Does An Aircraft Have A Horn?

It Is A Question Most People Wouldn’t Think About. Would An Aircraft With Sophisticated Communication Systems Need A Horn? Truth Is, Every Commercial Airliner Has A Horn, As A Signalling System. This Horn Is Almost Never Used In Flight, But In On-Ground Maintenance. A Small Button Marked “GND” On The Instrument Panel In The Cockpit Sounds The Horn. The Airplane Horn Sounds Just Like An Old Steamboat’s Horn. Ground Engineers Working In The Cockpit Use It To Signal Their Colleagues On The Ground. The Ground Engineer Can Then Communicate Directly With The Cockpit. By Plugging In Headphones To A Jack Located Near The Front Landing Gear.

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Source: https://www.drivespark.com