Operator Supervision and Certification — Page 31, Lesson 46

I want to walk you through a set of definitions that are essential for understanding how an operator certifies and supervises its operations — particularly for long-range and alternate aerodrome planning. These are formal terms used in regulatory manuals, and you'll need them for flight planning, fuel calculations, and ETOPS operations. Let's start with (c) Adequate ETOPS en route alternate aerodrome. This is an aerodrome that meets the general definition of "adequate" — meaning it's suitable for the aeroplane type — but with two extra requirements. At the expected time of use, it must have an Air Traffic Service facility, and it must have at least one instrument approach procedure. So it's not just a runway; it's a fully equipped diversion field with ATS and an instrument approach available when you might need it. Next, (d) En route alternate (ERA) aerodrome. This is an adequate aerodrome located along the route. It may be required at the planning stage — meaning the dispatcher or commander may need to identify one during pre-flight planning, depending on the rules that apply. Then we have (e) 3% ERA. This is a specific type of en route alternate aerodrome. It's selected for the purpose of reducing contingency fuel to 3%. Normally, contingency fuel might be calculated at a higher percentage, but if you nominate a 3% ERA, you can use a lower contingency fuel figure — 3% of the planned fuel — because you have a designated alternate along the route to fall back on. Now (f) Isolated aerodrome. This is a special status the Authority can grant to a destination aerodrome. The idea is that if the nearest adequate destination alternate aerodrome is so far away that the fuel required to divert there — including final reserve fuel — exceeds a certain threshold, then the destination itself can be treated as isolated. For aeroplanes with reciprocating engines, that threshold is the fuel to fly for 45 minutes plus 15% of the flight time planned at cruising level, or two hours, whichever is less. For turbine-engine aeroplanes, it's fuel to fly for two hours at normal cruise consumption above the destination aerodrome, including final reserve fuel. So if the diversion fuel needed is more than that, the destination is considered isolated, and different fuel planning rules apply. Moving to (g) Equivalent position. This is a position that can be established using a DME distance, a suitably located NDB or VOR, an SRE or PAR fix, or any other suitable fix. The key detail is that it must be between three and five miles from the threshold, and it must independently establish the aeroplane's position. So it's a precise, independent fix used for approach or positioning purposes. Next, (h) Critical phases of flight. These are specifically defined as the take-off run, the take-off flight path, the final approach, the landing including the landing roll, and any other phases of flight at the discretion of the commander. During these phases, the flight crew's attention must be focused on flying the aircraft — no non-essential activities. Now (i) Contingency fuel. This is the fuel required to compensate for unforeseen factors that could affect fuel consumption to the destination aerodrome. The excerpt lists examples: deviations of an individual aeroplane from expected fuel consumption data, deviations from forecast meteorological conditions, and deviations from planned routings or cruising levels or altitudes. So it's a buffer for things you can't predict exactly. Then (j) Separate runways. These are runways at the same aerodrome that are separate landing surfaces. They may overlay or cross, but the critical point is that if one runway is blocked, it will not prevent the planned type of operations on the other runway. Additionally, each runway must have a separate approach procedure based on a separate navigation aid. So they are operationally independent even if they physically intersect. Next, (k) Approved one-engine-inoperative cruise speed. For ETOPS operations, this is a speed within the certified limits of the aeroplane, selected by the operator and approved by the regulatory Authority. It's the speed you plan to use if an engine fails during the ETOPS portion of the flight, and it must be approved for the intended area of operation. Then (l) ETOPS area. This is an area containing airspace within which an ETOPS-approved aeroplane remains in excess of a specified flying time — in still air, in standard conditions — at that approved one-engine-inoperative cruise speed from an adequate ETOPS route alternate aerodrome. So it defines the region where you can operate under ETOPS rules, based on how far you are from a suitable diversion field at that reduced speed. Finally, (m) Dispatch. ETOPS planning minima apply until dispatch. Dispatch is defined as when the aircraft first moves under its own power for the purpose of taking off. So the moment you push back or taxi out under your own power, that's dispatch — and all the planning minima must be satisfied up to that point. These definitions form the backbone of operational certification and fuel planning. Take them one at a time, and they'll make sense in context as we apply them later.