Single-engine Class B - Climb — Page 308, Lesson 386

Let's pick up right where the take-off requirements left off and move into the climb performance for a single-engine Class B aeroplane. This is a really interesting part of the regulations because, on the surface, it looks like the rules are incredibly relaxed — almost dangerously so. But there's a very specific reason behind it, and I want you to understand that logic, because it's exactly the kind of thing an examiner will probe. The climb requirements for this class of aeroplane are stated in EU-OPS, but the practical, usable data is found in CAP 698, in section 2, on page 6. Now, at the top of that page, under point 3.1, we read something quite striking: there are no obstacle clearance limits, and there is no minimum acceptable climb gradient for this class of aeroplane. Let's break that down into its two parts, because each one has a distinct rationale. First, the obstacle clearance. The regulation states there is no requirement for a single-engine Class B aeroplane to demonstrate that it can clear an obstacle within the take-off flight path. Now, contrast that with other classes of aeroplane, which must demonstrate they can clear obstacles by a set limit — either 50 ft or 35 ft. So why the exemption? The key lies in the fundamental operating principle of a Class B aeroplane: the pilot must, at all times, have visual contact with the ground. Because of that, the pilot can always see an obstacle in the take-off path and can therefore avoid it. The safety margin isn't built into a calculated flight path; it's built into the pilot's eyes. That said, I'd still judge it prudent to carry out an obstacle clearance calculation if you know there are obstacles in the take-off flight path — the regulation doesn't require it, but good airmanship might. Now the second part: there is no minimum acceptable climb gradient. Again, this seems to fly in the face of the operational regulations' purpose of enforcing a safety margin. But the reason is that the climb performance isn't governed by operational rules — it's governed by the certification specifications for this type of aeroplane. The safety margin is baked in at the certification stage, not the operational stage. So, to tie it together: for a single-engine Class B aeroplane, you have no regulatory obstacle clearance limit and no regulatory minimum climb gradient. The protection comes from two sources — the pilot's mandatory visual contact with the ground, and the certification standards that the aeroplane type itself must meet. That's the complete picture for the climb performance requirements.