Rules of the Air — Page 133, Lesson 208

Let's dive into the signals area. This is a really practical part of air law — it's how an aerodrome talks to a pilot who has no radio, or whose radio has failed. Every one of these markings is a precise instruction, and in the exam you'll be given a written description of a sign and asked what it means, so we need to get each one exactly right. Let's start with the white "T". A white "T" displayed on the aerodrome means that take-offs and landings shall be in the direction of the shaft of the "T" — that's the long stem, shown by the arrow. So the "T" points the way you should be taking off and landing. Now, if a white disc is added to the "T", that changes the meaning. It tells you that the take-off and landing direction do not necessarily coincide. So the disc is a qualifier — the direction isn't fixed to match both. Next, a white dumb-bell. The dumb-bell shape — a bar with a circle at each end — indicates that aircraft movement on the ground is confined to paved, metalled, or similar hardened surfaces. So you stay on the hard surfaces. But if that white dumb-bell has black stripes on it, the meaning shifts. It signifies that take-offs and landings are to be on a runway, but movement on the ground is not confined to pavements. So you can taxi off the hard surface, but you must still use the runway for take-off and landing. Now a red and yellow striped arrow — that signifies that a right-hand circuit is in force. So the traffic pattern is right-hand, not the standard left-hand. A red panel with a yellow diagonal stripe signifies that the manoeuvring area is poor, and pilots must exercise special care. So it's a caution — the surface or area is degraded. A red panel with a yellow cross signifies that the aerodrome is unfit for aircraft movements, and landings are prohibited. That's a hard stop — you cannot land there. A white "H" signifies that helicopters shall take off and land only within the area designated by the marking. So the "H" marks the helicopter operating area. A red "L" over a dumb-bell means that light aircraft are permitted to take off and land either on a runway or on the area designated. So the "L" gives light aircraft that flexibility. A white double cross means that glider flying is in progress. So you need to be aware of glider activity. Now, two or more white crosses indicate that the section of the runway or taxiway — where they would be yellow crosses — is unfit for aircraft movement. And orange and white boundary markers will delineate the limit of the unusable ground or runway. So the crosses mark the bad area, and the boundary markers show exactly where it ends. Let's move to the holding points. Two yellow broken lines and two continuous lines signify the holding point closest to the runway. Outside of the notified hours for ATC, this is the closest point an aircraft or vehicle can approach to the runway for the purpose of giving way to aircraft landing or taking off. This is a 'pattern A' marking. Then a yellow 'ladder' marking across the taxiway indicates a holding point other than the closest to the runway. Outside ATC hours it can be ignored. This is a 'pattern B' marking. So pattern A is the critical one — it's the closest you can get when ATC isn't active. A black letter "C" on a yellow background indicates where a visiting pilot should report on arrival. So that's your reporting point. A yellow St George's cross indicates the position on the manoeuvring area where tow ropes and banner can be dropped. That's for glider towing operations. Now, moving to the signals mast. The signals mast flies signals — these are the ones flown from the mast itself, as opposed to the ground markings. Then we have QDM boards. A yellow board with two black numbers on it is situated on the tower, and indicates the runway direction in use — that's the QDM. QDM is the magnetic heading to the station, so the numbers tell you the runway direction in use. Boundary markers — orange and white striped markers indicate the boundary of the manoeuvring area where it is not clearly defined. So they mark the edge of the manoeuvring area. Finally, the wind sleeve — the windsock. It indicates wind direction and speed. The size of the sleeve tells you the speed: large equals 40 knots, medium equals 30 knots, small equals 20 knots. And the way it hangs tells you the wind — a fully extended sleeve is max wind speed, half extended is half wind speed, and hanging limp is calm. Let me show you the figures for these — they'll make it much clearer. So the key thing to remember is that each of these signals is a precise, unambiguous instruction — the "T" for direction, the dumb-bell for surface restrictions, the red panels for prohibitions and cautions, the crosses for unusable areas, and the holding point markings for where you can and cannot go. And the windsock gives you both direction and speed through its size and extension.