Regan Brown
Aviation gasoline, commonly known as avgas, is a type of fuel used to power piston-engine aircraft. 100LL, which stands for 100 low lead, is one of the most common types of avgas. The price of 100LL aviation fuel is a concern for pilots and aircraft operators due to its potential impact on the overall cost of aviation operations. While the exact price of 100LL aviation fuel can vary depending on various factors, it is crucial for those in the aviation industry to stay updated with the current prices to make informed decisions regarding fuel procurement and flight planning.
| Characteristics | Values |
|---|---|
| Aviation gasoline commonly known as | Avgas |
| Avgas is fuel for | piston-engine powered aircraft |
| Avgas is a | high-octane fuel |
| Avgas is specially formulated to | meet the requirements of aircraft engines |
| Avgas is a | lower-lead version of Aviation Gasoline 100 |
| Avgas is dyed | blue |
| Avgas weighs | 6.02 pounds per gallon (0.72 kg/L) at STP |
| Avgas is harmful or fatal | if swallowed |
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What You'll Learn
100LL aviation fuel weighs approximately 6.02 pounds per gallon at standard temperature and pressure
100LL, or 100 low lead, is a type of aviation fuel used to power piston-engine aircraft. It is a high-octane fuel that is specially formulated to meet the requirements of aircraft engines. The weight of 100LL fuel depends on several factors, including temperature, pressure, and altitude. At higher temperatures, 100LL fuel expands and becomes less dense, causing a gallon of the fuel to weigh less. Conversely, at lower temperatures, the fuel contracts and becomes denser, resulting in a higher weight per gallon. Similarly, at higher altitudes, the lower pressure causes the fuel to expand and become less dense. Due to these variations, pilots must carefully consider the weight of 100LL fuel when calculating their aircraft's weight and balance. The proper distribution of fuel throughout the aircraft is crucial for ensuring a safe and efficient flight.
At standard temperature and pressure (STP), which is defined as 15°C (59°F) and 1 atmosphere of pressure, 100LL aviation fuel weighs approximately 6.02 pounds per gallon (0.72 kg/L). This weight value is essential for pilots when calculating the weight and balance characteristics of their aircraft. By understanding the weight of the fuel, pilots can ensure that their aircraft is properly loaded and fuelled for safe and efficient flight operations.
The colour of 100LL fuel is typically dyed blue, making it easily distinguishable from other types of fuel. This distinct colour helps pilots and ground crew quickly identify any leaks or spills. However, despite the visual aid, it is crucial to verify the type of fuel being used before adding it to an aircraft to ensure the safety of all involved.
The future availability of 100LL fuel is uncertain due to concerns about its environmental impact and lead content. There have been calls for the aviation industry to transition to alternative fuel types. In 2008, National Air Transportation Association president Jim Coyne predicted that the environmental impact of aviation fuel would become a significant issue, leading to the phasing out of 100LL fuel. As a result, companies like Teledyne Continental Motors (TCM) have explored the development of diesel engines and more sustainable aviation fuel options.
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It is dyed blue to distinguish it from other types of fuel
100LL, which stands for "100 low lead," is a type of aviation gasoline, or avgas, commonly used to power piston-engine aircraft. It is dyed blue to distinguish it from other types of fuel, such as diesel and kerosene. This makes it easy for pilots and ground crews to identify and also serves as a safety feature, as it makes leaks or spills noticeable.
The blue dye is added to the fuel during the manufacturing process. While 100LL is typically blue, this may not always be the case. In some instances, the dye may fade or be removed due to exposure to sunlight or other environmental factors. Therefore, pilots and ground crews must always verify the type of fuel before adding it to an aircraft.
The colour of 100LL can vary from light blue to dark blue. This variation in colour intensity may be due to a higher concentration of dye, evaporation of fuel, or the mixing of old and new fuel. In some cases, a leak may cause the fuel to evaporate, leaving behind a stronger concentration of dye.
It is important to note that the use of 100LL is being phased out due to environmental concerns and health risks associated with its lead content. The aviation industry is transitioning to unleaded fuels, such as UL91 and UL94, which are clearer in colour and do not contain dyes. This shift towards cleaner and more sustainable fuel options is a positive development, addressing the industry's carbon footprint and promoting a safer aviation future.
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It is a lower-lead version of Aviation Gasoline 100
Aviation Gasoline 100LL, also known as Avgas or AVGAS 100LL, is a lower-lead version of Aviation Gasoline 100. It is a blue-dyed aviation fuel with a high octane number, specially designed for aircraft with spark-ignition piston engines. The LL in 100LL stands for "low lead", indicating that it contains less lead than Aviation Gasoline 100. The maximum lead content in Aviation Gasoline 100LL is 0.56g of lead per litre.
The octane number of an aviation fuel measures its ability to resist compression without detonating, which is a critical property for aircraft engines. The high octane rating of AVGAS 100LL allows it to be used in engines with higher compression ratios without detonation, preventing potential damage to the combustion chamber. This fuel is particularly suitable for piston engine-powered aircraft, including private, commercial, and military training aircraft.
AVGAS 100LL complies with international standards and specifications and is widely available in airports globally. It is approved by major aircraft engine manufacturers and can be used in aircraft engines originally designed for lower-octane grades such as 80/87, 100/130, and the discontinued 91/98. However, automotive gasoline is not a recommended replacement for AVGAS 100LL, as properties critical to aviation use, such as vapor pressure and cleanliness, may not be adequately controlled during automotive fuel manufacture and handling.
While AVGAS 100LL represents a reduction in lead content compared to Aviation Gasoline 100, there are ongoing efforts to further reduce or eliminate the use of lead in aviation gasoline. The environmental impact of aviation fuel has gained attention, and the phase-out of 100LL due to its lead content is expected. Unleaded alternatives, such as UL91 and UL94, are being explored, but the aviation industry faces challenges in transitioning to lower-octane fuels.
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It is used in piston-engine aircraft
Aviation gasoline, or Avgas, is a highly refined product specifically designed to meet the performance requirements of aircraft engines. It is used in piston-engine aircraft, which include brands such as Cessna, Piper, and Beechcraft. Piston-engine aircraft are commonly used for recreational flying, flight training, agriculture, and light cargo transport. Some piston-engine brands that utilize 100LL include Robinson helicopters and certain military drones.
Avgas is distinguished from conventional gasoline (or petrol) used in motor vehicles, which is termed mogas (motor gasoline) in an aviation context. Unlike motor gasoline, which has been formulated without lead since the 1970s to facilitate the use of catalytic converters for pollution reduction, the most commonly used grades of avgas still contain tetraethyl lead. Tetraethyl lead is a toxic lead-containing additive that aids in the lubrication of the engine, increases octane rating, and prevents engine knocking (spark-knock).
100LL is the most popular type of avgas used for piston-engine aircraft. The name refers to the 100-octane level and "low lead," as 100LL is combined with lead to prevent engine damage. 100LL is dyed blue to differentiate it from other avgas products. The octane number measures the fuel's ability to resist compression without detonating, which is the most important property for this kind of fuel.
There are ongoing efforts to reduce or eliminate the use of lead in aviation gasoline due to environmental and health concerns. Unleaded fuel that satisfies the critical piston engines in the existing aircraft fleet is challenging to develop because the antiknock properties of tetraethyl lead are unique. However, several alternative fuels are being tested, including unleaded avgas formulations, biofuels, and UL91 and UL94.
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It is not widely available in the US
Avgas (aviation gasoline) is an aviation fuel used in aircraft with spark-ignited internal combustion engines. The most commonly used grades of avgas contain tetraethyl lead, a toxic additive used to aid in lubrication and increase the octane rating. 100LL (pronounced "one hundred low lead") is a grade of avgas that contains a maximum of half the tetraethyl lead found in 100/130 avgas.
While 100LL aviation fuel is available in over 50 countries worldwide, including the United States, its availability is limited and it is not widely accessible across the US. In November 2015, UL94, an unleaded aviation gasoline, was introduced as a secondary grade of fuel that meets the same specifications as 100LL, except for a lower motor octane number and decreased lead content. UL94 is available at dozens of airports in the United States and is designed as a drop-in replacement for aircraft with lower-octane-rated engines.
The limited availability of 100LL aviation fuel in the US is due to several factors. One reason is the environmental impact of leaded aviation fuel, which has led to efforts to reduce or eliminate the use of lead in aviation gasoline. In February 2008, Teledyne Continental Motors (TCM) expressed concerns about the future availability of 100LL and indicated that the aviation industry would likely be "forced out" of using it in the near future. The company announced that they would develop a line of diesel engines as an alternative.
Additionally, the 100LL phase-out has been recognized as a significant challenge for general aviation. 70% of 100LL fuel is used by 30% of aircraft in the general aviation fleet that cannot use alternative fuel types without substantial modifications to the engine and airframe. This has resulted in a pressing need to identify suitable replacement fuels that meet the performance and safety requirements of aviation engines.
The FAA and fuel companies are actively working on solutions to address the limited availability of 100LL. Swift Fuels, for example, has developed an unleaded fuel intended for "high-performance piston-powered aircraft," which is expected to be available before 2020. These efforts aim to provide alternative fuel options that are compatible with existing aircraft while also addressing environmental concerns and ensuring the safety and performance of aviation engines.
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Frequently asked questions
100LL stands for 100 low lead.
The cost of 100LL aviation fuel depends on various factors such as location and date. You can find the current prices for 100LL aviation fuel at U.S. airports and FBOs by region on GlobalAir.com.
At standard temperature and pressure (STP), 100LL aviation fuel weighs approximately 6.02 pounds per gallon (0.72 kg/L). However, the weight of 100LL aviation fuel can vary depending on the conditions in which it is stored and used. For example, at higher temperatures, 100LL aviation fuel expands and becomes less dense, resulting in a lower weight per gallon.
100LL aviation fuel is typically dyed blue to distinguish it from other types of fuel, such as diesel and kerosene. The blue colour also serves as a safety feature, making it easy to spot any leaks or spills during fueling or maintenance operations.
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