parts Needed Yesterday, owned and operated by ASAP Semiconductor, we can help you find all the engine parts you need, new or obsolete. As a premier supplier of parts for the aerospace, civil aviation, and defense industries, we’re always available and ready to help you find all the parts and equipment you need, 24/7x365. For a quick and competitive quote, email us at sales@partsneededyesterday.com or call us at +1-434-321-4470.



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Stan Lee, may he rest in peace, helped create the icon that is X-Men’s Magneto. The fictional character, created in 1963, shares the name of a magneto component, which has been in operation since 1903— suggesting that he may have based the character on this powerful electrical generator. Both Magnetos utilize the basic functioning principles of a magnetic field— let’s take a look at how a magneto component is put to work in aviation. Generally speaking, ignition systems need to generate high voltage in a small window of time, we’re talking around 20,000 volts in an instant.

What is an Aircraft Magento? How it Works?

A magneto is a simple and reliable way to generate power for a spark plug; it works very similarly to an electromagnet, but it achieves its magnetic field in a slightly different way. Electromagnets are used in various battery configurations. A coil of wire around an iron bar acts as the armature; and when current is applied to this coil, the coil creates a magnetic field within the armature. In the case of an electrical generator, a magnet is rotated past the armature to create electric current in the coil. Finally, a distributor carries the current to a spark plug.

Now, in the terms of aircraft magneto configuration, they provide power to fire aircraft spark plugs. Most aircraft will have a dual arrangement system. An ignition system separate from the electrical system of an aircraft is necessary in the event of alternator or battery failure. Aircraft magneto systems can consist of up to fifteen parts and fasteners, but there are five essential components: the armature, primary coil, secondary coil, electronic coil unit, and a pair of permanent magnets. The magneto assembly within piston engines and turbocharged engines differ to some degree.

In a piston engine, two magnetos operate on separate ignition systems. A piston aircraft has two aircraft spark plugs equipped per cylinder, and therefore will have a left and right aircraft magneto. The dual arrangement allows for more efficient combustion and ensures that the ignition will continue to spark despite a failure of one ignition system.

Turbocharged engines on the other hand, may require a specialized magneto in the event that a pressurized system is needed. In this case, the configuration must prevent incoming air from being ionized. To accomplish this, air flow from the turbocharged system can be diverted to the aircraft magnetos. A discrete opening is located at the bottom of the component, allowing a small amount of air leakage, and providing a constant flow of air to the generators.

The magnetic flux of a magneto electrical generator is extremely useful to aircraft ignition systems. They are a self-contained and independent system that are used time and time again due to their reliability, compact structure, and simple design.

At Parts Needed Yesterday, owned and operated by ASAP Semiconductor, we can help you find a magneto parts supplier, and new or obsolete magneto parts. As a premier supplier of parts for the aerospace, civil aviation, and defense industries, we’re always available and ready to help you find all the parts and equipment you need, 24/7x365. For a quick and competitive quote, email us at sales@partsneededyesterday.com or call us at +1-434-321-4470.


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Gas turbine engines power most modern aircraft and have streamlined air travel and aircraft technology as we know it. The differences between modern turbine engines tend to rely on how exhaust is utilized to create thrust. Overall, the parts of a turbine engine will usually include the following components: inlet/s, compressor, burner, turbine, and exhaust nozzle. Turbine engines used in modern aircraft are separated into 4 categories: turbojet engine, turboprop engine, turbofan engine, and afterburning turbojet engine.

Turbojet Engine

Aircraft with this engine utilize basic turbine functionality. Air is received through an inlet and transferred to a compressor where pressure increases as the air travels to the turbine blades. Air pressure is at its highest as it enters the burner and is mixed with fuel. The turbine blades spin the heated air and release exhaust, creating thrust to power the aircraft. Excess thrust is passed through a central air shaft and feeds power to the compressor.

Turboprop Engine

Units of this variation function similarly to turbojet engines. Their proprietary components include a core turbine engine and propeller. In contrast to a turbojet engine, exhaust in a turboprop is used to power thrust and the propeller. Aircraft with a turboprop will typically have two compact turbine stages equipped to their fuselage—a standard turbine to power thrust, and secondary unit to power the propeller.

This assembly allows exhaust to travel through a drive shaft to the additional turbine, and into a gearbox to feed power to the propeller. The turboprop design becomes less efficient as the aircraft speed capability increases.

Turbofan Engine

This system is utilized by most modern aircraft. It is capable of high thrust and has the leading fuel efficiency of any turbine engine. In this configuration, two fans are positioned as front and rear bookends to the core engine. Known as the fan and fan turbine, the two components are connected to an additional fan shaft. Exhaust passes through the fan shaft to the core shaft and is expended from the nozzle creating what is referred to as a two-spool engine arrangement.

Excess incoming air is circulated around the core engine. The two-spool arrangement gives the turbofan engine a low bypass ratio as air passes through, and past, the core shaft. When this occurs, the fuel flow rate is changed, giving the turbofan engine more thrust than a turbojet on the same amount of fuel.

Afterburning Turbojet Engine

The component utilized by this type of turbojet is known as the “afterburner”, though the mechanism can also be installed on turbofan engines. Turbojet engines with this addition capitalize on the low bypass ratio turbofan design but add a unique component. Fighter jets and supersonic aircraft need engines that are capable of two main functions: high thrust that is quick to engage, and concession for any added drag. An afterburner manages to provide just this by injecting fuel into hot exhaust. In this case, a collection of flames in a ring are located directly after the nozzle. The component extends, and fuel is injected into the incoming exhaust. Mechanically, this allows an easy and quick way to activate thrust, however, the extra fuel injection is largely inefficient.

At Parts Needed Yesterday, owned and operated by ASAP Semiconductor, we can help you find all the turbojet engine parts, and turboprop propulsion system parts and assemblies you need, new or obsolete. As a premier supplier of parts for the aerospace, civil aviation, and defense industries, we’re always available and ready to help, 24/7x365. For a quick and competitive quote, email us at sales@partsneededyesterday.com or call us at +1-434-321-4470.


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Since the Wright Brothers’ first flight in 1903, the aviation industry has changed quite a bit. But, one of the most crucial components, the reciprocating engine, has not.

The reciprocating engine is a heat engine used on propeller aircraft that uses one or more reciprocating pistons to convert pressure into rotary motion in order to turn the propeller. The reciprocating engine can be started in various ways, depending on size of the engine. For aircraft flying at higher altitudes, starting the aircraft is troublesome due to lubricating oil congealing at higher altitudes. For smaller and older aircraft, the starting system used are inertia starters. Although there are not many left with inertia starters, it’s important to know the different types of inertia starters.

There are three inertia starters that include hand, electric, and combination of the two. Inertia is the resistance of any physical object to any change in its velocity. The inertia starters use the transfer of energy to start the reciprocating engine. As the motion of cranking—by hand— or rotation—by an electric motor— is initiated, the energy is transferred linearly or rotationally. And, the movable parts, such as reduction gears, the shaft, and the flywheel begin to move. When the starter is engaged, the energy is transferred to the flywheel, and then to the engine. The motions involved for the hand crank and the electric motor are similar. The electric motor just requires additional equipment and mechanisms to engage and disengage the starter. The electric motor also uses helical motion to produce the required torque needed to reach the necessary speed. Once the necessary speed is reached, the starter automatically disengages.

Parts Needed Yesterday, owned and operated by ASAP Semiconductor, should always be your first and only stop for all your aircraft reciprocating engine part needs. Parts Needed Yesterday is a premier supplier and distributor of reciprocating engine aircraft parts, whether new or obsolete. Parts Needed Yesterday has a wide selection of parts to choose from and is fully equipped with a friendly and knowledgeable staff that is always available and ready to help you find the parts you need, 24/7x365. If you’re interested in a quote, email us at sales@partsneededyesterday.com or call us at +1-434-321-4470.


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