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Here are some types of lights:
A beacon is a light that flashes slowly.
Strobes are the bright white lights that flash about once per second.
Navigation lights are the red, green, and white lights that are on continuously, like on a boat.
Logo lights are lights used to light up something on the side of the plane, and their use is optional.
Strobes and beacons are considered anti-collision lights.
Anti-collision lights, if the plane has them, should be used whenever the engine is running except when they interfere with ground operations. Strobes do not have to be used all the time if a beacon is on.
Navigation lights should be used during night operations.
Ultralight vehicle cannot be flown except between the hours of sunrise and sunset.
Ultralight vehicles may be operated during the twilight periods 30 minutes before official sunrise and 30 minutes after official sunset or, in Alaska, during the period of civil twilight as defined in the Air Almanac, if:
The vehicle has an operating anti-collision light visible for at least 3 statute miles
The flight is only in uncontrolled airspace
Ultralight vehicles cannot be flown over any congested area of a city, town, or settlement, or over any open air assembly of persons.
Weight allowances can be made for amphibious landing gear, and ballistic parachute systems.
In the United States, while no license or training is required by law for ultralights, training is highly advisable.
originally posted by: Nickn3
I would guess a Cessna 172 rigged for slow flight, slow controled speed, very quiet. Below 1500 AGL the VFR pilot can be very close to a controlled airport and not be talking to the tower. Not recommended but legal. Think up side down wedding cake.
If the field is not controlled all bets are off and anything is possible. He may have been trying to use his radio to turn on the field lights. I myself once stalled a Warrior over Jim Lovell Field trying to turn the lights on. Slow flight is a common practice to loiter over an area.
originally posted by: Timely
reply to: AboveBoard
There is no reason an electric motor could not be fitted to an ultralight.
The only sound you would hear is the prop. and you would need to be right behind it to hear anything but wind.
Again, thinking of stealthy law breakers ...