OT: Sawing noise?
Dec 30, 2014, 9:01 am
#1
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OT: Sawing noise?
What's the noise that sounds like sawing?
Normally just before take off, or on arrival at the gate?
Comes from below the passenger deck.
Been meaning to ask for ages.
Normally just before take off, or on arrival at the gate?
Comes from below the passenger deck.
Been meaning to ask for ages.
Dec 30, 2014, 9:11 am
#4
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It is the power transfer unit. More information thanks to Wikipedia here
http://en.m.wikipedia.org/wiki/Power_transfer_unit
http://en.m.wikipedia.org/wiki/Power_transfer_unit
Dec 30, 2014, 9:33 am
#6
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It generally happens on the taxi out to the runway, and therefore coincides with the Crew/Auto safety demonstration. If it's the latter, this can often be completely inaudible. On one of my recent flights as nobody could possibly have heard it, and I almost got up and said that it should be played again, but by then of course it was "Cabin Crew seats for take-off". What would you have done in a similar situation, as it rendered the mandatory safety demo completely useless?
Dec 30, 2014, 10:16 am
#7
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It generally happens on the taxi out to the runway, and therefore coincides with the Crew/Auto safety demonstration. If it's the latter, this can often be completely inaudible. On one of my recent flights as nobody could possibly have heard it, and I almost got up and said that it should be played again, but by then of course it was "Cabin Crew seats for take-off". What would you have done in a similar situation, as it rendered the mandatory safety demo completely useless?
Dec 30, 2014, 10:19 am
#8
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It generally happens on the taxi out to the runway, and therefore coincides with the Crew/Auto safety demonstration. If it's the latter, this can often be completely inaudible. On one of my recent flights as nobody could possibly have heard it, and I almost got up and said that it should be played again, but by then of course it was "Cabin Crew seats for take-off". What would you have done in a similar situation, as it rendered the mandatory safety demo completely useless?
Dec 30, 2014, 10:20 am
#9
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Personally, I think it sounds more like stuck windscreen wipers but dog barking and sawing works for me too.
Dec 30, 2014, 10:24 am
#10
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I had this conversation a while ago with a bloke sitting next to me in the exit row of an EasyBus...
He reckoned it was related to the (apparently common) practice of taxiing almost to the threshold on only one engine "to save fuel", with the noise being the fuel pump working as the 2nd engine was started.
I thought is sounded like BS at the time, but was too polite to say anything but "Oh, how interesting..."
He reckoned it was related to the (apparently common) practice of taxiing almost to the threshold on only one engine "to save fuel", with the noise being the fuel pump working as the 2nd engine was started.
I thought is sounded like BS at the time, but was too polite to say anything but "Oh, how interesting..."
Dec 30, 2014, 10:44 am
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Dec 30, 2014, 10:53 am
#13
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I had this conversation a while ago with a bloke sitting next to me in the exit row of an EasyBus...
He reckoned it was related to the (apparently common) practice of taxiing almost to the threshold on only one engine "to save fuel", with the noise being the fuel pump working as the 2nd engine was started.
I thought is sounded like BS at the time, but was too polite to say anything but "Oh, how interesting..."
He reckoned it was related to the (apparently common) practice of taxiing almost to the threshold on only one engine "to save fuel", with the noise being the fuel pump working as the 2nd engine was started.
I thought is sounded like BS at the time, but was too polite to say anything but "Oh, how interesting..."
Whilst I don't think it's easyJet SOP to taxi out on one engine, I believe it's becoming more frequent. I've never encountered it on BA. There are potential problems with one engine taxi out- should there be a mechanical fault on the other one, it would cause various issues- taxiing back to stand would be hugely inconvenient for example, and cause delays to other aircraft. Other problems could include encountering a sharp turn in the direction to the other side (which would require increased power from the not-running engine).
Taxiing in after landing on one engine however is quite common practice, and possibly even BA SOP? One BA A320 family Captain I have spoken to said that he taxys back in on one engine regularly.
Perhaps Waterhorse will be able to shed more light.
