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Ding After Engine Start  
User currently offlineScaredflyer21 From United States of America, joined Oct 2000, 355 posts, RR: 0
Posted (7 years 5 months 3 weeks 6 days 18 hours ago) and read 2045 times:

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.

Scaredflyer21

4 replies: All unread, jump to last
 
User currently offlineN353SK From United States of America, joined Jun 2006, 792 posts, RR: 0
Reply 1, posted (7 years 5 months 3 weeks 6 days 17 hours ago) and read 2022 times:

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.

User currently offlineJetSetter001 From Germany, joined Oct 2006, 31 posts, RR: 0
Reply 2, posted (7 years 5 months 3 weeks 6 days 17 hours ago) and read 1925 times:

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.

User currently offlineMiami1 From Australia, joined Feb 2001, 706 posts, RR: 0
Reply 3, posted (7 years 5 months 3 weeks 6 days 8 hours ago) and read 1676 times:

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.


User currently offlineAmazonphil From United States of America, joined Oct 2003, 561 posts, RR: 1
Reply 4, posted (7 years 5 months 3 weeks 6 days 7 hours ago) and read 1647 times:

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.

Rgs,



If it ain't Boeing, I ain't goeing!
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