Why are the tyres of aircrafts made of conducting rubber? 1. So that the charge accumulated on the aircraft in flight, by rubbing the air, can easily be transferred to ground on landing. 2. So that the charge accumulated due to the operation of various electronic equipments in the aircraft in flight can easily be transferred to ground on landing.
Understanding Aircraft Tyres and Static Charge
Aircraft fly through the air at high speeds. During flight, friction occurs between the aircraft's surface and the air, as well as any dust or particles present in the air. This friction can cause the aircraft to accumulate a significant amount of static electrical charge.
Why Static Charge Accumulates on Aircraft
The primary reason for charge accumulation on an aircraft during flight is triboelectric effect, which is the transfer of charge between two objects when they are rubbed together. As the aircraft moves through the atmosphere, friction with air molecules and particles causes electrons to be stripped from one surface and gained by another, resulting in a net positive or negative charge on the aircraft body.
The Role of Conducting Rubber Tyres
When an aircraft lands, it needs to safely discharge this accumulated static charge to the ground. If the tyres were made of insulating rubber, the charge would remain on the aircraft, potentially causing a large potential difference between the aircraft and the ground. This could lead to a sudden discharge (a spark) when a metal part of the aircraft, or even a person, makes contact with the ground. Such a spark could be dangerous, especially near fuel vapour.
Conducting rubber is specifically designed to have a lower electrical resistance than standard insulating rubber. This allows the static charge accumulated on the aircraft's body to flow through the tyres and into the ground relatively slowly and safely upon landing, thus preventing the build-up of a hazardous potential difference.
Analyzing the Given Statements
Let's look at the two statements provided in the question:
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Statement 1: So that the charge accumulated on the aircraft in flight, by rubbing the air, can easily be transferred to ground on landing.
This statement accurately describes the main function of conducting rubber tyres. Friction with air is a significant source of static charge accumulation on aircraft, and the tyres provide a path for this charge to dissipate to the ground upon landing.
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Statement 2: So that the charge accumulated due to the operation of various electronic equipments in the aircraft in flight can easily be transferred to ground on landing.
While electronic equipment can potentially contribute to some internal charge build-up or electromagnetic effects, the primary and most substantial source of static charge that the conducting tyres are designed to handle is the external charge accumulated from friction with the air during flight. Dissipating charge from electronic equipment operation is a less critical factor addressed by conducting tyres compared to dissipating the large static charge from air friction.
Based on the analysis, Statement 1 correctly identifies the main reason for using conducting rubber in aircraft tyres.
Conclusion on the Statements
Statement 1 explains the primary purpose: dissipating static charge from air friction. Statement 2 describes a less significant or secondary concern compared to the vast amount of charge built up externally. Therefore, Statement 1 is the key reason.
| Source | Significance for Tyre Conductivity | Explanation |
|---|---|---|
| Friction with Air (Triboelectric effect) | High | Primary cause of significant static charge build-up on the aircraft skin during flight. This charge needs to be safely grounded upon landing. |
| Operation of Electronic Equipment | Lower | May contribute to some electrical effects but is not the main source of the large static charge the conducting tyres are designed to discharge upon landing. |
Revision Table: Aircraft Tyre Conductivity
| Feature | Description |
|---|---|
| Material Type | Conducting Rubber (infused with conductive materials like carbon black) |
| Purpose | To allow accumulated static electricity to flow safely to the ground. |
| Main Source of Charge | Friction between aircraft and air/particles during flight. |
| Risk without Conductivity | Potential for dangerous spark upon landing due to large potential difference between aircraft and ground. |
Additional Information: Static Electricity in Aviation
Static electricity is a significant phenomenon in aviation. Besides friction with air, precipitation like rain, snow, or ice crystals can also cause charge accumulation. This charge can interfere with radio communications (causing static) or even lead to visible discharges from sharp points on the aircraft (like wingtips or antennas) called St. Elmo's Fire. Conducting parts, including conducting rubber tyres, static wicks (discharge wicks) on wingtips and tail, and bonding of metal parts, are all employed to manage and dissipate static electricity safely.
The conductivity of aircraft tyres is a critical safety feature ensuring that the aircraft is properly 'earthed' or 'grounded' the moment it makes contact with the runway surface during landing.
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