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added more info for clarification
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user14897
user14897

As mentioned there are two ways used for pushback: towbar and towbarless (TBL) push trucks.

There is a third way that is not as common: the Power Push Unit (PPU).

enter image description here
Source: airliners.net

Unlike the standard pushback process that uses a pushback truck and a towbar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear bogies. It pushes the aircraft backwards and the pilot steers the nose wheel based on the instructions of the PPU operator.

Based on one company, the way it works is via "pressure rollers [that] grip the tyres. Rotational friction forces drive the aircraft's wheels."

As mentioned there are two ways used for pushback: towbar and towbarless (TBL) push trucks.

There is a third way that is not as common: the Power Push Unit (PPU).

enter image description here
Source: airliners.net

Unlike the standard pushback process that uses a pushback truck and a towbar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear bogies. It pushes the aircraft backwards and the pilot steers the nose wheel based on the instructions of the PPU operator.

As mentioned there are two ways used for pushback: towbar and towbarless (TBL) push trucks.

There is a third way that is not as common: the Power Push Unit (PPU).

enter image description here
Source: airliners.net

Unlike the standard pushback process that uses a pushback truck and a towbar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear bogies. It pushes the aircraft backwards and the pilot steers the nose wheel based on the instructions of the PPU operator.

Based on one company, the way it works is via "pressure rollers [that] grip the tyres. Rotational friction forces drive the aircraft's wheels."

added photo; improved grammar/spelling
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user14897
user14897

As mentioned above there are two ways used for pushback: towbar and towbarless (TBL) push back by using a tow bar or tow braless pish trucks.

There is a third way but its not that common and rarely user it is not as common: the (PowerPower Push Unit (PPU).

enter image description here
UnlikeSource: airliners.net

Unlike the standard pushback process that uses a pushback truck and a tow bartowbar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear bogies. It pushes the aircraft backwards and the aircraft pilot is in charge of steering the aircraft withsteers the nose wheel, which can move freely. So basically based on the pilot has to allign him self by usinginstructions of the nose gearPPU operator.

As mentioned above there are two ways used for push back by using a tow bar or tow braless pish trucks.

There is a third way but its not that common and rarely user it is the (Power Push Unit). Unlike the standard pushback process that uses a pushback truck and a tow bar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear. It pushes the aircraft backwards and the aircraft pilot is in charge of steering the aircraft with the nose wheel, which can move freely. So basically the pilot has to allign him self by using the nose gear.

As mentioned there are two ways used for pushback: towbar and towbarless (TBL) push trucks.

There is a third way that is not as common: the Power Push Unit (PPU).

enter image description here
Source: airliners.net

Unlike the standard pushback process that uses a pushback truck and a towbar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear bogies. It pushes the aircraft backwards and the pilot steers the nose wheel based on the instructions of the PPU operator.

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Hmb
Hmb
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As mentioned above there are two ways used for push back by using a tow bar or tow braless pish trucks.

There is a third way but its not that common and rarely user it is the (Power Push Unit). Unlike the standard pushback process that uses a pushback truck and a tow bar attached to the nose wheel, the PPU is a remote controlled truck directly attached to one of the main landing gear. It pushes the aircraft backwards and the aircraft pilot is in charge of steering the aircraft with the nose wheel, which can move freely. So basically the pilot has to allign him self by using the nose gear.