What does 2 dings mean on a plane?

Former pilot Bubb told Newsweek that two dings mean the plane is climbing through 10,000 feet and/or the pilots are asking flight attendants to prepare the cabin for landing. A whoosh sound means the landing gear is extending in preparation for landing, Bubb added.



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Two chimes are often used to indicate the aircraft is approaching 10,000 feet in altitude. A 3+ chime could be to tell the flight attendants to be seated NOW due to reports of turbulence that were just received by the pilots.

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Those 'Ding' Sounds You Hear In Flight Are A 'Secret' Code You're listening in on the cabin crew communicating. It is actually, the old 'no-smoking' sign dinging. You are hearing just after take off.

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The PTU has been described as a dog barking, a NASCAR tire lug gun or sawing. The noise is the normal sound the PTU makes when it powers one of the hydraulic systems. During taxi in, one engine is often shut down causing the PTU to power the opposite hydraulic system.

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Air traffic control units use the term squawk when they are assigning an aircraft a transponder code, e.g., Squawk 7421. Squawk thus can be said to mean select transponder code or squawking xxxx to mean I have selected transponder code xxxx.

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A Squawk 7700 indicates an emergency. This can be an emergency of any kind. Pilots may input it into the transponder themselves – or when instructed to do so by ATC. As a result, ground control will know that the aircraft is dealing with a serious issue and needs help.

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In aviation, the rule of three or 3:1 rule of descent is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent. For example, a descent from flight level 350 would require approximately 35x3=105 nautical miles.

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Some of the factors that airlines consider when deciding who gets bumped include check-in time, fare paid by the passenger, and frequent flyer status. It is important to note that these criteria must not be used in a way that prejudices or disadvantages any passenger unjustly or unreasonably.

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A Flight Attendant required by the Company to deadhead shall receive full pay and credit based on scheduled block time or actual flight time, whichever is greater. Additionally, all premiums will apply to the deadhead.

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Squawking 7700 in an emergency Reserved codes are used in particular situations when an aircraft wants to communicate something to ATC urgently. The most well know of these is the code 7700. This is used to indicate an emergency of any kind.

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The word heavy means a larger aircraft type, with a Maximum Takeoff Weight of 160 tonnes or more. These aircraft create wake turbulence from their wings and require extra separation between following aircraft, and the use of heavy reminds other pilots of that fact.

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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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1200: Visual Flight Rules (VFR) flight, this is the standard code used in North American airspace when no other has been assigned (*)

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All airplanes will be exposed to drag during flight. They must overcome this aerodynamic force to achieve and maintain lift. Otherwise, airplanes would essentially fall out of the sky. Air brakes are control surfaces that increase drag so that airplanes slow down during flight.

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