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Topic Author
Posts: 334
Joined: Fri Oct 06, 2000 6:52 am

Ding After Engine Start

Wed Oct 25, 2006 2:24 am

I have noticed on my recent flights that as soon as the engines are started there seems to be a ding in the cabin. Is this simply the system being switched over from aux. power (I would guess this), or is it a confirmation to the flight attendants from the flight deck?

Thanks for the replies.

Posts: 1023
Joined: Thu Jun 08, 2006 5:08 am

RE: Ding After Engine Start

Wed Oct 25, 2006 2:34 am

If it sounds similar to an F/A call button it's the pilots signaling that they want an F/A to pick up the intercom.
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Joined: Sun Oct 15, 2006 1:02 am

RE: Ding After Engine Start

Wed Oct 25, 2006 3:22 am

I would rather guess that it is sme sort if signal as the power supply changes from apu to engine power. Normally the "ding" is to hear after a short flicker of the lights (very short "loss" of power) which is due to the engines now being responsible for the oboard power.
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Joined: Wed Feb 28, 2001 10:31 pm

RE: Ding After Engine Start

Wed Oct 25, 2006 12:20 pm

Depends on the aircraft and the airline. Some aircraft may make that sound when the power is switched over. Or it can be an airline procedure.

For example at Qantas the Pilots will 'double ding' the cabin crew at no 1 engine start as a signal to start the safety demonstration.
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Joined: Tue Oct 28, 2003 12:37 pm

RE: Ding After Engine Start

Wed Oct 25, 2006 12:38 pm

As stated above, this is the switch from APU power through the transfer bus to engine generator power. Some a/c make a "ding or dong" and lights momentary flicker while other a/c just have the lights flicker for a sec.

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