British Airways A388 enroute on May 5th 2016, the square tyre
Last Update: June 3, 2016 / 13:51:05 GMT/Zulu time
The aft right outboard body tyre caused a lot of head scratching trying to explain how the stunning square shape of the damaged tyre came together (editorial note: the original of the photo does not exhibit any indication of photoshopping).
The AVH coverage even caused head scratching at Airbus, which the follwing "In Service Information" transmitted by Airbus to aircraft operators underlines:
Purpose of this Article:
This article aims at providing some explanations on a tire that was found with a square “shape” after landing.
The following picture included in an article issued by “The Aviation Herald” on the 8th of May 2016 entitled "The Square tire" raised many questions.
Both Bridgestone and Michelin who were consulted came to the same explanation:
1. The tire got an FOD damage or puncture that perforated the casing.
2. The tire leaked during the flight until low/zero pressure.
3. During descent, when aircraft reached a lower altitude, due to the fact that either the hole in the tire closed up (due to low pressure inside the tire) or because the size of the hole did not allow the tire pressure to increase as fast as the outside air pressure, the higher outside air pressure exerted an external force on the tire that compressed into this this strange square shape.
This is the same thing with an empty (or almost empty) plastic bottle that would be closed in altitude and that collapse during the descent due to higher ambient pressure.
Airbus is aware of a similar issue on a competitor’s aircraft. Once the tire was removed, it recovered its round shape.
It is to be highlighted that in the both cases, the tires landed fully deflated with no break up or disintegration.
We would like to remind that in such a configuration (landing with a tire fully deflated), the involved wheel and the adjacent one have to be replaced in accordance with the relevant AMM’s instructions.
The reasons for which the tire took this “square shape” are difficult to explain precisely. It is assumed this is connected to the changing stiffness of the belt plies structure, especially as the sidewalls are compressed inwards. A square seems to be an optimum shape.
It must be highlighted that this type of event is relatively uncommon and that in most of the cases the tire will be destroyed during landing due to the pressure loss.
This article is published under license from Avherald.com. © of text by Avherald.com.
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