When an aircraft is moving on an apron or entering a parking stand, the pilots may be unable to judge directly how close the wings, engines, landing gear and tail are to nearby equipment or structures. Aircraft marshalling solves that problem through a standardised visual conversation between a trained ground signalman and the flight crew. ICAO describes marshalling as one-to-one visual signalling between ground personnel and pilots and requires standard signals to be given clearly and precisely by a trained, qualified and approved signalman. [1]
Marshalling is not simply a collection of improvised hand gestures. ICAO Annex 2 standardises the signals and specifies how the signalman is identified, what visual aids are used and who may perform the function. The FAA Aeronautical Information Manual likewise publishes standard ground hand signals for movements such as straight ahead, turns, slowing, stopping, engine start, chock insertion and engine shutdown. The current FAA AIM is effective 9 July 2026. [2] [3]
Why pilots need a marshaller
An airliner cockpit gives excellent forward visibility in normal taxi, but it does not provide a direct view of the wing tips, most engines, main landing gear or tail. The problem becomes more significant on large aircraft because the pilot’s eye position can be many metres ahead of the main gear and far inboard of the wing tips. A turn that looks safe from the cockpit can still place a main gear near the pavement edge or a wing tip near an obstacle. [4]
PANS-Aerodromes identifies sufficient clearance between aircraft, equipment and buildings as a key part of stand allocation and states that marshalling guidance may be required where a visual guidance system is unavailable or where a temporary safety hazard exists. The marshaller therefore acts as a trained external observer positioned where the pilot can see the signal while the marshaller assesses the aircraft’s relationship to the stand and surrounding hazards. [4]
Marshalling and ATC do different jobs
Air traffic control can issue a taxi clearance to an apron or stand area, but the marshaller is not replacing ATC. ATC manages aircraft movement and traffic separation within the relevant controlled movement area; marshalling provides close-range visual guidance for the aircraft’s final ground manoeuvring or other specific apron movement. Local responsibility boundaries depend on the aerodrome’s approved operating arrangements. [5]
A pilot therefore does not interpret a marshaller’s hand signal as authority to cross a runway holding position or disregard an ATC clearance. The aircraft must still comply with the applicable air traffic and aerodrome procedures. Marshalling tells the pilot how to manoeuvre safely within the authorised ground movement. [2]
Where the marshaller stands
ICAO’s standard signals are designed around the marshaller being visible to the pilot. For fixed-wing aircraft, the signalman is positioned where the pilot can clearly observe the signals, traditionally on the left side/front sector of the aircraft as specified in the standard. The FAA AIM includes a dedicated diagram showing the signalman’s position relative to the aircraft. [1] [2]
The exact stand position is influenced by the aircraft type, parking geometry and local procedure. The fundamental requirement is that the marshaller remain clearly visible and outside hazardous areas while retaining enough perspective to judge the aircraft’s movement. Standing somewhere the pilot cannot see defeats the communication link on which the process depends. [4]
Why high-visibility clothing is required
ICAO states that the signalman must wear a distinctive fluorescent identification vest so the flight crew can identify the person responsible for the marshalling operation. PANS-Aerodromes likewise calls for a distinctive high-visibility jacket or vest. The purpose is more important than simple workplace visibility: pilots must know which person’s signals they are expected to follow when several ground staff may be present around a stand. [1] [4]
This identification is particularly important during pushback, towing or complex apron activity where wing walkers, headset operators, baggage staff and vehicle drivers may all be visible from the cockpit. Only the designated signalling chain should guide the aircraft. [6]
Wands, bats and illuminated signals
ICAO Annex 2 specifies daylight-fluorescent wands, bats or gloves for signalling during daylight and illuminated wands at night or in low visibility. These aids make arm position and movement easier to distinguish from the cockpit. [1]
The wand itself has no independent meaning; the standardised movement of the arms and wands creates the signal. An illuminated wand should therefore not be interpreted like a traffic light merely because it is bright. Pilots are trained to recognise the complete gesture and its direction. [2]
Straight ahead
The straight-ahead signal tells the pilot to continue moving toward the marshaller along the intended path. The FAA AIM illustrates the signal using both arms moving in a repeated motion that is readily visible from the cockpit. ICAO Annex 2 provides the standard international form. [2] [1]
The instruction is directional rather than a command for a particular taxi speed. The marshaller can also give a slow-down signal when the aircraft is approaching its stopping position or when conditions require a reduced pace. The pilot remains responsible for controlling aircraft speed and maintaining safe operation. [2]
Left and right turns are from the pilot’s perspective
A potential source of confusion is reference direction. Standard marshalling turn signals are described from the pilot’s point of view. A signal to turn left therefore means the aircraft’s left, not the marshaller’s left while facing the aircraft. This is why training and standardisation matter; an intuitive mirror-image gesture could otherwise send the aircraft in the wrong direction. [7]
The speed of the marshaller’s signalling movement can also communicate the desired rate of turn in published signal descriptions. The pilot uses nose-wheel steering and the aircraft’s normal taxi controls to produce the manoeuvre; the marshaller does not specify a precise steering angle. [7]
Slow down
As the aircraft approaches a stand stop point, the margin for error reduces. The slow-down signal tells the pilot to reduce taxi speed while continuing the guided movement. The FAA AIM includes a standard illustration for this instruction. [2]
Reducing speed gives both the flight crew and marshaller more time to detect a developing alignment or clearance problem. It also reduces the distance travelled between a stop signal and the aircraft actually coming to rest, since an airliner has considerable mass and cannot halt instantaneously. [4]
The stop signal
The stop signal is one of the most safety-critical gestures in the sequence. FAA and ICAO standards specify a conspicuous arm/wand position that is deliberately distinct from turn or proceed signals. The pilot responds by braking the aircraft to a stop at the required position. [2] [1]
Because the aircraft continues to move while the brakes build deceleration, the marshaller anticipates stopping distance rather than waiting until the nose wheel is exactly on the target before first signalling stop. Local procedures, aircraft characteristics and stand markings determine the exact technique. [5]
Emergency stop
Standard marshalling systems include an emergency-stop or immediate-stop concept distinct from routine stopping. It is used when continuing the movement would create an immediate hazard. The gesture is deliberately more urgent and conspicuous than the normal stop instruction. [1]
PANS-Aerodromes requires the marshaller to take action if an incident occurs during marshalling and to ensure the assigned stand is free of fixed and mobile obstructions before guiding the aircraft in. This places hazard detection at the centre of the role, not merely accurate parking. [4]
Insert and remove chocks
Once an aircraft is stopped, wheel chocks can be positioned to prevent unintended movement. Standard signals tell the crew when chocks have been inserted or when they may be removed. The FAA AIM publishes separate “insert chocks” and “pull chocks” hand signals. [2]
The signal does not itself prove that every ground-handling condition for departure has been satisfied. Operators have separate procedures covering parking brake status, tug connection, ground equipment clearance and headset communication. Marshalling is one part of that controlled turnaround sequence. [6]
Engine start and engine shutdown signals
The FAA AIM includes standard signals for starting an engine and cutting engines. An engine-start signal identifies the engine concerned so the flight crew can distinguish which powerplant is being referred to. This matters especially on multi-engine aircraft, where ground personnel may need to confirm that the area around a particular engine is clear before start. [2]
The marshaller’s signal does not replace the aircraft’s approved engine-start procedure. The flight crew still confirms the required checklist items, clearances and aircraft conditions before introducing fuel or starting rotation. The visual signal forms part of the coordination with ground personnel. [6]
Engine numbering can be counterintuitive to the marshaller
Aircraft engines are conventionally numbered from the aircraft’s left to right. A marshaller facing the nose therefore sees the numbering reversed from their own left-to-right perspective. Published guidance explicitly warns ground personnel about this viewpoint difference. [7]
This is another example of why standard terminology and training are essential. Pointing casually to “the engine on my right” is not an acceptable substitute for a standard engine-identification procedure when crews and ground personnel are looking at the aircraft from opposite directions. [7]
Wing walkers extend the marshaller’s view
On congested stands or during towing, additional ground personnel may be positioned near wing tips or other critical clearance points. These wing walkers or guides communicate obstruction status through the approved ground-handling chain rather than independently steering the aircraft with competing signals. Published marshalling signal sets include a wingwalker/guide indication showing that movement is unobstructed. [7]
The main marshaller must retain a clear understanding of those observers’ status. If any wing walker loses clearance or visibility, the movement should be stopped according to the local procedure. The safety objective is to prevent a situation in which one person sees a hazard but the pilot continues because the primary signal remains “move”. [6]
Marshalling versus a Visual Docking Guidance System
Many large airport stands use an automated Visual Docking Guidance System, or VDGS/A-VDGS, instead of a marshaller for normal arrival. Such systems identify the aircraft and provide electronic azimuth and stopping guidance. PANS-Aerodromes states that marshalling should be provided where guidance systems do not exist, are unserviceable or when temporary hazards require additional visual guidance. [4]
The two methods therefore serve the same broad parking objective through different interfaces. A docking system communicates with illuminated symbols or displays; a marshaller communicates with standard human signals. Airports can use either according to stand equipment, aircraft compatibility and operational conditions. [5]
Why the stand must be checked first
A marshaller should not guide an aircraft into a space that has not been confirmed clear. ICAO PANS-Aerodromes states that the marshaller must ensure the stand to be used is free of fixed and mobile obstructions. That includes vehicles, baggage equipment, ground-power units, passenger stairs, misplaced chocks or other objects that could enter the aircraft’s swept path. [4]
Large engines can also ingest loose objects, and jet blast can move unsecured equipment. Apron safety therefore extends beyond avoiding a direct wing strike. The complete stand environment has to be prepared for the arriving aircraft. [6]
Jet blast and ingestion zones
Ground personnel working near operating engines face both intake and exhaust hazards. A marshaller must stay outside the dangerous areas defined by the aircraft and operator while remaining visible to the pilots. Ground staff also coordinate engine start and shutdown so no person, vehicle or loose equipment is in an unsafe position when thrust is produced. [6]
The exact safe distances depend on aircraft type, engine power and operating condition. A generic article should therefore not publish one universal “safe distance” for all engines. Airport and operator ground-handling manuals provide aircraft-specific hazard areas. [6]
Marshalling during towing and pushback
An aircraft being towed or pushed is often controlled through a coordinated team involving tug driver, headset operator, wing walkers and sometimes a marshaller. The FAA AIM includes a signal specifically for directing towing as part of its ground hand-signal set. [2]
During pushback the pilot normally cannot see the tug or the immediate area behind the aircraft, so communication with ground personnel is critical. The exact division of responsibility between tug driver, headset operator and marshaller is defined by the airline, handler and airport procedures. [6]
Why training and approval are required
ICAO Annex 2 states that no person shall guide an aircraft unless trained, qualified and approved by the appropriate authority to perform signalman duties. This requirement reflects the consequences of an incorrect signal: an airliner can weigh hundreds of tonnes and have engines and wing tips extending far beyond the pilot’s direct field of view. [1]
Training includes more than memorising gestures. Marshallers need to understand apron hazards, aircraft clearances, engine danger areas, communication discipline, stand layout and the conditions under which movement must be stopped. ICAO airside guidance calls for appropriate training and competency checks to keep staff current. [6]
The pilot does not surrender responsibility
Following a marshaller does not remove the pilot-in-command’s responsibility for safe aircraft operation. If a signal is unclear, contradictory or appears unsafe, the crew can stop the aircraft and resolve the uncertainty. ICAO requires the signals to be clear and precise precisely because ambiguous visual communication should not be guessed at. [1]
This principle also applies if the crew loses sight of the designated marshaller. Continuing to taxi on an assumption about what the next signal would have been would defeat the purpose of positive visual guidance. Operator procedures define the exact stop-and-re-establish-communication response. [5]
Why standardisation matters internationally
International airline crews operate at airports whose local languages, ramp layouts and ground-handling companies vary enormously. A standard visual vocabulary allows a pilot arriving in another country to recognise the same fundamental signals for proceed, turn, slow, stop, chocks and engines. ICAO Annex 2 is the international basis for that standardisation. [8]
National publications can reproduce or supplement those signals. The FAA AIM, for example, provides illustrated U.S. hand signals in its airport-operations chapter. Local operating instructions can add procedures, but they should not create gestures likely to be confused with the standard signals. ICAO explicitly states that Appendix 1 signals should be used only for their designated purpose and that other signals likely to cause confusion should not be used. [1]
What marshalling is really doing
From the cockpit, marshalling may look deceptively simple: a person with two illuminated wands waves the aircraft into position. In reality, that person is acting as the flight crew’s external line of sight to areas the pilots cannot directly observe. Before movement, the stand must be clear. During movement, the marshaller has to remain visible, interpret the aircraft’s trajectory, identify hazards and communicate corrections using an internationally standardised signal set. [4]
The system works because both sides know the language in advance. The marshaller does not improvise and the pilot does not guess. A standard gesture means one action; conspicuous wands make the gesture visible; high-visibility clothing identifies the responsible signalman; wing walkers extend obstacle awareness where necessary; and the aircraft stops whenever the visual chain becomes uncertain. That combination turns a few hand movements into a formal ground-safety system. [1]
Verified Sources / References
- ICAO Annex 2 — Rules of the Air, Appendix 1 Signals. ICAO standards covering the signalman, qualification, identification, wands and standard aircraft marshalling signals.
- Federal Aviation Administration Aeronautical Information Manual — Airport Operations, 4-3-26 Hand Signals. Current FAA illustrated ground-hand-signal set.
- FAA Air Traffic Plans and Publications. Confirms the current AIM revision effective 9 July 2026.
- ICAO PANS-Aerodromes Amendment Material — Apron Management and Marshalling Service. ICAO provisions concerning stand clearance, when marshalling is provided and high-visibility identification.
- ICAO Doc 9981 — Procedures for Air Navigation Services: Aerodromes, 3rd Edition. ICAO operational framework for aerodrome operators and apron safety.
- ICAO Airside Safety Handbook — Aircraft Marshalling. Ground-safety guidance on marshalling service, training and apron hazards.
- Aeronautical Information Manual material — Marshalling Signals. Published signal descriptions including pilot-perspective turns, wingwalker guidance and engine numbering.
- ICAO — Annex 2 Rules of the Air: Marshalling Signals Background. ICAO description of aircraft marshalling as standard one-to-one visual signalling.
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