Looking around the Michelin site on their aircraft tires was kind of interesting. I use to put bicycles together, and over the years in filling 10's of thousands of tires, a few inner tubes burst. Man is that loud. Sounds like a gun shot going off. I can only imagine what a tire at 340psi would sound like and the damage it would do. Could have easily been the boom people heard. It appears aircraft tires on the commerical planes are about 175psi. Here's a few interesting things I found.
-------- When required, reinflate tires to their specified operating pressure with a dry, commercial grade nitrogen of at least 97% purity. In some cases, nitrogen may not be available for adjusting tire inflation. When this occurs, clean dry air may be used as long as the oxygen content does not exceed 5% of the total tire volume. If the 5% oxygen limit is exceeded, the tire must be deflated and then reinflated with nitrogen to the specified operating pressure.
WARNING! In the event of excessive heat build-up in the tire/wheel assembly (example, locked brakes), hydrocarbons released by the tire may spontaneously ignite in the presence of oxygen. A tire filled with air can explode, causing injury to persons and damage to equipment.
--------- Effect of ambient temperature on gauge pressure Effect of Temperature Watch for severe changes in ambient temperature. Changes in temperature affect gauge pressure readings as follows: 1% change (increase) in inflation pressure reading for every 3°C/5°F change (increase) in temperature. The above charts are a helpful example of the change in inflation pressure readings as a result of a change in ambient temperature. For convenience, it is given in metric units and in customary units.
--------- Proper Inflation – Standard for Maintaining Pressure Level A “cold” tire is defined as a tire which has come to equilibrium with its operating environment (ambient temperature). While the actual (ambient) temperature of the “cold” tire will vary from location to location and from season to season, the operational inflation pressure (PN), as specified by the airframe manufacturer for each aircraft configuration, is necessary to carry the load of the aircraft. This pressure value is therefore needed regardless of the ambient temperature. For example, if PN = 12 bars / 175 psi, this is the pressure needed at any ambient temperature.
Note: Do not reduce the pressure of the “cold” tire subjected to frequent changes in ambient temperature. [Refer to P. 44 for additional guidance.]
Aircraft experiencing large ambient temperature differences between airports Large temperature differences place a special burden on aircraft operations. As can be seen in the chart above, large changes in ambient temperature will result in corresponding changes in gauge pressure. Aircraft flying long distances where a large (>30°C/54°F) decrease in ambient temperature will occur need to apply specific inflation maintenance procedures. One of two options should be selected in this situation:
In the event that pressure maintenance is not available at the destination airport, raise the operating inflation pressure (PN) by 1% for each 5° F / 3° C temperature drop relative to the departure airport to insure adequate inflation pressure in the assembly at the destination airport. Note: Do not exceed maximum rated loaded tire pressure.
or When pressure maintenance is available at the destination airport, check and readjust to operating inflation pressure (PN) prior to the next flight. In all other cases, maintain the inflation pressure per the standard recommendation.
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