The Airbus procedue for single engine taxi is to turn the APU bleed off and put the X-bleed selector to -open.

I know at USAirways and Jet Blue, they leave the APU bleed on and X-bleed in -auto instead. I'm looking for information on what is SOP at, UA, Northwest/Delta and Spirit.

I would really appreciate any information you folks have on the procedure.



Thanks

We use the APU with X-bleed in AUTO. We only use x-bleed starts if the APU is inop. Normal SE taxi out is with #1 Bleed ON, X-Bleed OPEN, and APU Bleed OFF. This allows the #1 engine bleed to supply both packs, and (the book says) this keeps the engine exaust from contaminating the air conditioning via the APU intake/bleed, which is why we don't turn the APU bleed on until right before the 2nd start.



From our Manual:

DELAYED START PROCEDURE:

ENG MODE selector: IGN/START

Cross Bleed Selector: Rotate Auto

APU Bleed pb: ON

Engine #2 Bleed pb: Verify ON

Y ELEC PUMP pb: OFF

Engine Start Procedure: Accomplish


After engine start:

ENG MODE selector: NORM

APU BLEED pb: OFF

ENG ANTI ICE: as reqd

APU MASTER SW pb: OFF (may remain ON for MDM considerations)

Flight Controls: ckd

DELAYED START checklist


Hope this helps.

Thanks for the info. Your procedure looks like it's straight from Airbus. The only problem is that it runs the N1 of the operating engine to 24% vs 19% and ups the fuel flow by 200 PPH at idle.

I'm trying to develop some data and see if my company is interested in changing procedure. Again, thanks for your input.


Cheers

At Frontier it's APU bleed on, crossbleed to Auto. Running both packs on one engine with the APU at idle burns more gas than running both packs on the APU. If you want real fuel savings, do APU off, and crossbleed AUTO until you do the crossbleed engine start. One pack will keep up with the AC requirements just fine under any circumstances I've seen.

Spirit's is X-BLEED AUTO, APU BLEED OFF, Y HYD PUMP on until we start #2. That is...until 12:01am Saturday. After that, we don't start any engines until we get a contract. That should save a lot of fuel!

LOL. I hope you guys get justice and equity in the process. Something not commonplace in big corporations.

yyyyyaaaaawn...