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Exercise extreme caution.
If your aircraft is on the ground, a steady red light from the control tower light gun means STOP. If you are airborne, a steady red light means to give way to other aircraft, and continue circling.
Congratulations! You have a virus. (:
The power supply unit must be toasted.
It is a warning light to pilots in poor visibility that there is a tall building there
It means get off the runway now, or, if flying, do not land here.
Exercise extreme caution
Signal Tower Museum was created in 1813.
If you mean the light gun signals from the control tower- to vehicles, and aircraft on the ground, get off the runway. For aircraft in flight, runway is unsafe, do not land.
Ground - Cleared for Takeoff. Air - Cleared to Land.
The friend sees the 2 lanterns from the church glimmer and then a gleam of light which is the signal light.
For an aircraft on the ground, it means that you are cleared for taxi. For an aircraft in flight, you must return for landing or go around and attempt landing again.