The Rules and the Pilot-in-Command

Road traffic works because every driver expects every other driver to follow the same rules. Aviation needs the same predictability, but its traffic crosses borders in hours and oceans in a night, so the rules had to be agreed internationally before they could work at all. This lesson introduces the two rulebooks a European pilot lives under: ICAO Annex 2, the worldwide Rules of the Air, and SERA, the European regulation that makes one common version of those rules directly binding law. It then turns to the person the rules hold responsible: the pilot-in-command.

Annex 2: one set of rules for the world

The Chicago Convention's Article 12 obliges every contracting state to keep its flight rules aligned with those made under the Convention, as the first lesson described. The rules themselves live in ICAO Annex 2, Rules of the Air. Its purpose is exactly the road-traffic idea: collision avoidance and orderly flight depend on every pilot being able to predict what every other pilot will do, and that only works if everyone follows the same rules. Annex 2 is unusual among the Annexes in one way the exam loves: it contains Standards only, with no Recommended Practices. A recommended rule of the road would be no rule at all, so everything in Annex 2 is binding.

Its scope clause says who must follow it: the rules apply to aircraft bearing the nationality and registration marks of a contracting state, wherever they may be, to the extent that the rules do not conflict with the rules published by the state having jurisdiction over the territory overflown. Read that carefully: your marks carry Annex 2 with you around the world, but the local state's own rules win wherever that state has jurisdiction. Where no state has jurisdiction, nothing can win against Annex 2 — which is why, over the high seas, Annex 2 applies without exception. The ICAO Council resolved this when it adopted the Annex in 1948: over the high seas the Annex 2 rules are the rules Article 12 makes obligatory, and no state may file a difference against them there.

In content, Annex 2 is compact: chapters on applicability and general rules, a chapter of visual flight rules, a chapter of instrument flight rules, and appendices carrying the tables every pilot memorises, among them the signals (lights, ground signals, marshalling) and the interception procedures. The rest of this module walks through exactly that material.

SERA: the European rules of the air

Annex 2 permits national differences over national territory, and by the 2000s Europe had accumulated a patchwork of them. The answer was Commission Implementing Regulation (EU) No 923/2012, the Standardised European Rules of the Air, universally shortened to SERA. As an EU regulation it is directly applicable law in every member state: one common set of flight rules replacing the national versions, with the states keeping only the options and supplements the regulation itself leaves open to them.

SERA's content is broader than Annex 2's. Its core transposes Annex 2 into EU law, but the regulation and its amendments also pull in the provisions of ICAO Annex 11 and of the air traffic management procedures document PANS-ATM (Doc 4444) that matter to pilots and to air traffic services: airspace classes, flight plan handling, position reporting, communication-failure procedures. The result is one document in which a European pilot finds nearly all the operational rules of flight. Its scope clause mirrors Annex 2's logic:

Into, within or out of the Union — SERA applies to airspace users and aircraft engaged in general air traffic (flights conducted under the civil rules of the air; military and other state flights operating under their own rules fall outside) operating into, within or out of EU airspace, whatever register they fly on.
EU-registered aircraft anywhere — it also applies to aircraft bearing the nationality and registration marks of an EU member state in any airspace, to the extent that its rules do not conflict with the rules published by the state having jurisdiction over the territory overflown.

One SERA provision frames the whole module. The operation of an aircraft, whether in flight, on the movement area of an aerodrome (the runways, taxiways and aprons) or at an operating site, must comply with the general rules and the applicable local provisions at all times, and in flight additionally with either the visual flight rules or the instrument flight rules. There is no third option: every flight is a VFR flight or an IFR flight, and the general rules bind both. The next lesson takes the general rules; the last lesson of this module takes VFR and IFR.

Whose rules apply where

Put Annex 2 and SERA together and the territorial principle emerges: which rules of the air apply is decided by where the aircraft is, not by where it is registered. Over a state's territory, that state's rules apply: for an EU member state that means SERA plus the state's national supplements. Over the high seas, Annex 2 applies without exception. And an aircraft abroad follows the rules of the state it is flying over: a Dutch-registered aircraft in Brazilian airspace flies by Brazil's rules, its SERA obligations reaching only as far as they do not conflict.

The pilot-in-command

The rules need an addressee, and SERA names one person. The pilot-in-command (PIC), the pilot designated by the operator (or, for general aviation, by the owner) as being in command and charged with the safe conduct of the flight, is responsible for the operation of the aircraft in accordance with the rules of the air, whether manipulating the controls or not. The second half of that sentence is the exam's favourite: on a two-pilot flight deck the co-pilot may be the one flying, and on any flight the autopilot may be, but responsibility for compliance never moves. It sits with the PIC from the moment of taking command to the end of the flight.

Responsibility comes paired with power. Under SERA, the PIC has final authority as to the disposition of the aircraft while in command: the last word on what is done with the aircraft. Company procedures, dispatchers, even air traffic control instructions inform the PIC's decisions, but none of them outranks the PIC in deciding what the aircraft actually does. The authority exists for safety's sake: when seconds matter, exactly one person must be entitled to decide, and it is the person the rules will afterwards hold responsible.

May the PIC ever break the rules? In one circumstance only: the PIC may depart from the rules of the air in circumstances that render such departure absolutely necessary in the interests of safety. The bar is deliberately high (absolutely necessary, not convenient), and safety is the only ground the provision admits. A pilot who descends through a cruising level without clearance to escape severe airframe icing that the aircraft cannot carry is inside the provision; a pilot who cuts a corner to save fuel is not. The departure lasts exactly as long as the emergency does, and the PIC remains answerable for the judgement afterwards.

Before the flight

The PIC's responsibility starts before the wheels move. Before beginning any flight, the PIC must become familiar with all available information appropriate to the intended operation: weather, aerodromes, airspace, notices to airmen (NOTAMs) — whatever bears on the flight. For two categories the rule then sharpens. For flights away from the vicinity of an aerodrome, and for all IFR flights, the pre-flight action must include three named elements:

A careful study of available current weather reports and forecasts — not a glance: a careful study, of both the reports describing what the weather is and the forecasts saying what it will become.

Taking fuel requirements into account — the weather picture feeds the fuel decision: headwinds, expected routings and the chance of holding all change how much fuel the flight needs.

An alternative course of action if the flight cannot be completed as planned — a plan B, decided on the ground: where the flight goes if the destination is unusable, and the fuel to get there.

Notice the scope: every IFR flight owes the full careful study, however short the sector, because an IFR flight is planned into weather that may leave nothing to see and no way to improvise. A VFR flight staying in the vicinity of its aerodrome owes the general familiarisation but not the sharpened triple.

Psychoactive substances

One rule addresses the pilot's own state. No person whose function is critical to the safety of aviation (the rules call them safety-sensitive personnel, and flight crew members head the list) shall undertake that function while under the influence of any psychoactive substance by reason of which human performance is impaired. Alongside it stands an absolute companion rule: such persons shall not engage in any kind of problematic use of substances. The first rule turns on effect: the substance has impaired the person's performance, so the function is forbidden now; the second bans a pattern of use outright, impaired today or not.

What counts as a psychoactive substance is a defined list, and the exam asks for its edges:

In the definition — alcohol, opioids, cannabinoids, sedatives and hypnotics, cocaine, other psychostimulants, hallucinogens, and volatile solvents.

Explicitly excluded — coffee and tobacco. Caffeine and nicotine are stimulants in the pharmacological sense, and the definition excludes them by name so that a cup of coffee before departure breaks no rule.