Pushback explained: how aircraft get backed out of the parking position

The doors are closed, the jet bridge pulls back, the red beacon on the fuselage comes on – and then a full-sized jet starts moving backward, pushed by a flat vehicle that looks almost like a toy next to it. The pushback is one of those moments you see dozens of times a day at any observation deck and yet hardly anyone can explain in detail. This guide shows you why aircraft are pushed backward out of the parking position, which tugs exist, what is agreed between the cockpit and the ground crew and how to tell at the fence that it’s about to start.

Pushback: the short answer

In a pushback, an aircraft tug pushes the aircraft backward out of its parking position onto the taxiway, lines it up in the taxi direction and then disconnects. Only after that does the aircraft taxi to the runway under its own power. This is necessary because most airliners park with the nose toward the terminal – at the jet bridge that is the most space-saving solution – and because a jet has no reverse gear.

An aircraft’s wheels are not driven. Thrust comes exclusively from the engines, and they push forward, plain and simple. A jet could only move backward with thrust reversers. That is possible but is hardly practiced anymore for good reasons – more on that below. So a tug takes over the first few meters, and the tug driver steers because the pilots simply can’t see anything behind them.

Why aircraft don’t back out on their own

In theory, a jet could taxi backward using thrust reversers. This maneuver is called powerback. In the 1980s it was quite common in the US on rear-engined jets such as the DC-9, Boeing 727 and MD-80 because it needed less ground staff. Northwest Airlines only gave up the procedure in 2005, citing fuel consumption.

Today powerback is the exception. The drawbacks weigh heavily:

• Foreign objects: The forward-directed exhaust blast whips up stones, dirt and small parts. They can get into the engine, hit windows at the terminal or injure ground staff. With engines under the wing, close to the ground, the risk is especially high.
• Noise and jet blast: Exhaust and noise are directed straight at buildings, vehicles and people at the position.
• Wear and consumption: Thrust reverse on the ground costs fuel and puts extra strain on the engines.
• Tail strikes: If you brake while reversing, you risk the aircraft tipping back and the tail touching the ground.

Manufacturers and airports therefore mostly prohibit powerback or allow it only at designated positions and under suitable conditions. Military transports such as the C-130, C-17 or C-5 can technically do the maneuver but show it more at airshows. For you at the fence that means: a powerback at a large European airport is a real rarity.

The two types of tug

Aircraft tugs – in jargon often called “pushback”, “tug” or “pusher” – come in two basic designs. You will see both on every big apron, often right next to each other.

Feature	Tug with towbar	Towbarless tug
Connection	bar between tug and nose gear	tug grips the nose wheel and lifts it
Hooking up	bar has to be fitted to suit the aircraft type	no bar change, nose wheel is picked up directly
Protection	shear pin in the bar as a breaking point	overload protection in the tug itself
Handling	bar acts as a lever, leisurely pace	a single pivot point, more precise maneuvering
Appearance	flat, heavy vehicle plus a long bar in front of the nose	wide vehicle with a pickup cradle, nose wheel visibly raised

Tugs with a towbar are the classic solution. Every bar needs a head that fits the nose gear of the respective type. A built-in shear pin breaks on overload so the landing gear isn’t damaged. So the aircraft doesn’t keep rolling uncontrolled if a bar breaks, someone in the cockpit must be ready to brake. Large tugs of this kind are heavy – the dead weight provides the traction to move a fully fueled long-haul aircraft.

Towbarless tugs drive around the nose wheel, clamp it and lift it slightly. Because part of the aircraft’s load then rests on the tug, the tug gets additional traction. Hooking up is faster, and because there is only one pivot point, the aircraft can be maneuvered more tightly and precisely. You can find more on designs, manufacturers and the small remote-controlled units in hangars and at small airfields in the article Aircraft tugs and towbarless technology.

The procedure step by step

From the outside a pushback looks like a minute of maneuvering. Behind it is a well-rehearsed procedure that airlines and handlers describe precisely in their procedures. Roughly, it runs the same way at every airport.

The sequence around the brakes is important: while the tug is hooking up, the aircraft stands on the parking brake. Pushing starts only once the crew has confirmed the release, and it only stops for good once the parking brake is set again. How arrival, unloading and loading and departure interlock in time is covered in the guide Turnaround: how aircraft ground handling works.

The steering pin: small part, big effect

On many aircraft types there is a way at the nose gear to decouple the hydraulic nose wheel steering from the cockpit. For that the ground crew inserts a bypass or steering pin. The reason: during towing, the tug steers the nose wheel. If the aircraft’s own steering worked against it at the same time, the bar or landing gear could be damaged.

After disconnecting, the pin has to come out again – otherwise the crew can’t steer. That is why there is the ritual you can see from every deck: the team member holds up the pin, often with a red streamer on it, visible to the pilots. That is not a friendly wave but a safety confirmation. Whether and how the pin is used depends on the aircraft type and the airline’s procedures.

Communication: headset, radio and hand signals

During pushback, two communication channels run in parallel.

Cockpit and ground crew talk via a cable headset plugged into the nose gear. Depending on the handler, the crew’s counterpart is the tug driver himself or a colleague walking alongside the aircraft – what this job looks like is described in the article Working on the apron. Communication is short and standardized, in English: whether the crew is ready, whether the brakes are released, that the pushback begins, when an engine can be started and that the pushback is complete. With “engine area clear” or a similar call, the ground crew confirms that nobody is standing behind or in front of the engine.

Cockpit and air traffic control talk by radio. The crew reports with its position and asks for pushback, and the responsible unit gives clearance, makes them wait or specifies which direction the nose points at the end. At many large airports this is handled not by the tower but by a separate apron control that regulates traffic on the parking areas. Who does what on the radio is explained in the article Delivery, Ground, Tower, Approach, Center, and the structure of the standardized phrases in the guide to radiotelephony phraseology. The job behind apron control is described in the article Apron control.

If the headset fails or isn’t connected, there are standardized hand signals. The most important one you see at the end of every pushback: hold up the pin, then the signal to start taxiing.

Engine start during pushback

Standing at the position for a long time and only then starting the engines would cost time. That is why many crews start the engines during the pushback. The prerequisite is that there is enough distance from the building, jet bridge and other aircraft and that the ground crew has reported the area at the engine clear. Depending on the airport, an additional engine start clearance from the responsible unit is required, or it is issued together with the pushback clearance.

Until the engines are running, the APU – the auxiliary power unit in the tail – usually supplies power and compressed air for the start procedure. If you hear a high-pitched whine from the tail at the deck before anything is even moving, that is very likely the APU. When it runs and when ground power is used is explained in the article APU, ground power and PCA.

How to recognize a pushback at the fence

If you know what to look for, you can see a pushback coming minutes ahead. That is handy if you want to photograph or film departures from the deck.

• Vehicles disappear: Baggage belts, catering lifts and fuel trucks drive away, the cargo doors close.
• The bridge undocks: The jet bridge pulls back from the fuselage – a pretty sure sign that it will start in a few minutes.
• The tug is ready: A tug is parked in front of the nose or is just hooking up.
• The red beacon comes on: The anti-collision lights (beacon) on top of and below the fuselage signal that engines will soon be running or the aircraft will be moving.
• Chocks and cones gone: When ground staff become active around the landing gear, the pushback is imminent.

Which positions at your airport are pushed and where aircraft taxi out themselves depends on the design of the parking areas. The article Gates, jet bridges and remote stands explains the differences. How to keep following taxiways and holding points after the pushback is shown in Understanding taxiways, holding points and signs.

Good places for pushback photos

For pushbacks you need a view of the apron, not the runway. Observation decks directly at the terminals are therefore ideal – you see the hookup, the push, engine start and the pin signal from a few dozen meters.

• The observation deck at Hamburg Airport is right at the terminals and offers close views of ground handling.
• From the Düsseldorf observation deck you watch operations at the gates.
• At large hubs like Frankfurt Airport and Munich Airport the apron is huge. If you want to experience operations up close, the best bet is to book an apron tour there – more in the article Airport tours and apron tours.

It is especially busy during departure banks at hubs: then numerous aircraft are pushed back one after another in a short time, and queues form on the taxiways. How these banks come about and when they arrive is described in the guide Understanding and using hub banks.

Special cases: nose-out, powerback and TaxiBot

Not every departure begins with a pushback. There are three variants you should know.

The TaxiBot is a semi-automatic, towbarless tug with a diesel-electric drive, developed by Israel Aerospace Industries. It pushes the aircraft back as in a normal pushback but then keeps towing it almost to the takeoff position. Steering is done from the cockpit: sensors detect the pilot’s steering inputs and convert them into drive commands for the tug. The engines therefore only have to run shortly before takeoff. Lufthansa tested the system at Frankfurt Airport. In November 2014, flight LH140 to Nuremberg was the first scheduled flight to taxi to takeoff with a TaxiBot, and from February 2015 the system went into regular operation there. From 2019, Air India used the TaxiBot in Delhi. Whether and how often you see it today depends on the airport – a TaxiBot operation is a rewarding subject for spotters.

Virgin Atlantic pursued a similar approach as early as the mid-2000s by towing long-haul jets toward the runway. However, the project was discontinued again because the load on the landing gear, and with it maintenance costs, rose.

Pushback in winter

In winter pushback gets more demanding. On a slippery apron the tug can slide, and because many aircraft are de-iced before takeoff, the procedure shifts: at some airports de-icing is done right at the position, at others on separate de-icing pads that aircraft taxi to after the pushback. The procedure then has an additional station, and the time between pushback and takeoff gets longer. You will find background in the articles De-icing of aircraft and Winter operations at the airport.

What to watch for as a spotter

• Wait for the pin signal. For videos, the moment the pin is held up and the aircraft starts rolling is the natural end of a pushback sequence.
• Plan for the engine start. The exhaust blast makes the air shimmer behind the engine. If you want detail shots of the fuselage, it’s best to shoot before the start or at a distance from the engine axis.
• Listen in on the radio where allowed. If you follow the clearances on the radio, you know earlier which aircraft will be pushed next. What applies legally is covered in the article Listening to aviation radio: the legal situation.
• Respect the ground crew. Handlers work under time pressure. Shouting, laser pointers or flash toward the apron are taboo – more on the rules in the article Is plane spotting allowed?.
• Look up technical terms. From “beacon” to “chocks”: the plane spotting glossary explains the most important terms around the apron.

Conclusion

The pushback is the hinge between ground handling and taxiing: a tug takes over the first few meters because a jet has no reverse gear and powerback with thrust reversers brings too many drawbacks. Behind it is a precisely coordinated interplay of cockpit, tug driver, headset and clearance on the radio, often with the engine start in the middle of the push. If you know the signals – bridge off, beacon on, tug attached – you see every departure coming and catch the moment the pin is held up.