Bearings and bushings are used in a multitude of applications from complex aerospace machinery to simple clocks. They are a small component, yet there are many different variations because each one supports different loads and performance. So, what exactly are they?
Bearings assist machinery in moving at high speeds while reducing friction, stress, and wear. They are typically used to support rotating shafts in machines. On the other hand, a bushing is an independent plain bearing that supports a shaft; it allows relative motion by sliding instead of rolling. Unlike bearings, bushings don’t have multiple components.
Most bearings support a rotating shaft in machinery. They allow movement between components and provide contact between them, such as balls or rollers, which reduce friction. There are two general classifications: journal bearings and thrust bearings. Journal bearings support loads that act at right angles to the axes while thrust bearings support loads that act parallel to the axis. Within these classifications, there are many subcategories, and each is used to support different loads.
Bushings provide low friction motion and reduce power consumption, noise, and wear. They are metal tubes that are typically made from a bronze powder and are self-lubricating. The way that the bronze powder is compressed allows small pores to remain. They are saturated with oil, which seeps into the pores. When the bushing contacts a shaft, it deposits a thin film of lubricating oil. Bushings are often cheaper than ball bearings and can be used on both hardened and non-hardened shafts, while the ball bearing can only be used on hardened shafts. The disadvantages of using a bushing are that they can move in a jerking motion and they may not fit properly, leading to faster wear and tear of the machinery.
The term, glass cockpit, sounds like a follow up to The Glass Menagerie, but it’s really just a souped up term to describe the large glass displays that help pilots monitor their avionics while in flight. Also known as flight management systems (FMS), the screens provide critical details to the cockpit including flight info, cautions and warnings, and procedural steps. Most modern aircraft are equipped with avionics screens of some sort, also referred to as a technically enhanced cockpit. Alerting systems are one of the valuable components of avionics that utilize the visual aid of the glass cockpit.
An alerting system helps identify malfunctions and errors in the mechanics and avionics of an aircraft. Cockpit alerting systems act as a safeguard for any failures or complications that installed monitors might have missed. If there is a problem within the operation of an aircraft, the user interface of these systems will show two specific types of alerts to the pilot— a cautionary alert or a warning alert.
A cautionary alert is for any error that is not an immediate threat to flight progress but may become an issue in the future. Reminders to replace components are one example of the notification a caution might entail.
A warning alert is provided by the alerting system whenever a malfunction is an immediate threat to an aircraft’s ability to complete its current flight cycle. Alerts of this nature must be addressed with priority because they can indicate anything from engine failure to overheating electronics.
Alerting systems provide a comprehensive overview of an aircraft moment to moment. In a crisis, the information provided by alerting system devices can help a pilot make focused, informed decisions in critical situations. The systems can also help streamline aircraft maintenance by providing reminders for maintenance checks or necessary parts replacements.
Despite the many benefits of an alerting system, there are a few downfalls. As an electronically powered unit, the system is vulnerable to failure, and/or errors itself. A pilot should remain sensitive to the possibility of this sort of problem, though they are usually rare. The ability to cross reference information provided by avionics, paired with a thorough aviation background, may help in situations where the automated alerting system cannot. Fuel monitoring and weather navigation skills are two examples of expertise that a pilot should stay abreast of in case of alert system failure.
Unfortunately, even though it would make the hydraulic system stronger and more reliable, you can’t just weld a hydraulic system together. Instead, you have to use fitting and flanges, some of the most useful components of a hydraulic system. But, with so many different options to choose from, it’s important to know the difference in order to determine which is best for your needs.
Fittings are pieces of hardware that seal fluid within a hydraulic system by tightening threads between mating pairs, forcing them to form a high-pressure seal. There are two types of fittings, all-metal and O-rings.
All-metal fittings are those that utilize metal-to-metal contact in order to create a seal. And there are two types of all-metal fittings, pipe-fittings and flare-fittings. Pipe-fittings are cylindrical and prone to leakage and loosening due to being torque-sensitive. They’re also sensitive to temperature and vibration. Flare-fittings are better, generally used with tubing, making them more economical and able to withstand a wider temperature range.
O-rings contain pressurized fluid by compressing an elastomeric seal. They’re rubber-to-metal connectors, so they don’t distort anything, making them easier to tighten. But, they’re expensive and not interchangeable nor reusable.
Flanges are external or internal ridges or rims, used for strength of attachment to another object. Flanges are more suited for mobile parts and components. They can withstand a lot of shock and vibrations and have high pressure capabilities. They’re quick to assemble and offer a lot of flexibility between the hose and tube, offering ease of connection.
Either way, fitting or flange, it’s important to remember them with your regularly scheduled maintenance and repairs. They are great for hydraulic systems, but they’re no use once they’re old and damaged.
In order to secure the aircraft engine to the airframe or fuselage and evenly distribute the stresses and vibrations caused by the engine, we use engine mounts. Engine mounts are lightweight steel tubes welded together to form strong and stable structures to house aircraft engines. Aircraft engines of the same type or manufacturer will often use the same engine mounts. However, you can choose to weld your own instead of buying a pre-made one. Here are some shapes to consider.
Conical mounts are the easiest to fabricate, with four attach points to affix the engine and another four points to bolt the mount to the firewall. The mount points are parallel to the firewall, so there are no awkward angles. However, the vibrations and engine torque are not muffled, they’re transmitted through the frame.
Dynafocal mounts are more ideal because they cushion the vibrations and movements of the aircraft engine. However they’re more difficult and expensive to build and install. Dynafocal mounts also have four attach points, but they’re configured in the shape of a ring and focused at an angle towards the engine’s center of gravity. As a result, during welding, this angle must be held in perfect alignment or else the bolts won’t fit during engine installation.
Bed mounts are a little different. They have four points under the crankcase and then hang onto the firewall. They’re typically used on certain diesel engines.
Another thing to consider is the shock mount. The engine mount doesn’t dampen vibrations much on its own. Shock mounts, stiff rubber pieces of varying thickness and strength, are used in between the engine and mount in order to absorb the vibrations.
When welding your mount, it’s important that you know what you’re doing. You need to get all the alignments right, weld perfectly, and be able to install your mount properly. Some aircraft manufacturers will have installation kits including a mount for the engines they sell, which can be a lot easier to use than it is to weld your own. It pays to do your research and know what you’re doing.
At Aerospace Exchange, owned and operated by ASAP Semiconductor, we want to make sure that your aircraft is running at full capacity, so we stock up on everything you’d need, from materials to fabricate your own mount to pre-made mounts and installation kits. Visit us at www.aerospaceexchange.com to get started.
Lubrication, of any engine, is vital to its effective functioning and longevity. Without proper engine lubrication, you risk engine malfunctions and extreme wear and tear. This holds especially true to aircraft engines. Other functions of lubricants are cleaning, cooling, sealing, and fighting corrosion and rust that could plague the engine if left unused or untreated for prolonged periods of time. Lubricants’ amazing ability to keep engines clean is a major benefit. While the lubricant keeps the engine clean, it also maximizes efficiency of the engine to make sure you’re getting the maximum output your engine is capable of.
Lubricants also keep the engine cool. As the many parts of an engine are constantly moving and touching, they generate friction and therefore heat, which can raise the temperature of the engine to dangerous levels. The lubricant limits friction between the moving parts to keep the engine running cool and efficiently. This being said, engine lubricant is vital to the operations and moving parts of an engine. Without it, the engine becomes dangerous and not fit to fly.
Engine lubricant also acts as a seal in the space between the rings and the cylinder walls. The lubricant used in an engine can be used on and around seals in parts such as the crankshaft, protecting and retaining the seal. This being said, it’s important to know the properties of the lubricant that you need. If it’s not thick enough, it can put too much pressure on the seal and render the engine useless. If the formula is wrong, the seal could be corroded instead of protected. Properties are mixed film, dynamic, hydrodynamic, and electrohydrodynamic. Be sure to have the correct properties to avoid a potential malfunction.
A great extent of aircraft equipped with reciprocating engines maneuver an engine mount construction made of welded steel tubing. The mount is assembled in one or multiple sections that include the engine mount ring, bracing members (V-struts), and fittings for linking the mount to the wing nacelle.
The engine mounts are typically connected with the aircraft by particular heat – treated steel bolts. The significance of utilizing these particular bolts can be promptly admired, since they solitarily hold the complete weight of, and withstand all, the pressure enforced by the engine and propeller in flight. The superior bolts carry the weight of the engine while the aircraft is on the ground, but when the aircraft is flying another pressure is added. This pressure is torsional and impacts all bolts, not just the superior ones.
The portion of an engine mount where the engine is connected is known as the engine mount ring. It is typically created of steel tubing having a bigger diameter than the rest of the mount anatomy. It is ring shaped so that it can encircle the engine, which is close to the point of balance for the engine. The engine is generally attached mount by dynafocal mounts, secured to the engine at the point of equilibrium forward of the mount ring.
As aircraft engine turned to be manufactured in larger size and provide more power, some technique was required to assimilate their vibration. Alternative categories of mounting machines are also used to fix the divergent engines to their mount rings. This request conducted the development of the rubber and steel engine suspension components named shock mounts. This combination allows cramped engine motion in all directions.
In regard to airplanes, a tailwheel aircraft or a taildagger alludes to the position of the landing gear on an airplane. An aircraft with a tailwheel, which can also be identified as a conventional gear, is designed with the aircrafts two main landing gears set towards the front of the airplane’s center of gravity. It can also be set at the front of the aircraft, where a single “tailwheel” is in the back of the airplane to support the airplane’s tail.
The word “conventional” can be difficult to fully understand, although in present times, it is more common to see tricycle gears on light aircraft rather than the tailwheel style. Nonetheless, the word “conventional” (which derived from the detail that most airplanes years ago were designed with a tailwheel gear configuration) suggests that the airplane has been design with a tailwheel rather than a tricycle gear. Aircrafts that are designed with tricycle landing gears, in which the two main landing gear are placed behind the center of gravity while the nose gear supports the nose in the front of the aircraft, is the more common gear seen in light aircraft today.
Tailwheel aircraft are often seen to be more challenging and even more hazardous to fly than airplanes designed with a tricycle landing gear. Due to the position of the center of gravity, which is located at the back of the main gear, ground operations such as landing can be more difficult in a tailwheel airplane. Because the nose sits higher in a tailwheel aircraft than a tricycle gear airplane, the forward visibility of the pilot is lowered during ground operations (ie. landing). It is more difficult to navigate without the ability to see directly in front of you, which is why in most cases, pilots of tailwheel aircrafts will do S-turns during navigation.
“Taildaggers” or “tailwheels” certainly also have benefits. Because of the “nose-high attitude” on the ground, the propellers on the aircraft have more clearance from the ground, which makes them more suitable for grass or dirt runways. These aircrafts are usually designed and configured for slower flights, which allows for easier landings on short runways.
ATR, a Franco-Italian aircraft manufacturer and a parent company to Leonardo DRS, a defense contractor, recently announced its rejection of the 100-seat turboprop. Leonardo has been working for several years with airbus on the plan however, the agreement was taking too long so Leonardo opted out. Leonardo will now invest all its resources into its existing ATR 42 and 72 models.
Leonardo was trying to out-do bombardier who recently released the world’s only 90-seat turboprop. Leonardo currently has a detailed plan to restore growth within their helicopter division after it had several difficulties and misfortunes in 2017. Although this partnership did not prove to work out Leonardo states that it is still a step in the right direction to restore the helicopter division.
ATR owns over 75% of the worlds turboprop market and even with its recent order of 42 and 72 models, there is still room for significant growth. The turboprop is ATR’s current focus and they are going to do all they can to make it successful.
The new turboprop was denied because it would need to have an entire new airframe created. Leonardo is not happy about ATR’s decision and has even threatened to take on an entire new partner to get the job done. Leonardo’s enthusiasm is of no surprise as the company has always strived for top manufacturing and financial performance.
For now, Leonardo’s focus is for steady yet sustainable growth over the next few years. Leonardo will be looking for more opportunities to expand their business and to put more focus on bigger projects so that they can start coming out on top.
Honeywell has recently joined forces with Logix Aero, a rental dealership offering custom financing solutions to offer rental auxiliary power units to airbus customers. These units will be rented to individuals whom posses Airbus A330 and A340 Aircrafts. The need for this type of service has been long awaited and customers are highly looking forward to these rental deals as they will provide short and long-term solutions.
These rentals will allow for customers to utilize the units without having a contracted obligation to repair the unit or the unit core. The program also allows customers to use the maintenance service of their choice for the auxiliary power units which will reduce costs for upkeep and repair and will make downtime pass quicker.
Customers will now be able to choose the amount of time they would like to rent, a perk that addresses their operational and business needs. Once the units are no longer needed they will be dissembled from the aircraft and returned to Logix Aero to be rented to the next customer. Unscheduled auxiliary power unit maintenance or failure can lead to flight cancellations and downtime, a financial hit that no airline wants to take.
Although these units won’t solve the problem of a failed auxiliary power units it will allow for a temporary fix so that airlines can continue to fly and ensure customer satisfaction. Honeywell is the world largest Manufacturer of auxiliary power units, many aircrafts ranging from commercial, executive and military platforms. The units are primarily used to power aircrafts during ground operations such as main engine starting, ground operations and aircraft conditioning.
Four engine jets including the Boeing 747 and the Airbus A380 put Qantas, Korean Air, and Asian Airlines at the bottom of the airline fuel efficiency ranking of transpacific flights. While Hainan Airlines and All Nippon Airways (ANA) are said to be the most fuel efficient with 36 passenger kilometers per liter of fuel. This claim was made by the International Council on Clean Transportation (ICCT) in the white paper in 2016. These low fuel uses are accomplished in very different ways. Hainan Airlines is an extremely advanced fleet with 81% of its available seats were on the Boeing 787 Dreamliner aircraft. While the All Nippon Airways (ANA) have a higher amount of burning fuel but carried more cargo.
Qantas was at the bottom of the ranking with only 22 passenger kilometers per liter of fuel due to it being the most fuel intensive with very low load capabilities with both cargo and passengers. The average passenger kilometers per liter of fuel within airlines is 31. Even lower than Qantas, was China Southern Airlines, China Eastern Airlines, Cathay Pacific, Philippine Airlines, and Singapore Airlines with 20 passenger kilometers per liter of fuel.
The International Council on Clean Transportation’s (ICCT’s) aviation program director, Dan Rutherford found that the fuel burn per passenger rises with the size and weight of the aircraft, which is why the 747s and A380s look so bad in this report. Qantas is looking to replace the 747s with the 787-9s that have the twin engine controls. The most recent twin-engine planes with a wider body meet the requirements for a transpacific flight but with much lower fuel burn.
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