It is a routine practice for flight attendants to ask passengers on board an airplane to switch off or put their smart devices on flight mode. This warning is repeated with all seriousness, especially when the plane if taking-off or about to land.
When the plane has taken off and gained stability in the air, those who have their devices off can switch it on, but it is still recommended that they put it in flight mode.
The shortest answer a passenger will get from a flight attendant is a failure to switch off will result into the device’s signals interfering with the plane’s electrical and telecommunication systems. So, the next question will be, if the signals interfere with the plane’s communication systems, what will happen next? Can it cause a malfunction, or even lead to the plane crash? The attendant might not be able to give a detailed answer to these questions, so let us now hear what the experts have to say.
According to aviation experts, there is no evidence that signals from passengers’ electronic devices have ever caused a plane to malfunction and crash. The experts say that the reason for prospective safety concerns on the devices is due to when you are more than 10,000 feet in the air, your cell phone signal bounces off multiple towers, sending out a stronger signal. This is something that might congest the networks on the ground.
A pilot wrote in a blog post for Airline Updates that transmitting mobiles can cause audible interference on an aircraft’s radios, saying that it is not that a critical safety concern.
“Your phone will probably annoy a few pilots and air traffic controllers. But, most likely, not badly enough for them to take action against you if that’s what you want to know. You may have heard that unpleasant noise from an audio system that occasionally happens when a mobile phone is nearby. I actually heard such noise on the radio while flying. It is not safety critical, but is annoying for sure,” the pilot wrote.
“Your phone will probably annoy a few pilots and air traffic controllers. But, most likely, not badly enough for them to take action against you if that’s what you want to know. You may have heard that unpleasant noise from an audio system that occasionally happens when a mobile phone is nearby. I actually heard such noise on the radio while flying. It is not safety critical, but is annoying for sure,” the pilot wrote.
According to the pilot, those problems are something like the noise that can be heard when a Smartphone rings near to a speaker: A slow, percussive thumping. But instead of coming out of a speaker, it can be heard through the headsets that are worn by pilots.
He adds that if 50 people on board the plane did not turn their Smartphone to flight mode, it would cause a lot of radio pollution, admitting that there has never been a case of a Smartphone or any device causing a plane to crash.
An aeronautics engineer named Coenraad Loubser explains further on the issue: “To compound matters, the weaker the signal your cell phone picks up from the tower, the more it amplifies its signal to try and get a response (and the more battery it uses). Planes with onboard cell coverage, allow your phone to communicate using very low power, or Wi-Fi. When you put your phone in Airplane mode, the GSM/3G Radio inside your phone is completely disabled and you can still use the phone for other functions.”
So, now you know why you are being asked to put your phone on flight mode while on board a flight. You also know the consequences of failing to do so. We advise that when you are flying, always stick to the rules onboard.
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