da2d7b72
XPost: rec.aviation.piloting, alt.aviation.kooks
From: AA@AA.AA
D Ramapriya wrote in
news:d6cd3158-6cb0-4ffd-927c-59ca49abda9f@m34g2000hsf.googlegroups.com:
> On Jan 30, 3:48 pm, Bertie the Bunyip wrote:
>> D Ramapriya wrote
>> innews:2690baef-0857-4600-a0c5-4
> 26a1d134099@n20g2000hsh.googlegroups.com:
>>
>> > On Jan 30, 2:33 pm, Bertie the Bunyip wrote:
>> >> D Ramapriya wrote
>> >> innews:24252c28-895a-44da-bd25-
>>
>> 662f25fa3...@v4g2000hsf.googlegroups.co
>>
>>
>>
>>
>>
>> >> m:
>>
>> >> > On Jan 30, 2:08 pm, Bertie the Bunyip wrote:
>> >> >> D Ramapriya wrote in
>> >> >> news:2ff47125-cffd-4909-b028-
>> >> >> 93288fe9a...@s12g2000prg.googlegroups.com:
>>
>> >> >> > On Jan 30, 8:41 am, WingFlaps wrote:
>> >> >> >> On Jan 30, 2:03 pm, girish....@gmail.com 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.
>
>
> So the AP's FD Altitude Controls do what?
The FD and the autopilot are two different things.
Bertie
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