All Weather Operations — Page 56, Lesson 85

I want to walk you through the start of Chapter 5, which is all about All Weather Operations. This is a critical chapter because it sets the rules for operating an aircraft when the weather is poor — low cloud, fog, rain, reduced visibility. As a professional pilot, you need to know these minima inside out. Let's begin with the chapter outline. The introduction kicks things off on page 53, and then we move straight into Aerodrome Operating Minima: Operator’s Responsibility. That means the operator — the airline or company — has the duty to establish the minimum weather conditions under which they will allow an approach or take-off at a given aerodrome. It's not left to the pilot alone; the operator sets the baseline. Next we have Classification of Aeroplanes. Aircraft are grouped into categories based on their approach speed — that classification determines which minima apply to them. Then we get into Low Visibility Operations - General Operating Rules. These are the overarching rules that govern any operation when visibility is reduced, whether for take-off, approach, or landing. Then comes Terminology — a section that defines all the key terms you'll need. After that, Take-off Minima — the minimum weather conditions required to legally begin a take-off. That's followed by Visual Reference, which explains what visual cues you must have in sight to continue an approach or landing. Then we have Required RVR/Visibility. RVR stands for Runway Visual Range — it's a more precise measurement of visibility along the runway, reported in metres. This section tells you what RVR values are needed for different phases of flight. There's a subsection called Figure 5.2 Exceptions on page 59, which covers special cases where the standard minima don't apply. Then we move into Low Visibility Ops - Aerodrome Considerations — what the aerodrome itself must have in terms of lighting, markings, and procedures to support low visibility operations. That's followed by Low Visibility Ops - Training and Qualifications — what training the flight crew must have completed. Then Low Visibility Ops - Operating Procedures — the specific procedures to follow during these operations. And Low Visibility Ops - Minimum Equipment — the aircraft equipment that must be serviceable. Next we have System Minima — the minimum weather conditions tied to the performance of the aircraft's systems. Then Non-precision Approach — an approach that uses lateral guidance but not vertical guidance, like a VOR or NDB approach. For that, we have Minimum Descent Height, or MDH — the lowest altitude you may descend to without having the required visual reference. Then Visual Reference again, and Required RVR for non-precision approaches. After that, we break into precision approaches, which are ILS-based. First, Precision Approach - Category I Operations — that's a standard ILS approach with a decision height of 200 feet and an RVR of 550 metres or more. Then Category II Operations — lower minima, with a decision height below 200 feet but not less than 100 feet, and lower RVR. Then Category III Operations — the lowest of all, with very low or even zero decision height and very low RVR. There's a subsection on No Decision Height Operations — that's Category IIIc, where you have no decision height at all; you land purely on the autopilot and guidance systems. Then Visual Reference for Category III, and Category III RVR Requirements — the specific RVR values needed for each sub-category. Then we have Circling — an approach where you align with a runway other than the one you originally approached, using visual manoeuvring. Visual Approach — an approach conducted under visual flight rules, where you navigate by visual reference to the ground. VFR Operating Minima — the minimum weather conditions for flight under Visual Flight Rules. And finally Special VFR — a clearance to operate in controlled airspace in weather below standard VFR minima, but still with some visual reference. That's the full structure of the chapter. We'll work through each section in detail as we go.