Max Service ceiling for commercial airplanes

D Ramapriya wrote in news:2ff47125-cffd-4909-b028-
:

On Jan 30, 8:41 am, WingFlaps wrote:
On Jan 30, 2:03 pm, wrote:

Out of curiosity I was wondering which civilian passenger airplanes
have the highest service ceilings? Wikipedia indicates that some
business jets have ceilings greater than 53000 ft or so while the 747
has only 43000 ft. Also why do large aircraft fly much lower than
their service ceilings? Usually I never see a large jet go beyond
37000 or so even on very long haul flights. I assume they would be
even more efficient if they flew close to service ceilings on long
haul flights.

Could be due to weight? When you fly across the Pacific the plane can
only get higher as fuel is burned.


Get higher? I thought that's what the continual small adjustments
effected by the trim wheels do to preclude, especially with the
AutoPilot engaged?


Huh?


Bertie

On Jan 30, 2:08 pm, Bertie the Bunyip wrote:
D Ramapriya wrote in news:2ff47125-cffd-4909-b028-
:



On Jan 30, 8:41 am, WingFlaps wrote:
On Jan 30, 2:03 pm, wrote:

Out of curiosity I was wondering which civilian passenger airplanes
have the highest service ceilings? Wikipedia indicates that some
business jets have ceilings greater than 53000 ft or so while the 747
has only 43000 ft. Also why do large aircraft fly much lower than
their service ceilings? Usually I never see a large jet go beyond
37000 or so even on very long haul flights. I assume they would be
even more efficient if they flew close to service ceilings on long
haul flights.

Could be due to weight? When you fly across the Pacific the plane can
only get higher as fuel is burned.

Get higher? I thought that's what the continual small adjustments
effected by the trim wheels do to preclude, especially with the
AutoPilot engaged?

Huh?

Bertie

I meant to say that the AP will ensure that you keep flying at the
programmed altitude (through trim and throttle changes) instead of
letting the plane go higher with diminishing weight. Have I missed
something?

Ramapriya

D Ramapriya wrote in
:

On Jan 30, 2:08 pm, Bertie the Bunyip wrote:
D Ramapriya wrote in
news:2ff47125-cffd-4909-b028-
:



On Jan 30, 8:41 am, WingFlaps wrote:
On Jan 30, 2:03 pm, wrote:

Out of curiosity I was wondering which civilian passenger
airplanes have the highest service ceilings? Wikipedia indicates
that some business jets have ceilings greater than 53000 ft or
so while the 747 has only 43000 ft. Also why do large aircraft
fly much lower than their service ceilings? Usually I never see
a large jet go beyond 37000 or so even on very long haul
flights. I assume they would be even more efficient if they flew
close to service ceilings on long haul flights.

Could be due to weight? When you fly across the Pacific the plane
can only get higher as fuel is burned.

Get higher? I thought that's what the continual small adjustments
effected by the trim wheels do to preclude, especially with the
AutoPilot engaged?

Huh?

Bertie

I meant to say that the AP will ensure that you keep flying at the
programmed altitude (through trim and throttle changes) instead of
letting the plane go higher with diminishing weight. Have I missed
something?


We get cleared to an altitude and have to hold that altitude to avoid
running into other airplanes. The autopilot does not just go where it
pleases. Not yet, anyway.


Bertie

On Jan 30, 2:33 pm, Bertie the Bunyip wrote:
D Ramapriya wrote :



On Jan 30, 2:08 pm, Bertie the Bunyip wrote:
D Ramapriya wrote in
news:2ff47125-cffd-4909-b028-
:

On Jan 30, 8:41 am, WingFlaps wrote:
On Jan 30, 2:03 pm, wrote:

Out of curiosity I was wondering which civilian passenger
airplanes have the highest service ceilings? Wikipedia indicates
that some business jets have ceilings greater than 53000 ft or
so while the 747 has only 43000 ft. Also why do large aircraft
fly much lower than their service ceilings? Usually I never see
a large jet go beyond 37000 or so even on very long haul
flights. I assume they would be even more efficient if they flew
close to service ceilings on long haul flights.

Could be due to weight? When you fly across the Pacific the plane
can only get higher as fuel is burned.

Get higher? I thought that's what the continual small adjustments
effected by the trim wheels do to preclude, especially with the
AutoPilot engaged?

Huh?

Bertie

I meant to say that the AP will ensure that you keep flying at the
programmed altitude (through trim and throttle changes) instead of
letting the plane go higher with diminishing weight. Have I missed
something?

We get cleared to an altitude and have to hold that altitude to avoid
running into other airplanes. The autopilot does not just go where it
pleases.


My point exactly, in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.

Ramapriya

On Wed, 30 Jan 2008 02:44:29 -0800 (PST), D Ramapriya
wrote:


My point exactly, in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.

Ramapriya

Google "step climb".

Clark wrote in news:Xns9A354D69FC171ch2uswestnet@
64.209.0.90:

Peter Clark wrote in
:

On Wed, 30 Jan 2008 02:44:29 -0800 (PST), D Ramapriya
wrote:


My point exactly, in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.

Ramapriya

Google "step climb".

better yet, google cruise climb


Different thing altogether.


It;'s a speed selected to optimise the climb in order to get a speed that
will give you a better performance, whether that be time point to point, or
fuel economy. IOW you sacrifice a tiny bit of your ROC in order to get a
disproportianate increase in speed. Works in anything to some extent or
another.

Bertie

On Wed, 30 Jan 2008 02:44:29 -0800 (PST), D Ramapriya
wrote:

My point exactly, in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.

Oh - Hey Bertie, any TCAS system ever hooked up to feed autoflight? I
can't think of any.

Peter Clark wrote in
news
On Wed, 30 Jan 2008 02:44:29 -0800 (PST), D Ramapriya
wrote:

My point exactly, in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.

Oh - Hey Bertie, any TCAS system ever hooked up to feed autoflight? I
can't think of any.


Jesus. you wouldn't want that at the moment. there will probably come a
time, but this guy is just spouting **** he;s read in Flight International
with no understanding of what's going on.


Bertie

On Wed, 30 Jan 2008 12:19:58 +0000 (UTC), Bertie the Bunyip
wrote:

Peter Clark wrote in
news
On Wed, 30 Jan 2008 02:44:29 -0800 (PST), D Ramapriya
wrote:

My point exactly, in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.

Oh - Hey Bertie, any TCAS system ever hooked up to feed autoflight? I
can't think of any.


Jesus. you wouldn't want that at the moment. there will probably come a
time, but this guy is just spouting **** he;s read in Flight International
with no understanding of what's going on.

Yea, I figured that. I didn't know if there was something special in
the 380, but I couldn't think of any product where TCAS would jump in
and override the MCP.....

D Ramapriya wrote in
:

On Jan 30, 2:33 pm, Bertie the Bunyip wrote:
D Ramapriya wrote
innews:24252c28-895a-44da-bd25-

m:



On Jan 30, 2:08 pm, Bertie the Bunyip wrote:
D Ramapriya wrote in
news:2ff47125-cffd-4909-b028-
:

On Jan 30, 8:41 am, WingFlaps wrote:
On Jan 30, 2:03 pm, wrote:

Out of curiosity I was wondering which civilian passenger
airplanes have the highest service ceilings? Wikipedia
indicates that some business jets have ceilings greater than
53000 ft or so while the 747 has only 43000 ft. Also why do
large aircraft fly much lower than their service ceilings?
Usually I never see a large jet go beyond 37000 or so even on
very long haul flights. I assume they would be even more
efficient if they flew close to service ceilings on long haul
flights.

Could be due to weight? When you fly across the Pacific the
plane can only get higher as fuel is burned.

Get higher? I thought that's what the continual small
adjustments effected by the trim wheels do to preclude,
especially with the AutoPilot engaged?

Huh?

Bertie

I meant to say that the AP will ensure that you keep flying at the
programmed altitude (through trim and throttle changes) instead of
letting the plane go higher with diminishing weight. Have I missed
something?

We get cleared to an altitude and have to hold that altitude to avoid
running into other airplanes. The autopilot does not just go where it
pleases.


My point exactly,

No, it wasn't. you said that the AP will ensure that you keep flying at
the programmed altitude throught trim and throttle changes.
It won't.


in response to WingFlaps' "When you fly across the
Pacific the plane can only get higher as fuel is burned".

The AP will anon go where it pleases too on the next-generation
'Buses, albeit in exceptional circumstances. From what I've read, if
there's a TCAS warning, the decision will be taken out of the pilots'
hands and the AP will command as needed to avoid a collision.



You're talking straight out of your ass.


Bertie