Special Operational Procedures and Hazards — Page 156, Lesson 240

I want to walk you through noise abatement procedures, which are a key part of special operational procedures and hazards. Let's start with the regulatory foundation. EU-OPS requires operators to establish noise abatement procedures for IFR operations, and these must follow ICAO PANS OPS Doc 8168. That's the document that sets the international standards for aircraft operations. Each individual state—meaning each country—will then detail its own noise abatement procedures for each aerodrome, and you'll find those published in the national Aeronautical Information Publication, specifically in sections AD 2 and 3. So when you're preparing for a flight, that's where you look for the specific noise rules at your destination. These procedures are designed specifically for turbojet aeroplanes—so jet aircraft—and they can include any one or more of three main elements. First, the use of noise preferential runways. This means the airport authority will direct the initial flight path after takeoff and the final flight path on approach away from noise sensitive areas—places like residential neighborhoods, schools, hospitals. They choose a runway that points the aircraft over less populated terrain. Second, the use of noise preferential routes. These are specific flight paths on departure and arrival that help the aircraft avoid noise sensitive areas located under or adjacent to the usual takeoff and approach flight paths. So even if you're using a certain runway, you might be given a specific turn or heading to keep the noise away from people on the ground. Third, the use of noise abatement takeoff or approach procedures. These are specific profiles—how you fly the aircraft—designed to minimize the overall exposure to noise on the ground, while at the same time maintaining the required level of flight safety. So it's a balance: reduce noise, but never at the expense of safety. Now, the operator—the airline you work for—must establish appropriate operating departure and arrival/approach procedures for each aircraft type. And there are three critical requirements here. Requirement (a): The operator shall ensure that safety has priority over noise abatement. That is non-negotiable. If a noise abatement procedure would compromise safety, you do not use it. Requirement (b): These procedures shall be designed to be simple and safe to operate, with no significant increase in crew workload during critical phases of flight. Critical phases are things like takeoff, initial climb, final approach, and landing—when your attention is already stretched. The noise procedure must not make that worse. Requirement (c): For each aeroplane type, two departure procedures shall be defined, in accordance with ICAO. So for every jet aircraft in the fleet, the operator must publish two distinct noise abatement departure profiles. We'll get into what those two procedures actually are in the next part of the material. Let me also clarify one thing the excerpt mentions at the top: the comment about a carpark or food outlet near an airport. That's just saying that just because an airport exists doesn't mean there will never be development nearby. But once the aerodrome is established, the aviation authority will consider bird risk when assessing planning applications for things like restaurants or parking lots near the airport. That's a separate hazard—bird strike risk—but it's mentioned here to show that noise isn't the only environmental consideration. So to summarise: noise abatement is a regulatory requirement under EU-OPS, based on ICAO PANS OPS Doc 8168. It uses preferential runways, preferential routes, and specific departure/approach procedures. Safety always comes first, the procedures must be simple and not increase workload during critical phases, and for each jet aircraft type, two departure procedures must be defined.