What is that whining sound aboard an inflight 747?

[Alan[_4_]]

Several times for the past few years, while on a transatlantic flight
aboard a KLM 747-400, I begin to hear what sounds like a turbine
spinning up, almost like an engine start, but higher pitch...
Anyone know what it might be?

Thanks

[Bertie the Bunyip[_19_]]

Alan > wrote in news:350bbf41-1810-4363-8323-
:

> Several times for the past few years, while on a transatlantic flight
> aboard a KLM 747-400, I begin to hear what sounds like a turbine
> spinning up, almost like an engine start, but higher pitch...
> Anyone know what it might be?
>


It's the Captain whining about his perdiums.

Or it might be one of the electric hydraulic pumps.


Bertie

[Mxsmanic]

Alan writes:

> Several times for the past few years, while on a transatlantic flight
> aboard a KLM 747-400, I begin to hear what sounds like a turbine
> spinning up, almost like an engine start, but higher pitch...
> Anyone know what it might be?

At what point in the flight? And in which seat?

[Bertie the Bunyip[_19_]]

Mxsmanic > wrote in
:

> Alan writes:
>
>> Several times for the past few years, while on a transatlantic flight
>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
>> spinning up, almost like an engine start, but higher pitch...
>> Anyone know what it might be?
>
> At what point in the flight? And in which seat?
>

Why, you going to book next to him and whine the whole way?


Bertie

[Jim Stewart]

Bertie the Bunyip wrote:
> Mxsmanic > wrote in
> :
>
>> Alan writes:
>>
>>> Several times for the past few years, while on a transatlantic flight
>>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
>>> spinning up, almost like an engine start, but higher pitch...
>>> Anyone know what it might be?
>> At what point in the flight? And in which seat?
>>
>
> Why, you going to book next to him and whine the whole way?

What's the difference between a jet engine
and Anthony?

[[email protected]]

On Jan 14, 10:26 am, Alan > wrote:
> Several times for the past few years, while on a transatlantic flight
> aboard a KLM 747-400, I begin to hear what sounds like a turbine
> spinning up, almost like an engine start, but higher pitch...
> Anyone know what it might be?
>
> Thanks

Might be the air cycle machine. See this:

http://en.wikipedia.org/wiki/Air_cycle_machine

Dan

[Bertie the Bunyip[_19_]]

Jim Stewart > wrote in news:LpadncVg6P9-
:

> Bertie the Bunyip wrote:
>> Mxsmanic > wrote in
>> :
>>
>>> Alan writes:
>>>
>>>> Several times for the past few years, while on a transatlantic flight
>>>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
>>>> spinning up, almost like an engine start, but higher pitch...
>>>> Anyone know what it might be?
>>> At what point in the flight? And in which seat?
>>>
>>
>> Why, you going to book next to him and whine the whole way?
>
> What's the difference between a jet engine
> and Anthony?
>

Umm, lessee.

Ah go on, I won't ruin it for you..

Bertie

[Bertie the Bunyip[_19_]]

wrote in news:b7f23917-54a3-4227-a8cf-
:

> On Jan 14, 10:26 am, Alan > wrote:
>> Several times for the past few years, while on a transatlantic flight
>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
>> spinning up, almost like an engine start, but higher pitch...
>> Anyone know what it might be?
>>
>> Thanks
>
> Might be the air cycle machine. See this:
>
> http://en.wikipedia.org/wiki/Air_cycle_machine
>

Mm, they sort of hum more than whine, and the fans for the heat exchanger
are off when the flaps are up anyway.

It's either the hydraulic pumps, or if they're coming on and off in flight,
he probably means the flap motors.
In cruise nothing would be going on or off, though.


Bertie

[Robert M. Gary]

On Jan 14, 11:05*am, Mxsmanic > wrote:
> Alan writes:
> > Several times for the past few years, while on a transatlantic flight
> > aboard a KLM 747-400, I begin to hear what sounds like a turbine
> > spinning up, almost like an engine start, but higher pitch...
> > Anyone know what it might be?
>
> At what point in the flight? *And in which seat?

Do you have the seat schematics for different airlines?

-Robert

[Dave[_3_]]

Good questions..

With these additional important details, someone may be able to offer
good suggestions...

Dave




On Mon, 14 Jan 2008 20:05:26 +0100, Mxsmanic >
wrote:

>
>At what point in the flight? And in which seat?

[george]

On Jan 15, 8:58 am, Jim Stewart > wrote:

> What's the difference between a jet engine
> and Anthony?

You can shut a turbine down

[Jim Stewart]

george wrote:
> On Jan 15, 8:58 am, Jim Stewart > wrote:
>
>> What's the difference between a jet engine
>> and Anthony?
>
> You can shut a turbine down

And it stops whining.

[Mxsmanic]

Robert M. Gary writes:

> Do you have the seat schematics for different airlines?

They are easy to look up.

[Bertie the Bunyip[_19_]]

Mxsmanic > wrote in
:

> Robert M. Gary writes:
>
>> Do you have the seat schematics for different airlines?
>
> They are easy to look up.
>

So what?


you still don't know anythign about how a 747 is put together.


Bertie

[C J Campbell[_1_]]

On 2008-01-14 11:58:30 -0800, Jim Stewart > said:

> Bertie the Bunyip wrote:
>> Mxsmanic > wrote in
>> :
>>
>>> Alan writes:
>>>
>>>> Several times for the past few years, while on a transatlantic flight
>>>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
>>>> spinning up, almost like an engine start, but higher pitch...
>>>> Anyone know what it might be?
>>> At what point in the flight? And in which seat?
>>>
>>
>> Why, you going to book next to him and whine the whole way?
>
> What's the difference between a jet engine
> and Anthony?

A jet engine actually produces useful energy?
--
Waddling Eagle
World Famous Flight Instructor

[Jim Stewart]

C J Campbell wrote:
> On 2008-01-14 11:58:30 -0800, Jim Stewart > said:
>
>> Bertie the Bunyip wrote:
>>> Mxsmanic > wrote in
>>> :
>>>
>>>> Alan writes:
>>>>
>>>>> Several times for the past few years, while on a transatlantic flight
>>>>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
>>>>> spinning up, almost like an engine start, but higher pitch...
>>>>> Anyone know what it might be?
>>>> At what point in the flight? And in which seat?
>>>>
>>>
>>> Why, you going to book next to him and whine the whole way?
>>
>> What's the difference between a jet engine
>> and Anthony?
>
> A jet engine actually produces useful energy?

Well, that too. I was thinking of the flight attendant
punchline. Which is the whining doesn't stop when
it's shut down.

[Gerald S.]

Alan wrote:
> Several times for the past few years, while on a transatlantic flight
> aboard a KLM 747-400, I begin to hear what sounds like a turbine
> spinning up, almost like an engine start, but higher pitch...
> Anyone know what it might be?

could be quite a few times. A wild guess on my part....the motors that
close the luggage doors often make a high pitch whine and that would be
before engine start. Those don't wind up/down and are pretty much on or
off.

Gerald

[Jon]

On Jan 14, 9:02 pm, C J Campbell >
wrote:
> On 2008-01-14 11:58:30 -0800, Jim Stewart > said:
>
>
>
> > Bertie the Bunyip wrote:
> >> Mxsmanic > wrote in
> :
>
> >>> Alan writes:
>
> >>>> Several times for the past few years, while on a transatlantic flight
> >>>> aboard a KLM 747-400, I begin to hear what sounds like a turbine
> >>>> spinning up, almost like an engine start, but higher pitch...
> >>>> Anyone know what it might be?
> >>> At what point in the flight? And in which seat?
>
> >> Why, you going to book next to him and whine the whole way?
>
> > What's the difference between a jet engine
> > and Anthony?
>
> A jet engine actually produces useful energy?
> --
> Waddling Eagle
> World Famous Flight Instructor

In the former case, the wake produced eventually dissipates?

[Bertie the Bunyip[_19_]]

Jon > wrote in
:

> On Jan 14, 9:02 pm, C J Campbell >
> wrote:
>> On 2008-01-14 11:58:30 -0800, Jim Stewart >
>> said:
>>
>>
>>
>> > Bertie the Bunyip wrote:
>> >> Mxsmanic > wrote in
>> :
>>
>> >>> Alan writes:
>>
>> >>>> Several times for the past few years, while on a transatlantic
>> >>>> flight aboard a KLM 747-400, I begin to hear what sounds like a
>> >>>> turbine spinning up, almost like an engine start, but higher
>> >>>> pitch... Anyone know what it might be?
>> >>> At what point in the flight? And in which seat?
>>
>> >> Why, you going to book next to him and whine the whole way?
>>
>> > What's the difference between a jet engine
>> > and Anthony?
>>
>> A jet engine actually produces useful energy?
>> --
>> Waddling Eagle
>> World Famous Flight Instructor
>
> In the former case, the wake produced eventually dissipates?



Small point, It;s called blast. the stuff off the wing is wake.


Bertie

[Jon]

On Jan 15, 10:01 am, Bertie the Bunyip > wrote:
> Jon > wrote :
>
>
>
> > On Jan 14, 9:02 pm, C J Campbell >
> > wrote:
> >> On 2008-01-14 11:58:30 -0800, Jim Stewart >
> >> said:
>
> >> > Bertie the Bunyip wrote:
> >> >> Mxsmanic > wrote in
> >> :
>
> >> >>> Alan writes:
>
> >> >>>> Several times for the past few years, while on a transatlantic
> >> >>>> flight aboard a KLM 747-400, I begin to hear what sounds like a
> >> >>>> turbine spinning up, almost like an engine start, but higher
> >> >>>> pitch... Anyone know what it might be?
> >> >>> At what point in the flight? And in which seat?
>
> >> >> Why, you going to book next to him and whine the whole way?
>
> >> > What's the difference between a jet engine
> >> > and Anthony?
>
> >> A jet engine actually produces useful energy?
> >> --
> >> Waddling Eagle
> >> World Famous Flight Instructor
>
> > In the former case, the wake produced eventually dissipates?
>
> Small point, It;s called blast. the stuff off the wing is wake.

Yep, my bad.....Jet Blast being the other type of turbulence caused
by... the engine, too ;) Don't wanna be too close to either type I'd
gather, unless you like living dangerously :P



> Bertie

[Bertie the Bunyip[_19_]]

Jon > wrote in
:

> On Jan 15, 10:01 am, Bertie the Bunyip > wrote:
>> Jon > wrote
>> innews:8ba9eedc-68f8-40e0-93ba-

>> om:
>>
>>
>>
>> > On Jan 14, 9:02 pm, C J Campbell >
>> > wrote:
>> >> On 2008-01-14 11:58:30 -0800, Jim Stewart >
>> >> said:
>>
>> >> > Bertie the Bunyip wrote:
>> >> >> Mxsmanic > wrote in
>> >> :
>>
>> >> >>> Alan writes:
>>
>> >> >>>> Several times for the past few years, while on a
>> >> >>>> transatlantic flight aboard a KLM 747-400, I begin to hear
>> >> >>>> what sounds like a turbine spinning up, almost like an engine
>> >> >>>> start, but higher pitch... Anyone know what it might be?
>> >> >>> At what point in the flight? And in which seat?
>>
>> >> >> Why, you going to book next to him and whine the whole way?
>>
>> >> > What's the difference between a jet engine
>> >> > and Anthony?
>>
>> >> A jet engine actually produces useful energy?
>> >> --
>> >> Waddling Eagle
>> >> World Famous Flight Instructor
>>
>> > In the former case, the wake produced eventually dissipates?
>>
>> Small point, It;s called blast. the stuff off the wing is wake.
>
> Yep, my bad.....Jet Blast being the other type of turbulence caused
> by... the engine, too ;) Don't wanna be too close to either type I'd
> gather, unless you like living dangerously :P
>

Datsa right!
in flight jet blast would be the least of your worries of you were that
close. On the ground, jetblast.

Bertie

[Marco Leon[_4_]]

"Alan" > wrote in message
...
> Several times for the past few years, while on a transatlantic flight
> aboard a KLM 747-400, I begin to hear what sounds like a turbine
> spinning up, almost like an engine start, but higher pitch...
> Anyone know what it might be?

The whining sound I usually hear is that of the oven starting up to heat the
meals. (confirmed by an economy class purser for a 747-400).

Marco

[C J Campbell[_1_]]

On 2008-01-15 17:25:13 -0800, Bertie the Bunyip > said:

>
> Datsa right!
> in flight jet blast would be the least of your worries of you were that
> close. On the ground, jetblast.
>
> Bertie

Heh. Henri Coanda sure found that out the hard way. Still, he managed
to live, though he never flew again.
--
Waddling Eagle
World Famous Flight Instructor

[Bertie the Bunyip[_19_]]

C J Campbell > wrote in
news:2008011615123950073-christophercampbell@hotmailcom:

> On 2008-01-15 17:25:13 -0800, Bertie the Bunyip > said:
>
>>
>> Datsa right!
>> in flight jet blast would be the least of your worries of you were that
>> close. On the ground, jetblast.
>>
>> Bertie
>
> Heh. Henri Coanda sure found that out the hard way. Still, he managed
> to live, though he never flew again.

Though he did design! He spent the rest of his days at Bristol, I think.
You have to wonder if he got his ideas lighting farts.

Bertie

[William Hung[_2_]]

On Jan 16, 6:12*pm, C J Campbell >
wrote:
> On 2008-01-15 17:25:13 -0800, Bertie the Bunyip > said:
>
>
>
> > Datsa right!
> > *in flight jet blast would be the least of your worries of you were that
> > close. On the ground, jetblast.
>
> > Bertie
>
> Heh. Henri Coanda sure found that out the hard way. Still, he managed
> to live, though he never flew again.
> --
> Waddling Eagle
> World Famous Flight Instructor

His discover of Coanda Effect led to helicopters with no tail rotors.

http://www.globalsecurity.org/military/systems/aircraft/images/mh-90-notar-work.gif

Wil

[Jon]

On Jan 15, 8:25 pm, Bertie the Bunyip > wrote:
> Jon > wrote :
>
> > On Jan 15, 10:01 am, Bertie the Bunyip > wrote:
> >> Jon > wrote
> >> innews:8ba9eedc-68f8-40e0-93ba-
>
>
>
>
>
> >> om:
>
> >> > On Jan 14, 9:02 pm, C J Campbell >
> >> > wrote:
> >> >> On 2008-01-14 11:58:30 -0800, Jim Stewart >
> >> >> said:
>
> >> >> > Bertie the Bunyip wrote:
> >> >> >> Mxsmanic > wrote in
> >> >> :
>
> >> >> >>> Alan writes:
>
> >> >> >>>> Several times for the past few years, while on a
> >> >> >>>> transatlantic flight aboard a KLM 747-400, I begin to hear
> >> >> >>>> what sounds like a turbine spinning up, almost like an engine
> >> >> >>>> start, but higher pitch... Anyone know what it might be?
> >> >> >>> At what point in the flight? And in which seat?
>
> >> >> >> Why, you going to book next to him and whine the whole way?
>
> >> >> > What's the difference between ajetengine
> >> >> > and Anthony?
>
> >> >> Ajetengine actually produces useful energy?
> >> >> --
> >> >> Waddling Eagle
> >> >> World Famous Flight Instructor
>
> >> > In the former case, the wake produced eventually dissipates?
>
> >> Small point, It;s calledblast. the stuff off the wing is wake.
>
> > Yep, my bad.....JetBlastbeing the other type of turbulence caused
> > by... the engine, too ;) Don't wanna be too close to either type I'd
> > gather, unless you like living dangerously :P
>
> Datsa right!
> in flightjetblastwould be the least of your worries of you were that
> close. On the ground, jetblast.
>
> Bertie

<http://media2.stupidvideos.us/video/extreme/38763.3647549653.wmv>

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video/extreme/38763.3647549653.wmv>