747 engine takeoff power

I've never heard of this. Any a/c that I'm familiar with
certainly don't modulate takeoff power according to their weight.


Bob's explination is 100% correct we use reduced Takoff power to save wear and
tare on the engine these engines are running in excess of 10,000 hours before
removal.
I fly a 727 at fedex, We generally fly at weights above the passenger carriers.

The option of max thrust is always availabel but in my case in the 727 the
plane flies fine with engine out at reduced power. Max power is always avilable
then in extremis there is red line power as well as firewall power.
The weird thing is we use a Laptop that is programed with the modex as well as
all the airports and runways we are authorised to operate out of so it is
really easy to compute T/O performance as well as trim setting.The two things
we arn't provided is the takoff distance or a line speed check #.
I asked in training and they really don't seem to think those are things we
need to know. The reason more 727's arn't crashed is because the plane flies
better than the sim.
Sparky

(Elmshoot) wrote:


I've never heard of this. Any a/c that I'm familiar with
certainly don't modulate takeoff power according to their weight.


Bob's explination is 100% correct we use reduced Takoff power to save wear and
tare on the engine these engines are running in excess of 10,000 hours before
removal.
I fly a 727 at fedex, We generally fly at weights above the passenger carriers.

The option of max thrust is always availabel but in my case in the 727 the
plane flies fine with engine out at reduced power. Max power is always avilable
then in extremis there is red line power as well as firewall power.
The weird thing is we use a Laptop that is programed with the modex as well as
all the airports and runways we are authorised to operate out of so it is
really easy to compute T/O performance as well as trim setting.The two things
we arn't provided is the takoff distance or a line speed check #.
I asked in training and they really don't seem to think those are things we
need to know. The reason more 727's arn't crashed is because the plane flies
better than the sim.
Sparky

Thanks Sparky, I appreciate the education...
--

-Gord.
(use gordon in email)

Gord,
Concerning the weight shift and CG movemnt to get better cruise economy. The
MD-11 has that capability and is used operationaly at Fedex. There have been
some problems with the system. The MD is the most unsafe modern transport
catagory aircraft in history.
We had one make a hard landing and we learned after the crash that the wing is
designed to fail before the landing gear does resulting in the wing coming off
and the plane coming to rest upside down.
There have been some problems with the fly by wire lag in the flight controls
that resulted in PIO during the landing. I don't know anything more about the
specifics on these problms but I guess I will learn when I transition to the
Mad Dog in a few years.
Sparky

"Elmshoot" wrotecom...
Concerning the weight shift and CG movemnt to get better cruise economy. The
MD-11 has that capability and is used operationaly at Fedex. There have been
some problems with the system. The MD is the most unsafe modern transport
catagory aircraft in history.
We had one make a hard landing and we learned after the crash that the wing
is
designed to fail before the landing gear does resulting in the wing coming off
and the plane coming to rest upside down.
There have been some problems with the fly by wire lag in the flight controls
that resulted in PIO during the landing. I don't know anything more about the
specifics on these problms but I guess I will learn when I transition to the
Mad Dog in a few years.

[Keeping a semblance of "military" in the thread...]

So, you're gonna bid the MD-[9]11 so you can git kilt in a civil airplane after
all those years in [E]A-6s?!? Can I have your flight jacket?

(Elmshoot) wrote in message ...
Gord,
Concerning the weight shift and CG movemnt to get better cruise economy.
SNIP:

FWIW the L1011 was operated that way - retaining fuel in the #2 outer
tanks moved the CG back in cruise flight to reduce horizontal tail
trim drag. This fuel was used later in flight, of course.
Walt BJ