cosmiccomet

In my previous company, i was flying DC10-30F and the normal pack configuration was Two packs ON and the other OFF.
In the '10 you can close the Pack Ram Door, so you can save even more fuel.
We usually flew with only one pack ON and the other two OFF without any problem up to F410. Flying with 73 horses at F350 is also not a problem with only one pack.

I am actually flying B744F and we are always flying with three packs ON.
I couldn't find any procedure about flying with two packs ON / one OFF.
The MEL requires two packs for dispatch.

I would like to know if the three packs ON configuration is standard in all B744 operators and if it is the same in the B742/3.

Thanks.

mtogw

Wow 73 horses and only one pack on,, if we had one pack inop we couldn't even load livestock on the 10...
always flew with two packs on with livestock..

cosmiccomet

I ve flown 4 years with horses all around the world and believe me, no problems with one pack if you don't have leaks in the pneumatics or sealings broken.
We also flew with roses and only one pack in cruise is enough for keeping the temperature below 10`C.

But anyway, the question is about the 742 and 744

Intruder

The 742F comes in both 2- and 3-pack configurations. Our SOP is to run only 2 packs in cruise unless livestock is on board a 3-pack airplane.

The 744F packs are different, and normally run at a low-output setting in cruise. All 744Fs have 3 packs, AFAIK. They can manually be set to high output, and will automatically do so in certain settings of lower compartment temperature control or if 1 pack fails.

Our SOP is that all packs must be operational to take off with livestock, regardless of airplane configuration.

SNS3Guppy

We have 2 and 3 pack -200's. We generally run one pack enroute.

742

As I recall turning one pack off on a -400F will put the other two into high flow, so there is no fuel savings.

psi-fly

Correct, when you take off the packs are in hi-flow. When a/c changes to a crz mode the packs come out of hi-flow and the output reduces by 1/3, same as turning 1 off on a 3 pack a/c.

cosmiccomet

As I was supposing the three packs ON in the 744 is the normal configuration for to, cruice and landing.
According with the Boing's FCOM, each pack operating in Hi Flow will increase the FF in 0,3%.

Thanks for your answears.

Happy Landings.

Intruder

Check your EICAS pages... Our 744 packs output about twice the flow rate in high flow (or reduce by 1/2 when transitioning from high to normal flow).

point8six

cosmiccomet

With horses, two or three packs are the same in terms of smell.
After 8 or 9 hours flight, everything stinks like a horse including the pilots and the FE.