'Double Bings' - When, What & Why Not?

Old Jul 9, 17, 12:21 pm
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Wink 'Double Bings' - When, What & Why Not?

Hey all,

Quick question - despite flying long haul at least twice a month I still find myself an extremely anxious traveller (until I've had a few glasses of champers of course) and have come to rely on the routine I experience on BA vs other airlines for comfort.

Yesterday (seated in J) leaving Dubai we had an extremely long taxi for take off - I was feeling quite unwell after a heavy night out (self inflicted) and was finding myself getting more and more anxious. As we taxied onto the runway there was no 'double bing' that I've gotten used to over the years and after a long take off roll (normal in the DXB heat) there was also no 'double bing'. Having all my recent flights on 747 or A380 I had forgotten how noisy it is sitting directly over the wing on a 777 which only added to the anxiety I was having during the long slow climb - my mind running riot about the fact there was no 'bing' and my raging hangover only sending my mind into further overdrive!!

I know its crazy but just wondered why as I assumed it was to notify the crew of taxing onto an active runway and secondly to notify on 'wheels up'. Is it normal procedure in any situation to have no 'bing'. Just interested in anyones opinions / fact.

Thanks - and despite numerous attempts to make the latest 'DO's' I do hope to finally be at the next one to have all of my irrational questions answered in person
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Old Jul 9, 17, 12:29 pm
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The Airbus has an automatic one bing on gear up and gear down. It's part of the cabin information system. The double bing on runway entry for takeoff is done by the pilots, but you'll notice the SCCM will have made the "cabin crew seats for takeoff/landing" well before that point.

With the boeings there is no cabin bing on gear down and gear up.
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Old Jul 9, 17, 12:31 pm
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I can't remember a BA flight I've been on that didn't have the double bing before take off.

Would be interesting to hear if it's a checklist item or just part of BA SOP.
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Old Jul 9, 17, 12:32 pm
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I think the clue lies in the "long taxi". You're quite right that the double bing advises the crew the aeroplane is entering the live runway and tells them to get strapped into their seats.

However, the pilot in charge of the sector will have briefed the crew thus "I'll sound a double chime when we enter the runway and you need to bucke up at that point." It may well be that on the briefing of your flight, the pilot had told them "We have a bit of a wait before pushback, so get your safety demo out of the way and your cabin checks done and then strap in. We have a long taxi, so we won't need to sound the chimes."
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Old Jul 9, 17, 12:33 pm
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Originally Posted by KARFA View Post
The Airbus has an automatic one bing on gear up and gear down. It's part of the cabin information system.
Curiously, what else does the cabin information system do? Is exit lights on gear down part of the same system?
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Old Jul 9, 17, 12:39 pm
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Originally Posted by KARFA View Post
The Airbus has an automatic one bing on gear up and gear down. It's part of the cabin information system. The double bing on runway entry for takeoff is done by the pilots, but you'll notice the SCCM will have made the "cabin crew seats for takeoff/landing" well before that point.

With the boeings there is no cabin bing on gear down and gear up.
Ok good to know although on my 747 departure from LHR earlier in the week we had 'double bing' immediately after rotation.
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Old Jul 9, 17, 12:55 pm
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Originally Posted by CloudGazer View Post
Curiously, what else does the cabin information system do? Is exit lights on gear down part of the same system?
Yes, it happens at the exact same time as the relevant "bing". Just like when the lights turn off after gear up.
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Old Jul 9, 17, 12:56 pm
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Originally Posted by KARFA View Post
The Airbus has an automatic one bing on gear up and gear down. It's part of the cabin information system. The double bing on runway entry for takeoff is done by the pilots, but you'll notice the SCCM will have made the "cabin crew seats for takeoff/landing" well before that point.

With the boeings there is no cabin bing on gear down and gear up.
Ha - I was nervous the other day from LCY - we were actually on the runway and lined up and the CSM was still being busy - a chap in 1A told her we were on the runway but she put all her faith into the 'double bing' - the other day from LGW we took off and there was no double bing so I guess that was a bit of a risk!

I was nervous for her - I know LCY is tight but I have never seen someone faff as much as she did before take off !

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Old Jul 9, 17, 1:08 pm
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Originally Posted by aks120 View Post
Ha - I was nervous the other day from LCY - we were actually on the runway and lined up and the CSM was still being busy - a chap in 1A told her we were on the runway but she put all her faith into the 'double bing' - the other day from LGW we took off and there was no double bing so I guess that was a bit of a risk!

I was nervous for her - I know LCY is tight but I have never seen someone faff as much as she did before take off !

aks120
Yikes ! Clearly she's as reliant on the 'double bing' as I am haha!
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Old Jul 9, 17, 1:09 pm
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You didn't hear a double ding but a slight chime which would have be the auto no smoking sign going off it it hadn't been switched to off.
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Old Jul 9, 17, 1:11 pm
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Originally Posted by aks120 View Post
Ha - I was nervous the other day from LCY - we were actually on the runway and lined up and the CSM was still being busy - a chap in 1A told her we were on the runway but she put all her faith into the 'double bing' - the other day from LGW we took off and there was no double bing so I guess that was a bit of a risk!

I was nervous for her - I know LCY is tight but I have never seen someone faff as much as she did before take off !

aks120
I thought there was a cabin secure signal which gets sent by the cc to the flight deck? If the pilots haven't seen that I would have assumed they would not have lined up?
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Old Jul 9, 17, 1:12 pm
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Originally Posted by Can I help you View Post
You didn't hear a double ding but a slight chime which would have be the auto no smoking sign going off it it hadn't been switched to off.
And all this time I've been revelling in the safety of the 'bing' after take off on a 747 when in fact it means 'feel free to light up' haha !
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Old Jul 9, 17, 1:12 pm
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The double ding isn't a sign to tell the crew that they should be seated, the SCCM sends a message to the flight crew that the cabin is secure and the crew are seated.
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Old Jul 9, 17, 1:16 pm
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Originally Posted by Can I help you View Post
The double ding isn't a sign to tell the crew that they should be seated, the SCCM sends a message to the flight crew that the cabin is secure and the crew are seated.
Ok thanks for the insight - what is the 'double bing' actually for then? Im so used to hearing it on entering the runway and on 'wheels up' - maybe I had just assumed the meaning. Does it have any relevance to you as a crew member when you hear it?

Thanks as always for the insight.

C
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Old Jul 9, 17, 1:17 pm
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Originally Posted by KARFA View Post
I thought there was a cabin secure signal which gets sent by the cc to the flight deck? If the pilots haven't seen that I would have assumed they would not have lined up?
That would explain why we sat on the runway for a while and when we went we really went - the best LCY T/O I have ever had - brakes on high engine (full aircraft) shot off the blocks and climbed like a bird - I loved it!

Regards

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