EU-OPS 1 - Extract 1 — Page 17, Lesson 17

I want to walk you through the official procedure for establishing revised standard mass values for passengers and baggage, straight from Appendix 1 to OPS 1.620(g) under EU-OPS 1. This is the regulatory backbone for how an operator can move away from the published standard passenger masses and derive their own, based on actual weighing surveys. Let's start with the big picture. The regulation gives you two ways to get passenger masses: either you use the standard values the authority publishes, or you conduct a survey to establish your own revised values. This appendix is the rulebook for that second path. And it splits the whole procedure into two halves — passengers first, then baggage. We're going to work through the passenger side in detail. The first method is the weight sampling method. The idea is simple: you determine the average mass of passengers and their hand baggage by actually weighing people, but you don't weigh everyone — you take random samples. Now, the critical word here is random, and the regulation is very precise about what makes a sample acceptable. The selection of random samples must, by its nature and extent, be representative of the passenger volume. That means your sample has to reflect the real mix of traffic you carry. So you must consider the type of operation — are you short-haul or long-haul? The frequency of flights on various routes — do you fly some sectors daily and others weekly? You must consider inbound and outbound flights — both directions, not just one. You must consider the applicable season — summer versus winter traffic can differ in mass. And you must consider the seat capacity of the aeroplane — because a 50-seat turboprop and a 300-seat widebody carry different passenger profiles. All of these factors must be reflected in how you pick your sample, so the average you calculate genuinely represents your operation. Next comes sample size. This is where the regulation gets quantitative, and I want you to note the exact wording: the survey plan must cover the weighing of at least the greatest of two things. That phrase — the greatest of — is crucial. You don't get to pick the smaller one; you must satisfy whichever requirement is larger. The first requirement is a number of passengers calculated from a pilot sample, using normal statistical procedures, and based on a relative confidence range — accuracy — of 1% for all adult average masses, and 2% for separate male and female average masses. Let me unpack that. A pilot sample is a small initial weighing you do to estimate the variability of passenger masses in your operation. You feed that variability into standard statistical formulas to compute how many passengers you need to weigh so that your final average is accurate to within 1% for the combined adult average, or within 2% if you're computing separate male and female averages. The tighter the accuracy target, the larger the sample you need — that's why the adult figure is 1% and the separate-gender figure is 2%; the separate averages are allowed to be a little less precise. The second requirement is a fixed minimum based on aeroplane size. For aeroplanes with a passenger seating capacity of 40 or more, you must weigh a total of 2,000 passengers. For aeroplanes with a seating capacity of less than 40, you must weigh a total number equal to 50 multiplied by the passenger seating capacity. So a 30-seat aircraft would require 50 times 30, which is 1,500 passengers. And remember — you take the greatest of the statistical number and this fixed number. If your statistics say you need 2,500, you weigh 2,500. If they say 1,200 but you operate a 200-seat aircraft, the fixed rule forces you up to 2,000. Now, what exactly counts as a passenger mass? The regulation states that passenger masses must include the mass of the passengers' belongings which are carried when entering the aeroplane. So hand baggage, coats, personal items — anything they carry on board — is part of the measured mass. And there's a specific rule for infants: when you take random samples, infants shall be weighed together with the accompanying adult. You don't weigh the infant separately; the infant's mass is captured as part of the adult they travel with. The appendix also cross-references OPS 1.620(c), (d), and (e) — those are the related provisions that govern how these revised values are actually applied, and you'll want to read them alongside this appendix for the full picture. Next, the weighing location. This is a practical detail with a real purpose. The location for weighing passengers shall be selected as close as possible to the aeroplane, at a point where a change in passenger mass by disposing of or acquiring more personal belongings is unlikely to occur before boarding. Think about why: if you weigh someone at the check-in desk and they then buy a heavy bottle of water or a book at the duty-free shop, the mass you recorded no longer matches what they carry onto the aircraft. So you place the scales near the boarding point, where passengers have already finished acquiring or discarding belongings, to keep the measured mass valid for the flight. Finally, the weighing machine. The machine used for passenger weighing must have a capacity of at least 150 kg. That's the minimum — it has to be able to handle the heaviest passenger you might weigh. The excerpt cuts off mid-sentence at "The mass s…", but the capacity requirement is the key point I want you to hold onto: a minimum capacity of 150 kilograms for the passenger scale. So let me tie this together. To establish revised standard passenger masses, you run a survey that weighs a random, representative sample of passengers with their carried belongings, at a location close to the aircraft, on a scale capable of at least 150 kg. Your sample size must be the greater of a statistically derived number — accurate to 1% for all adults and 2% for separate male and female averages — or a fixed minimum of 2,000 passengers for aircraft of 40 seats or more, or 50 times the seat capacity for smaller aircraft. Infants are weighed with their accompanying adult. That's the passenger half of the procedure. The baggage half follows in the next part of the appendix, and we'll pick that up when we get there.