What is the red line on an aircraft?

The radial red line near the bottom of green arc indicates Vmc, the minimum indicated airspeed at which the aircraft can be controlled with the critical engine inoperative.



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SQUAWKing is the process of communicating between the air and the ground, the process is essential for keeping planes in the air safe and ensuring a smooth and manageable air traffic control process, both for pilots and air traffic controllers.

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Strobe lights. All modern aircraft also have white flashing strobe lights on the rear wingtips. These are the flashing white lights you see if you look at aircraft in the night sky. These are for collision avoidance, simply to make the aircraft more visible.

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Lights on Aircraft These lights are often referred to as anti-collision lights and are located on the bottom of the plane, flashing red or white. Another set of lights to make the aircraft noticeable are position lights, located on each wing.

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If you fail a color vision test, you can still become a pilot. However, you'll be limited to daytime operations and won't be able to fly at night or accept ATC color signals.

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The 3 Must-Know Aircraft Emergency Squawk Codes For Pilots
  • 7700 – Distress or Urgency Condition. Before we begin discussing emergencies, let's define our terms as listed in the Pilot/Controller Glossary. ...
  • 7600 – Two-Way Radio Communication Failure (NORDO) ...
  • 7500 – Air Piracy (Hijacking or Hostile Acts Onboard)


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Currently, the bragging rights for the longest flight in the world belong to Singapore Airlines' New York City to Singapore route. Its longest flight path, which connects Singapore's Changi Airport with New York's John F. Kennedy International Airport, 9,585 miles away, takes 18 hours and 40 minutes.

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The first emergency code that you may have become familiar with is Squawk 7500. This code is used to indicate that the aircraft has been hijacked, and therefore requires urgent emergency support from both security services and air traffic control.

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Pan-Pan, short for “possible assistance needed,” is used to communicate an urgent, but not emergency, situation over VHF radio, in the case of aviation, to air traffic control. Examples could include a recreational pilot getting lost, or perhaps needing to climb to a higher altitude to sort a problem out.

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Squawking 7500 signifies an aircraft being hijacked and could result in an aircraft being escorted by military forces.

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The squawk code 7500 is an emergency code used by pilots to inform ATC of a plane hijacking taking place, which means that the pilots have either been forced to change course or are no longer in control of the aircraft.

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Squawk 1000 is a code assigned by air traffic control to indicate that an aircraft is experiencing an emergency.

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During those days, the word liftoff was used. In more recent books, rotation became the standard term, essentially replacing liftoff. The terminology used by pilots is consistent, and it is explicitly chosen so that it will not cause any possible confusion with any other term used in the industry.

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Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder. (Codes 2001 to 2077 are available for domestic purposes.) Series 75 — Code 7500 is reserved for recognizing an aircraft subject to unlawful interference.

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Yes, airplane pilots can wear glasses. (And many do.) If you wear eyeglasses or contact lenses, you can still become a commercial, private, or military pilot.

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