Another reason for the question: What causes tires to lose air pressure? is the alteration in temperature. Furthermore, the change in weather renders the pressure of newly acquired tires to drop. The air condenses when it’s chilly outside, and the pressure lowers more quickly.
Full Answer
How long does it take for an aircraft tire to lose air pressure?
In fact, an aircraft tire can lose up to 5 percent of its pressure in 24 hours and still be perfectly serviceable.
Why is it important to make sure your aircraft tires are properly inflated?
Making sure that the aircraft tires are properly inflated is a crucial part of preflight and routine service checks which can go a long way to maximizing tire utilization and minimizing risks to safe operations.
Why are aircraft tires important?
High inflation pressure and high deflection rates – 2.5 times greater than a car tire – allow relatively small tires to support the high loads of an aircraft. Because aircraft tires operate at such high extremes of pressure, load, and speed, their care and service is critically important.
What is the most important action an operator can take to prevent tire-related events?
The most important action an operator can take to prevent tire-related events is to maintain proper tire inflation pressure. Failure to keep aircraft tires properly inflated can lead to very serious consequences. The most serious of these is the structural failure of the tire.
Why do passenger car and truck tires operate continuously?
Additionally, the passenger car and truck tires are able to operate continuously because they reach thermal equilibrium while aircraft tires do not. An aircraft tire which taxis continuously at rated load and 40 mph will continue to heat up until the tire fails.
What is the recommended tire pressure for Michelin?
Michelin recommends always servicing the tires to the top of that range – 105 percent. If the pressure is found to be between 95 and 100 percent of operating pressure, service the tire to 105 percent; this is considered normal pressure loss. If it is between 90 and 95 percent, the pressure loss is no longer normal.
What happens if tire pressure is 90?
If the pressure is again found to be in the 90 to 95 percent range, remove the tire and troubleshoot the reason for the pressure loss. If the tire has operated at less than 90 percent of the targeted operating pressure, it is no longer serviceable and must be removed.
Why is it important to monitor air pressure on aircraft tires?
Since aircraft tires and tubes are primarily made of natural rubber, they can lose pressure over time. Incorrect tire pressure can lead to uneven wear, excess heat generation, and reduced traction. Aircraft tires are manufactured to extremely high standards.
Why is my tire out of balance?
That said, flat spots can cause the tire to be out of balance. If you experience shimmy during taxiing or gear vibration in flight, examine the tires for flat spots and consider tire replacement to eliminate balance issues as the cause. Next, take a close look at the bead area of the tire (where the tire meets the wheel rim).
Why do tires have flat spots?
Another common tire problem is flat spots on the tread—often caused by skidding or hydroplaning during landing. Generally, tires do not need to be replaced due to flat spots unless the wear exposes the tire fabric. That said, flat spots can cause the tire to be out of balance. If you experience shimmy during taxiing or gear vibration in flight, examine the tires for flat spots and consider tire replacement to eliminate balance issues as the cause.
How deep should a tire be to replace?
Any deep cuts extending more than half the width of a rib and deeper than 50 percent of the remaining tread depth are indications for tire replacement. Also, any bulges in the tread, sidewall, or bead area should be a reason to condemn the tire right away.
How to tell if a tire is overinflated?
Finally, examine the tread wear for evenness. If the tread is worn in the center, but not on the edges, the tire is probably over-inflated. On the other hand, if the tire shows much more wear on the edges, it’s probably under-inflated. Monitoring the air pressure of your tires is extremely important. Since aircraft tires and tubes are primarily made of natural rubber, they can lose pressure over time. Incorrect tire pressure can lead to uneven wear, excess heat generation, and reduced traction.
What causes a tire to crack?
Exposure to the sun and aging can also damage a tire. This is called weather checking and usually shows up as numerous small cracks in the sidewall and bead areas, but it can also occur right in the tread. As with cuts, cracks extending down to the plys of the tire should mandate tire replacement.
What should be a focal point during preflight inspections?
Your tires should be a focal point during your preflight inspections. It’s very important to verify that your tires are in excellent condition with frequent inspection, especially after difficult landings.
Why do tires lose air?
There really are only four reasons why tires lose air: 1. Osmosis of air through the tire casing can lead to a loss of 1 to 3 PSI per month, depending on the specific tire make and model. The type of compounds used in the manufacture of the tire can have a big impact on osmosis. The composition and gauge of the tire innerliner compound also plays ...
What happens when air pressure is set correctly?
When the proper air pressure is correctly set, tire removal miles, fuel economy and retreadability all are maximized. Air carries and supports vehicle loads; in a perfect world, depending on the specific load, the inflation pressure should be set accordingly. If a loaded tire is carrying 6,000 pounds when run on the steer position, ...
How long does it take to check tire pressure?
Checking the pressure of 18 tires with valve caps on one rig can take up to 15 minutes to complete.
What is the recommended tire pressure for a 295/75R22.5?
If a loaded tire is carrying 6,000 pounds when run on the steer position, then the recommended tire inflation is 110 PSI for the common 295/75R22.5 low profile tire size. Load-inflation tables state the designed tire pressure defined for given tire loads. These tables are readily available on all the tire companies’ websites.
Should tire pressure be changed every time load changes?
Since it is totally impractical to change tire pressures every time the trailer load changes, the recommended tire pressure setting must be based on the worst case load scenario. Even though the average load may be significantly lower than the worst case load, it still is very important to set the pressure based on that worst case load scenario.
Can over tightening valve cores cause loss of air?
Over-tightening valve cores can lead to loss of air. There actually is a specification of 4 inches per pound of torque on a tire valve core. Valve core pre-set torque wrenches are available through tire supply companies. Advertisement. 4.
Why do tyres lose pressure?
The most common reasons for tyre pressure loss: Natural penetration of pressurised air through tyre components, Damaged rim (scratches, cracks, beads, rust etc.), Defective valve or valve insert, Incorrect seating of the valve in the rim opening,
Why is it important to maintain the correct tyre pressure?
Proper operation of the tyre depends on many factors and one of them is having the correct tyre pressure, kept at the level recommended by the manufacturer. The following factors help to maintain optimum tyre pressure:
Why is it important to drive on properly inflated tyres?
It’s crucial to drive on properly inflated tyres and regularly check if the tyre pressure is correct. Tyre pressure loss causes more friction between the road and the tyre, which may end up in overheating or even a nasty blowout. Driving on under-inflated tyres affects not only your safety but also your car’s fuel consumption so regular pressure ...
When did the European Union start requiring tyre pressure sensors?
From November 1st, 2014, every new car sold in the European Union must be equipped with a system that automatically checks the tyre pressure. Seasonal change of tyres in a car equipped with such sensors differs from the process of replacing tyres without sensors. It requires special equipment.
Where to check tyre pressure?
If you're wondering what pressure should be maintained in your tyres, read the manufacturer's manual or check the information on inner side of the fuel filler flap. This is the place where the key tyre values are specified, including: pressure level or tyre size recommended by the manufacturer.
What is a TPMs system?
Automatic pressure sensors from the Tyre-Pressure Monitoring System (TPMS) inform the driver about the tyre pressure level and alert the driver when it drops below a safe level . There are two types of this system. The indirect system is standard in cars of medium and economic class and the direct system is installed in high-end cars and transfers real time data.
What is an aircraft tire?
The modern aircraft tire is a highly- engineered composite structure designed to carry heavy loads at high speeds in the smallest and lightest configuration practical.
Why is correct mounting and demounting of aircraft tires and tubes important?
Correct mounting and demounting of aircraft tires and tubes are essential for maximum safety and economy. It is a specialized job that should be done only by fully trained persons with the proper tools and with careful attention to specific instructions and established procedures.
Why should all tires be inflated equally?
To prevent one tire on a gear from carrying extra load, all tires on a single gear should be inflated equally. The mate tire(s) will share the load, allowing individual tires to run underinflated or overloaded if pressures are unequal, because all tires on the gear will deflect identically.
Why are Goodyear tires inspected?
In Goodyear’s manufacturing facilities, stringent finished tire inspection is performed to help ensure that Good year tires are shipped to the customer in first class condition. Because of the characteristics of rubber, special care is taken to inspect shipping containers, pallets and trucks for obvious conditions that could cause damage to these tires. However, aircraft tires may be damaged during shipping or handling after the tires leave the control of our facilities and prior to entering service. Damage of this nature is the responsibility of the freight carrier and needs to be handled between the receiving facility and the freight handler as soon as possible after receipt of the tire(s). It should be kept in mind that some of this damage can be so slight that it escapes incoming inspection procedures and is noticed later or after the tire is mounted on the wheel assembly and inflated.
When should tires be removed?
Tires should be removed when tread has worn to the base of any groove at any spot, or up to 1/8 of the tire circumference.
Where are tubeless tires vents?
All tubeless tires have been vented in the lower sidewall area during the tire manufacturing process. These vents prevent separation by relieving pressure buildup in the casing plies and under the sidewall rubber. These vent holes (marked by green dots) will not cause undue pressure loss and do not close. Covering them with water or a soap solution may show an intermittent bubbling, which is normal.
What is radial tire?
Radial aircraft tires feature a flexible casing which is constructed of rubber-coated ply cords which extend around the beads and are substantially at 90° to the centerline of the tread. The casing is stabilized by an essentially inextensible circumferential belt. This diagram contains all the potential components of a radial tire. Due to design parameters, your tire may or may not contain all pictured components.