Definition
A standardized set of visual hand and light signals used by ground personnel (such as marshallers or line crew) to direct a pilot during taxi, parking, and engine start/shutdown operations. The signals cover actions including come ahead, turn left, turn right, slow down, stop, brakes on/off, chocks in/out, start engines, cut engines, and emergency stop. They are recognized industry-wide so that any qualified pilot and any qualified marshaller can communicate without verbal exchange.
Plain English
A common 'sign language' between the person on the ground and the pilot in the cockpit, used to safely guide the airplane while it is moving on the ramp or being parked.
Context Anchor
Seen during ramp operations, aircraft parking, engine start areas, and any situation where a pilot is being guided by a person on the ground instead of relying only on radio communication.
Derivation
“Standard” means established and commonly accepted. “Taxiing” in aviation means moving an aircraft on the ground under its own power. “Signal” comes from the idea of a sign used to communicate. Together, the phrase means established signs used to communicate with an aircraft during ground movement.
Why Pilots Care
Using the correct signals prevents collisions, runway incursions, and damage to the aircraft or other equipment.
Grounding Statement
Picture a person standing in front of the aircraft using clear arm motions so the pilot knows how to move safely on the ramp.
Intuition Check
“Standard” does not mean each airport makes up its own gestures. Here it means recognized signals that pilots and ground personnel are expected to understand the same way.
Example Sentence 1
As the airplane approached the parking spot, the line attendant gave standard taxiing signals to guide it between the two parked aircraft.
Example Sentence 2
When the ground crew extended one arm and swung the other in a circle, the pilot recognized the standard aircraft taxiing signal to turn left.