As aircraft do not encounter traffic jams like land vehicles do, it makes sense that they do not require a horn. However, many people do not know this, but aircraft do have horns, just as any vehicle does on the ground. Pilots mainly use the horn to get the attention of the ground engineer, so they can talk on the intercom (by wearing a headset).
While horns aren’t used for alerting other aircraft during flight, they are a valuable communication tool while a plane sits in a hangar or undergoes maintenance. In most cases, an airplane’s horn is used by the ground engineers, performing maintenance/repair work in the cockpit and need to communicate with the ground crew.
The sound of an airplane horn is more similar to that of an alarm than to that of a car horn. An airliner’s horn was once recorded and posted as a video by KLM Airlines. According to the airline, when you press the button, “it sounds like three steamboats are passing under the plane.”
Read also: Aviation Explained: What is a nautical mile and why planes use it instead of kilometers
According to KLM Airlines, whereas car horns are used mainly as warning devices, aircraft horns are primarily practical tools used during aircraft maintenance. It can emit signals to warn engineers when a system malfunctions or if there is a fire.
When in flight, KLM says that the aircraft horn is not working because the signaling system is off.
Live TV
#mute
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nextload=false;
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nextpath="&page=" + pg;
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cat = "?cat=1176363";
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slot.setTargeting(t, targeting
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slot.addService(googletag.pubads());
googletag.display(elId);
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});
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fbid = '#' + $(this).attr('id');
var sr = fbid.replace("#mf", ".sr");
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fbcontainer = $(fbid).parent().children(sr).children(".fb-comments").attr("id");
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var ing, fid;
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if(_v != event){
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ing = new YT.get(_v);
if(ing.getPlayerState()=='1'){
ing.pauseVideo();
}
}
});
$('div[id*="video-"]').each(function(){
_v = $(this).attr('id');
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if(_v != event){
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}
});
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function onYouTubePlay(vid, code, playDiv,vx, pvid){
if (typeof(YT) == 'undefined' || typeof(YT.Player) == 'undefined') {
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
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onYouTubePlayer(vid, code, playDiv,vx, pvid);
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width: '100%',
videoId:code,
playerVars: {
'autoplay': 1,
'showinfo': 1,
'controls': 1
},
events: {
'onStateChange': function(event){
onPlayerStateChange(event.target.a.id);
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$("#video-"+vid).show();
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var nt=dt.getTime();
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doRegisterEvents(kalturaPlayer);
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kalturaPlayer.setMedia({
plugins: {},
sources: playbackType
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kalturaPlayer.addEventListener(kalturaPlayer.Event.Core.PAUSE, pauseEvent);
kalturaPlayer.addEventListener(kalturaPlayer.Event.Core.PLAYBACK_ENDED, playbackEndedEvent);
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kalturaPlayer.addEventListener(kalturaPlayer.Event.AD_COMPLETED, adCompletedEvent);
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kalturaPlayer.addEventListener(kalturaPlayer.Event.AD_CLICKED,adClicked);
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gtag('event', 'Play', { 'event_category': videotype, 'event_label': vlabel});
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var videotype = "zee english video";
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var videotype = "zee english video";
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$(this).hide();
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var playDiv = "video-" + vid + "-" + pvid;
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onYouTubePlay(vid, vC, playDiv,vx, pvid);
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$(this).hide();
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var playDiv = "mvideo-play-" + vid + "-" + pvid;
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//console.log(jwplayer($(this).attr("id")).getState());
kalturaPlayerAPIReady(vC, playDiv,pvid);
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onYouTubePlay($(this).attr("id"), vC, playDiv, vid, pvid);
}
});
var nxti = 3;
var ci = 1;
var nxti_1 = 6;
var nxti_2 = 9;
var nxti_3 = 12;
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var disqus_identifier; //made of post id and guid
var disqus_url; //post permalink
function loadDisqus(source, identifier, url, nid) {
if (window.DISQUS) {
//alert("if");
jQuery('
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jQuery('#disqus_thread').insertAfter(source); //append the HTML after the link
//if Disqus exists, call it's reset method with new parameters
DISQUS.reset({
reload: true,
config: function () {
this.page.identifier = identifier;
this.page.url = url;
}
});
}else{
jQuery('
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disqus_identifier = identifier; //set the identifier argument
disqus_url = url; //set the permalink argument
//append the Disqus embed script to HTML
var dsq = document.createElement('script'); dsq.type="text/javascript"; dsq.async = true;
dsq.src="http://" + disqus_shortname + '.disqus.com/embed.js';
jQuery('head').append(dsq);
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};*/
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function notify() {
identifier = $(this).attr('id');
dUrl = $(this).attr('disqus-url');
source = $(this).parent();
loadDisqus(jQuery(this), identifier, dUrl);
}*/
function loadshare(curl){
history.replaceState('' ,'', curl);
if(window.OBR){
window.OBR.extern.researchWidget();
}
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//$('html head').find('title').text("main" + nxtTitle);
if(_up == false){
var cu_url = curl;
gtag('config', 'UA-2069755-1', {'page_path': cu_url });
if(window.COMSCORE){
window.COMSCORE.beacon({c1: "2", c2: "9254297"});
var e = Date.now();
$.ajax({
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success: function(e) {}
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var ga = document.createElement('script'); ga.type="text/javascript"; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://' : 'http://') + 'stats.g.doubleclick.net/dc.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();*/
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var items_selector = content_selector + ' > div.rep-block'; // + settings.items_selector;
var pager_selector="div.next-story-block > div.view-zn-article-mc-all-2017 > div.view-content > div.clearfix"; // + settings.pager_selector;
var next_selector="div.next-story-block > div.view-zn-article-mc-all-2017 > div.view-content > div.clearfix > a:last"; // + settings.next_selector;
var auto_selector="div.tag-block";
var img_location = view_selector + ' > div.rep-block:last';
var img_path="
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var img = img_path;
//$(pager_selector).hide();
//alert($(next_selector).attr('href'));
var x = 0;
var url="";
var prevLoc = window.location.pathname;
var circle = "";
var myTimer = "";
var interval = 30;
var angle = 0;
var Inverval = "";
var angle_increment = 6;
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content: items_selector,
runscroll: maindiv,
link: next_selector,
autoLoad: false,
page: 0,
start: function(){
$(img_location).after(img);
circle = $('.center-section').find('#green-halo');
myTimer = $('.center-section').find('#myTimer');
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instagram_script.async="async";
instagram_script.src="https://platform.instagram.com/en_US/embeds.js";
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outbrain_script.type="text/javascript";
outbrain_script.async="async";
outbrain_script.src="https://widgets.outbrain.com/outbrain.js";
var Omain = $("#outbrain-"+ x);
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if (typeof (twttr) != 'undefined') {
twttr.widgets.load();
} else {
$.getScript('https://platform.twitter.com/widgets.js');
}
//$(twit).addClass('tfmargin');
}
if(insta>0){
$('.content > .left-block:last').after(instagram_script);
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window.instgrm.Embeds.process();
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}, 1500);
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x=$(next_selector).attr('id');
var url = $(next_selector).attr('href');
disqus_identifier="ZNH" + x;
disqus_url = url;
handle.autopager('load');
history.pushState('' ,'', url);
setTimeout(function(){
//twttr.widgets.load();
//loadDisqus(jQuery(this), disqus_identifier, disqus_url);
}, 6000);
});*/
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function disqusToggle() {
console.log("Main id: " + $(this).attr('id'));
}*/
$(document).delegate("button[id^='mf']", "click", function(){
fbcontainer="";
fbid = '#' + $(this).attr('id');
var sr = fbid.replace("#mf", ".sr");
//console.log("Main id: " + $(this).attr('id') + "Goodbye!jQuery 1.4.3+" + sr);
$(fbid).parent().children(sr).toggle();
fbcontainer = $(fbid).parent().children(sr).children(".fb-comments").attr("id");
//console.log(fbcontainer);
//var commentsContainer = document.getElementById(fbcontainer);
//commentsContainer.innerHTML = '
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});
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var title, imageUrl, description, author, shortName, identifier, timestamp, summary, newsID, nextnews;
var previousScroll = 0;
//console.log("prevLoc" + prevLoc);
$(window).scroll(function(){
var last = $(auto_selector).filter(':last');
var lastHeight = last.offset().top ;
//st = $(layout).scrollTop();
//console.log("st:" + st);
var currentScroll = $(this).scrollTop();
if (currentScroll > previousScroll){
_up = false;
} else {
_up = true;
}
previousScroll = currentScroll;
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var cutoff = $(window).scrollTop() + 64;
//console.log(cutoff + "**");
$('div[id^="row"]').each(function(){
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if($(this).offset().top + $(this).height() > cutoff){
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if(prevLoc != $(this).children().find('.left-block').attr('data-url')){
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$('html head').find('title').text($(this).children().find('.left-block').attr('data-title'));
$('meta[name=description]').attr("content",$(this).children().find('.left-block').attr('data-summary'));
$('meta[name=keywords]').attr("content",$(this).children().find('.left-block').attr('data-keyword'));
$('meta[name=news_keywords]').attr("content",$(this).children().find('.left-block').attr('data-keyword'));
pSUPERFLY.virtualPage(prevLoc,$(this).children().find('.left-block').attr('data-title'));
//console.log("Summary: " + $(this).children().find('.left-block').attr('data-summary'));
//console.log("Keyword: " + $(this).children().find('.left-block').attr('data-keyword'));
//history.pushState('' ,'', prevLoc);
loadshare(prevLoc);
}
return false; // stops the iteration after the first one on screen
}
});
if(lastHeight + last.height() < $(document).scrollTop() + $(window).height()){
//console.log("**get");
url = $(next_selector).attr('href');
x=$(next_selector).attr('id');
//console.log("x:" + x);
//handle.autopager('load');
/*setTimeout(function(){
//twttr.widgets.load();
//loadDisqus(jQuery(this), disqus_identifier, disqus_url);
}, 6000);*/
}
//lastoff = last.offset();
//console.log("**" + lastoff + "**");
});
//$( ".content-area" ).click(function(event) {
// console.log(event.target.nodeName);
//});
/*$( ".comment-button" ).live("click", disqusToggle);
function disqusToggle() {
var id = $(this).attr("id");
$("#disqus_thread1" + id).toggle();
};*/
//$(".main-rhs2433679").theiaStickySidebar();
var prev_content_height = $(content_selector).height();
//$(function() {
var layout = $(content_selector);
var st = 0;
///});
}
}
});
/*}
};*/
})(jQuery);
,