Removing an aircraft’s engine can be one of the most difficult and complicated procedures in aircraft maintenance. Given the enormous variety in aircraft and engine designs, there is no single list of instructions that can be provided as a guideline, as every airframe and every engine layout will inevitably have a different checklist that must be followed. There are, however, universal requirements that every engine will have that must be fulfilled, such as disconnecting and reconnecting the electrical, hydraulic, and fuel supply lines, the intake and exhaust path components, the engine controls, and the engine mounting connections to the airframe. One should always refer to the engine manufacturer’s instructions when performing any type of engine removal or installation.

Engines are removed for a number of reasons, the first and most common being that the engine or a component within it has exceeded its operational lifespan. Lifespan depends on variables like operational use, quality of manufacture or overhaul, the degree of maintenance performed, and the types of operations being carried out by the aircraft. The manufacturer sets engine removal times based off of these factors. Based on service experience, it is possible to establish a maximum expected time before overhaul (TBO) or span of time within which an engine needs to be overhauled. Regardless of condition, an engine must be removed when it has accumulated the recommended maximum allowable time since its last overhaul. Regardless of its condition, an engine must be removed when it has accumulated the recommended maximum allowable time since its last overhaul.

Another common reason for removal is sudden stoppage. Sudden stoppage is a rapid and complete stoppage of the engine’s functions, and can be caused by engine seizure, or by a propeller blade striking an object in such a way that the revolutions per minute drops to zero in less than one complete revolution of the propeller. Sudden stoppage occurs under conditions like complete and rapid collapse of the landing gear, nosing over of the aircraft, or crash landing. A sudden stoppage can cause internal damage to components like the propeller gear teeth, the gear train, the crankshaft counterweights, and the propeller bearings. When sudden stoppage occurs, disassembly and replacement is almost always required.

Another reason for removal and disassembly is when metal particles in the engine oil screens or magnetic chip detectors are found. This can mean that there is an internal failure in the engine, and something is falling apart. However, carbon that breaks loose in the interior of the engine can come in rock-like pieces that resemble metal, so to check against this, simply place any suspect particles near a magnet. If they are affected, it means that they are made of metal and something is broken inside the engine.

Other common reasons for engine removal include excessive engine vibration (especially in turbines), backfiring and misfiring, and overall low power output.

At ASAP Components, owned and operated by ASAP Semiconductor, we can help you find all the engine removal and maintenance equipment for the aerospace, civil aviation, and defense industries. For a quick and competitive quote, email us at or call us at 1-919-348-4040.

Read more »

In electronics and electrical engineering, fuses are electrical safety devices that are designed to provide overcurrent protection of an electrical circuit. The most essential component is a metal strip or wire that melts when too much current flows through it, and therefore interrupts the current. Fuses are sacrificial devices, meaning that once a fuse has operated, it must be replaced or rewired.

Fuses have been used since the early days of electrical engineering, with the first examples of expendable wiring being used to protect electrical devices dating back to 1864 and Thomas Edison patented the first true fuse in 1890. There are now thousands of fuse designs, each with their own specific current and voltage ratings, breaking capacity, and response times. Time and current operating characteristics are especially important for providing adequate protection without needless interruption. Properly wired, fuses can prevent short circuits, overloads, mismatched loads, and device failure.

Fuses consist of the aforementioned metal strip or wire fuse, mounted between a pair of electrical terminals, and are usually enclosed by a non-combustible housing. The fuse is arranged in a series to carry all of the current passing through the protected circuit. The resistance of the element generates heat due to the current flow and influences the size and construction of the element; however, the heat produced cannot cause the element to reach an unsafely high temperature. The fuse element is made from aluminum, copper, silver, zinc, or alloys to provide stable and predictable characteristics. Ideally, a fuse can carry its rated current indefinitely, and melt quickly with little to no excess. A fuse element cannot be damaged by minor current surges and cannot oxidize or change its behavior after years of service.

Fuses have several parameters they must operate under. The rated current is the maximum current that the fuse can continuously conduct without interrupting the circuit. The speed at which a fuse blows depends on how much current flows through it, and the material the fuse is made of; it is not a fixed interval but decreases as the current increases. The breaking capacity is the maximum current that can be safely interrupted by the fuse. This should be higher than the prospective short-circuit current. For example, fuses for small, low-voltage residential wiring systems are commonly rated to interrupt 10,000 amps, while fuses for commercial or industrial power systems are rated for 300,000 amps.

At ASAP Components, owned and operated by ASAP Semiconductor, we can help you find all the fuse systems and parts for the aerospace, civil aviation, and defense industries. For a quick and competitive quote, email us at or call us at 1-919-348-4040.

Read more »

The electrical systems within an aircraft are extensive. Steps need to be taken to ensure that the system doesn’t overload causing a power outage on an aircraft. Resistors are electrical components that oppose the flow of electrical current. They are by nature, passive components that only reduce voltage rather than increase them. Wirewound resistors are cylindrical components with resistive wire wrapped around them. The rod is typically made of ceramic or fiberglass and the wire is usually made out of an alloy such as nichrome. An exterior casing insulates the wirewound resistors to help block any heat coming from the circuit interruption.     

The key to wire wound resistors is in the winding and the material of the wire. The level of resistance can be changed by adjusting the wire resistivity and wire length. A metal wire with high resistance opposes large amounts of electric current, while, a metal wire with low resistance blocks a small amount of electric current. The longer the wire, the more space the free electrons have to travel and collide with atoms, therefore the higher the resistance. During collision, energy is lost in the form of heat and only a small amount of electric current flows through the wire resistor. In comparison, electrons only have to travel a short distance, thus do not collide with atoms as frequently. The result is that a larger amount of electricity passes through the resistor. In a similar principle to the length of the wire, the size of the wire coil spiral directly affects the level of resistance. If the cross section of the coil is small, the electrons are more compact, so collide with the atoms, thus losing energy. If the coil is larger, the resistance is lower as more electrons escape collision and carry on through the resistor.

Two types of wire resistors are commonly used with aircraft equipment. Precision wire resistors are used for low temperature applications that require a high level of accuracy for example calibration equipment. Power wire resistors are used in instances of high temperature. In an aircraft, a power resistor can be found in the main electrical system as a current sensor. Due to their adaptability, wire resistors are a popular hardware component to use in aircraft. They can be manufactured in all different sizes and materials to suit the desired task. Compared to other resistors, wire resistors are low cost, have high accuracy and stability rates, and offer wide variances in resistance. The downfall of wire resistors is that, under high frequencies, the wire acts as an inductor.

At ASAP Components, owned and operated by ASAP Semiconductor, we can help you find all the wire resistors for the aerospace, civil aviation, and defense industries. For a quick and competitive quote, email us at or call us at +1 919-348-4040.

Read more »

Powerful ignition systems are integral to the functioning and efficiency of modern aircraft. Gas turbine engines like those seen on the General Electric CF6, depend on capacitor-type ignition systems for combustion. These systems are powered by a low-voltage DC power supply and utilize the same igniter parts to power the engine’s combustion process. 

Because of FAA requirements, a gas turbine engine ignition system is a dual system designed with redundancy in the event that a flight-critical part fails. The main structures you’ll come across in a gas turbine engine ignition system are: two exciter ignition units, two transformers, two intermediate ignition leads, and two high tension leads. A few components that are integral to these structures and ignition system functionality are ignition exciters, storage capacitors, and transformer windings.

A standard capacitor-type ignition system feeds low-voltage DC power, often a 24-volt DC input, to an exciter unit. The power supply encounters a filter just before it reaches the exciter unit to prevent interference with the aircraft avionics system. From here, the power is routed to two locations: a DC-motor that powers the multi-lobe cam and single lobe cam, and a storage capacitor.

The breaker points are actuated by the multi-lobe cam. They ensure that flow of current is one directional and channels the supply the auto transformer winding. Here, a magnetic field is created through the opening and closing of the breaker points. When the breaker is closed, the magnetic field of the transformer collapses, inducing a high-voltage feed. This input is passed through a rectifier, which limits flow to a single direction.

At this point, the storage capacitor receives the input power supply. The storage capacitor is attached to the spark plug igniter through a contactor and a dual winding triggering transformer. Once charge has built up on the capacitor, the contactor closes. Some of the high voltage charge flows through the primary winding of the transformer unit to a trigger capacitor. The rest of the high-voltage current is fed to the secondary transformer, where it ionizes the gap at the spark igniter. The spark igniter is now conductive, and the storage capacitor discharges accumulated energy in tandem with electrical charge from the trigger capacitor. This process allows the spark igniter to provide a series of sparks in a small fraction of time.

Once the engine is started, the ignition system is switched off. Combustion is considered self-sustaining at this point. While some ignition systems are manually operated by the pilot, most are manipulated by a Full Authority Digital Control System (FADEC). The electronic controls will auto-engage a continuous ignition process in the event of specified conditions such as a stall warning or flameout. An air-cooling fan airflow system is integrated within the ignition system to keep it operating safely, especially in the event that continuous ignition is needed. 

At ASAP Components, owned and operated by ASAP Semiconductor, we can help you find gas turbine engine parts, spark igniter parts, new or obsolete. As an ISO 9001:2015 certified and FAA AC-0056B accredited company, we’re committed to providing reliable parts you can trust. For a quick and competitive quote, email us at or call us at +1-919-348-4040.

Read more »

Traditional aircraft instruments include pitot instruments and gyroscopic instruments. These two designations simply categorize the instruments based on the system in which they receive the information. Gyroscopic instruments include the attitude indicator (AI), heading indicator (HI), and the turn coordinator (TC)— also known as the turn and bank (TB) indicator. Having knowledge of the instrument power system, gyroscopic principles, and individual operating principles of each instrument will help you understand how gyroscopic instruments operate.

Anything that spins exhibits gyroscopic principles. However, it is specifically titled a gyroscope if a wheel or rotor are mounted to utilize these properties. Gyros may be mounted freely, which allows them to rotate in any direction about its center of gravity. Restricted or semi-rigidly mounted gyros have one plane of freedom that is held fixed in relation to the base. Gyroscopes have high density and high speed with low friction bearings. Rigidity in space and precession are the two main properties of gyroscopic action. Rigidity in space is the ability of a gyroscope to remain in a fixed position in the plane that it is spinning. Precession is the tilting or turning of a gyro as a result of a deflective force.                      

Gyroscopes may be vacuum, pressure, or electrically powered. Usually, there are at least two sources of power used in order to ensure that one is available if the other fails during flight. Electrically driven gyroscopic instruments incorporate the rotor as the armature of an electric motor. Vacuum and pressure systems spin the rotor at high speeds by drawing a stream of air from the cabin and accelerate and directing it against the rotor vanes. There are separate instruments in the cockpit that display information about the vacuum pressure. If it drops below normal operating range, it indicates that the gyroscopic instruments may be unstable and inaccurate.

At ASAP Components, owned and operated by ASAP Semiconductor, we can help you find all the aircraft instruments you need, new or obsolete. For a quick and competitive quote, email us at or call us at 1-919-348-4040.

Read more »

It’s pretty easy to understand speed in a ground vehicle: it’s read right off of the speedometer and all the driver is required to do is follow the speed limit. However, this isn’t the case with aircraft— aerodynamics makes it a little more complicated. There are different types of airspeed and they are indicated airspeed (IAS), true airspeed (TAS), groundspeed (GS), calibrated airspeed (CAS), and equivalent airspeed (EAS).

There is a measurement device on the outside of an aircraft, called a pitot tube, that measures fluid flow velocity. This information is displayed on the IAS. A pilot can read the IAS right off of the airspeed indicator on the instrument panel in the cockpit.

The TAS is the speed of an aircraft relative to the air through which it is moving. Both altitude and temperature affect the TAS. Air density decreases with an increase in altitude because there is less air from above and pushing it down, and gravity is weaker. Air density also decreases as temperature increases, and vice versa. Because the molecules are further apart as a result of lower air density, the pitot tube receives less air molecules and has an inaccurate read; it will display a lower airspeed. TAS is generally 2% higher than IAS with every 1,000 ft gained in elevation. Pilot operating handbooks contain information on an individual aircraft’s true airspeed and fuel consumption at various altitudes, power settings, and temperatures. Some aircraft have an airspeed indicator equipped with a true airspeed ring. The pilot will input altitude and temperature information and will then be able to read the true airspeed on the indicator.

GS is the movement of an aircraft relative to the ground. This information is obtained by adding the tailwind from the TAS or subtracting the headwind from the TAS. Unlike the IAS or TAS, the GS does not determine when the aircraft will stall and does not influence aircraft performance. The wind speed may be obtained using navigation landmarks, radio-aided position location, inertial navigation system, or GPS. Ground speed radar can also be used to measure it directly.

CAS is the IAS corrected for instrumental and positional errors. At various airspeeds and different flap settings, the instruments may display an incorrect airspeed. This is more common at low airspeeds and high pitch attitudes. The CAS and TAS are the same at sea level when under International Standard Atmosphere (ISA) conditions; and if there is no wind, it is the same as the GS.

The EAS is the same as the TAS at sea level under ISA standards. The difference between the CAS and EAS is negligible at lower altitudes. At higher altitudes and speeds, the CAS needs to be corrected for the compressibility of air.

At ASAP Components, owned and operated by ASAP Semiconductor, we can help you find all the cockpit parts you need, new or obsolete. For a quick and competitive quote, email us at or call us at 1-919-348-4040

Read more »

We often take it for granted, but airplanes are truly one of the most impressive advancements in engineering history. From the Wright Brothers’ first plane made primarily of spruce wood to Airbus’s massive double-deck A380, airplanes have changed quite a bit — especially when you compare the simple design of the Wright Flyer to the double-deck, wide-body, four-engine design of the A380, a plane so massive that it took 1,500 companies from 30 countries to manufacture it’s 4 million individual parts. And yet, despite the obvious difference between the Wright Flyer and the A380, some things haven’t really changed: the basic shape of an airplane. Whether you’re flying in a massive Airbus A380, a regular Boeing 737, or an antique WWII fighter plane, there’s the same basic five sections: the fuselage, wings, engines, cockpit, and landing gear.

  • The fuselage is the main body of the plane that connects almost all of the other sections into a balanced symmetrical unit. This is where the passengers sit, and the cargo is held.
  • The wings protrude from both sides of the fuselage. They work with the stabilizers and integral flight-control surfaces like the flaps, ailerons, rudder, slats, and spoilers to form and change the airfoil such that the pilot can fly the airplane.
  • The engines are mounted either to the wings or to the rear sides of the fuselage. They propel airplanes to gather speed to take off, gain altitude, and maintain altitude and velocity while cruising.
  • At the front is the cockpit, where the pilots sit and fly the airplane. Modern cockpits include many different flight instruments that provide navigational, operational, safety, and communications information to the crew in real time.
  • And at the bottom of the fuselage, is the retractable landing gear. The landing gear has a front gear strut with two side-by-side wheels and two to four bogeys with two to six wheels each; each wheel has hydraulic disc brakes.

ASAP Components, owned and operated by ASAP Semiconductor, is a premier distributor of aircraft parts, NSNs, and board level components. We offer high-quality parts with the shortest lead times and the fastest shipping times in the industry. If you’re interested in a quote or more information about aircraft parts, visit us at, or call us at +1-919-348-4040.

Read more »

Flying and being thousands of feet in the air can be a thrilling experience. Well, maybe. For a lot of people, the excitement wears out really quick. Especially if you’re on an airplane with no broadband service. At that point, what do you do? Generally, you either sleep or try to look out the window. But, usually, the view isn’t great, and it’s obstructed because instead of square like your car, it’s round. Have you ever wondered why?

In 1949, de Havilland Comet, the world’s first commercial jetliner, flew its first flight. The idea was to revolutionize air travel with high speeds and less travel time. But, two fatal disasters in 1954 revealed major design flaws, namely the plane’s ability to withstand stress.

As a jetliner, the Comet flew at high altitudes to reduce flying costs. Higher altitudes mean lower air density and lower drag, which in turn means reduced load on the engines. But, because higher altitude also means lower air pressure, there’s a point where the cabin pressure is greater than the outside pressure of the plane. This means that the fuselage parts, or body of the plane, will expand slightly, and human passengers will feel the pressure difference. To combat that, the cabins are pressurized for normal human body functioning, and the cabin is made cylindrical so that changes in pressure are reduced and the stresses are dispersed equally. However, as the Comet showed in the 50’s, square windows don’t allow for that.

Square windows cause stresses to form at the edges. Instead of dispersing equally around the cabin, they concentrate at the window. And if left unchecked, these stresses can cause cracks and break the airplane open. On the other hand, round windows don’t restrict stress flow, and stress lines flow smoothly around it. Which is why, ever since the discovery in the 1950’s, aircraft manufacturers have used rounded window designs.

The next time you look out of an airplane window, you can rest assured that your flight will be swift and safe. At ASAP Components, owned and operated by ASAP Semiconductor, we want to make sure that you fly safe and sound. As a premier distributor of aviation and aircraft parts and components, we make sure that we only offer the highest quality parts. For a quick quote or to learn more, visit us at or call us at +1-919-348-4040.

Read more »

If anyone has ever seen the inside a cockpit of an aircraft, it may seem overwhelming to most.  Some may even see it as complicated and even hard to use.  Just like a car, an aircraft has instruments, but just different types to help guide the plane.  In a car, one might see the speedometer, to see how fast the vehicle is traveling.  In addition, there is the fuel indicator, to see how much gas the car has left before stopping at a gas station.  Also, there is the odometer, to see how far the car has driven-the odometer also helps with scheduling routine maintenance services. 

Since an aircraft has a much more difficult task than a car or motorcycle-flying an aerial vehicle requires different instruments. There are 6 basic instruments that are integral to help fly and guide the aircraft. 

  • The first one is attitude indicator, which basically shows the aircraft’s balance in relation to the horizon.  If the line in the attitude indicator is not balanced, that may imply the aircraft is leaning left, right, etc, and the pilot may need to make a correction.

                 attitude indicator

  • The next is the airspeed indicator to help show how fast the aircraft is traveling, this may be used to see how long it would take to get from point A to point B.  

                airspeed indicator

  • After that is the altimeter, to see how high the aircraft is above median sea level (MSL). 

                airspeed indicator

  • The 4th instrument is the turn coordinator to help determine the quality of the bank. 

                turn coordinator

  • The 5th instrument is the heading indicator, which is similar to a compass, to help see which direction the plane is going.

                 heading indicator

                 vertical speed indicator

ASAP Components, owned and operated by ASAP Semiconductor, should always be your first and only stop for aircraft instrument parts and airspeed indicator parts. ASAP Components is also the premier supplier of instrument parts for aircrafts and airspeed indicator parts, whether new, old or hard to find, they can help you locate it. ASAP Components has a wide selection of parts to choose from and is fully equipped with a friendly staff, so you can always find what you’re looking for, at all hours of the day. If you’re interested in obtaining a quote, contact the sales department at or call +1-919-348-4040.

Read more »

Gulfstream’s G500 and G600 business jets set groundbreaking worldwide records when they flew from Shanghai to Honolulu, and then once more from Honolulu to Savannah, Georgia, where Gulfstream is headquartered.  The G500 set eight city-pair records in its class on its own, earlier this year; although the records have already been set, they have yet to be verified by the National Aeronautic Association.

Gulfstream’s G500 can carry 19 passengers, sleep eight, and completed its journey from Shanghai to Honolulu in 8 hours and 34 minutes, travelling on average at Mach 0.90; in its second trip, it completed the flight in 7 hours and 44 minutes.  In contrast, the G600 can carry up to 19 passengers, sleep nine, and is powered by Pratt & Whitney’s Canada PW815GA engine.  The G600 has an advanced wing design that is as much as 23% more efficient than competing aircrafts in its class.  The G600 completed the Shanghai-to-Honolulu trip only one minute slower than the G500, travelling at the same Mach 0.90 speed.

After recent test flights exceeded the company’s expectations, Gulfstream extended the G500 and G600 flight ranges.  The G500 has a range of 5,200-nautical miles at Mach 0.85 and 4,400-nautical miles at Mach 0.90.  The G600 now has a 6,500-nautical mile range at Mach 0.85 and a 5,100-nautical mile range at Mach 0.90.

Gulfstream’s President Mark Burns stated that their customers are accustomed to “flying practically anywhere in the world at record speeds” and that the G500 and G600 are on par with their highest performing aircraft, the G650ER.

ASAP Components is an online distributor of Aircraft parts, NSN parts, Fasteners and Bearing parts, Pratt & Whitney parts, Connector parts and Broad level Electronic components.  With a continuously increasing inventory, you can be sure ASAP Components will have everything you need and more.  ASAP Components will ensure all needs are addressed in a timely and professional manner.  ASAP Components is known for having hard to find and/or out of stock parts and can always help you find cost-effective solutions.  For a quote, reach out to the main office by phone: 919-348-4040 or by email:

Read more »

Recent Twitter Posts

ASAP Semiconductor's Certifications and Memberships

ASAP Semiconductor is a Americas Fastest Growing Private Company
ASA Member
FAA 0056 B Accredited
Cage Code 6RE77
SourceESB - Top 50 Electronic Distributors 2018
ISO 9001:2008 Certified Distributor
eCustoms Visual Compliance
D-U-N-S Number 069876325
AAA Rating with Business Consumer Alliance
Thank You for Visiting ASAP Components!

Before You Go, You Should Take a Look at Our Aviation Parts Catalog. Do you want a Competitive Quote for any NSN Part Number ASAP?

Request for Quote
 Get A Quote