coolpilot
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737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 4:48 am

I noticed on my last trip on a 737-700, as we turned to pull into the gate at KBWI the right side engine was shut down completely and the left one was left on until we were parked and the seat belt light was turned off. Is this normal?
 
Ralgha
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 5:14 am

Yes.
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aogdesk
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 5:17 am

No need to taxi on two engines, might as well shut one down on taxi-in. Gets the shutdown checklist started sooner.
 
VC-10
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 5:25 am

Quoting Aogdesk (Reply 2):
No need to taxi on two engines, might as well shut one down on taxi-in. Gets the shutdown checklist started sooner.

It is more a case of fuel conservation
 
jamesbuk
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 5:55 am

Quoting Aogdesk (Reply 2):
down on taxi-in.

He said when they turned into the gate area, so when they turn and start lining up to jetway and this would be so that the trucks that load and unload the plane from the right side can get roughly into postion while the crew go through the engine shut down check.

rgds --James--
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N231YE
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 5:57 am

Quoting VC-10 (Reply 3):
It is more a case of fuel conservation

Especially in today's airline business...it is more economical to taxi on one engine to save fuel.
 
OPNLguy
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 6:31 am

Quoting Coolpilot (Thread starter):
Is this normal?

Yes, and it's for fuel conservation and to allow the #2 engine to spin down earlier so that when the aircraft blocks in the ramp folks can get right to work.

Quoting Aogdesk (Reply 2):
Gets the shutdown checklist started sooner.

I don't have a checklist in front of me, but wouldn't this occur only after both engines had been shut down?
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
AirframeAS
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 6:52 am

Not only its for conservation of fuel, its for safety purpose, the cargo pit doors are on the right side of the fuselage. Its so that the rampers dont get sucked in, even though there is still pressure coming into the engine inlet. Thats based upon the SOP at AS.
A Safe Flight Begins With Quality Maintenance On The Ground.
 
coolpilot
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 7:44 am

Ah, that would make sense safety wise since the SWA groundcrews move in as soon as the plane is in position. I guess they wait until the final turn because I would imagine that it would be difficult to steer with only one engine. I know 747s do it all the time with 4 engines, but is it hard to control a 2-engine aircraft with only 1 engine?
 
XFSUgimpLB41X
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 8:29 am

It's not difficult to steer with only one engine. I taxi out and in single engine the majority of the time in the CRJ. A hard right turn-out from a hardstand is the only really hard thing to do while respecting ground thrust limitations if you're single engine.
Chicks dig winglets.
 
barney captain
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 8:37 am

Quoting OPNLguy (Reply 6):
I don't have a checklist in front of me, but wouldn't this occur only after both engines had been shut down?

Correctamundo.

The procedure goes something like this:

As long as the braking action is at least good -#2 engine cut-off.

Once stopped, set parking brake, seat belt sign off.

Chocks are put in place, ground power connected, #1 engine cutoff.

Brakes released, parking checklist read/completed.

Burrito/Starbucks run commenced.
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IAHFLYR
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 8:39 am

Alot of airlines will shut #2 down after crossing an active runway to save the precious $$$ of burning fuel needlessly!
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nonfirm
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 8:54 am

It helps preserve the life of the rampers and save the company money on fuel.  airplane 
 
aogdesk
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 1:54 pm

Quoting Aogdesk (Reply 2):
Gets the shutdown checklist started sooner

Damn, forgot my little tongue in cheek smiley. For those thinking i was serious about the checklist, I wasn't. Fuel fuel fuel.
 
ThirtyEcho
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 2:12 pm

Such an operation was very common on piston propliners. It not only saves fuel but it saves on engine time, as well.

Suppose that you shut down the #1 and #4 and it takes 10 minutes to taxi in on the remaining two engines. In a six-stop day, that saves two hours of engine operation.
 
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HAWK21M
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RE: 737 Shutting Down Engine Before Stopping

Tue Nov 28, 2006 10:29 pm

It can save some Expensive ATF & also helps having the RH side Engine shutdown faster so Service crews can commence work faster.
Out here there have been occasions when the Inbd Engine to a turn Ahead has been shutdown a minute or two prior to Taxiing into the Bay.

regds
MEL
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highflyer9790
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RE: 737 Shutting Down Engine Before Stopping

Wed Dec 06, 2006 12:02 pm

Same thing happens sometimes to my knowledge while taxiing to the active for takeoff-if its rush hour and you are #15 for takeoff, its much better to only burn the fuel needed for one engine.
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Tristarsteve
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RE: 737 Shutting Down Engine Before Stopping

Wed Dec 06, 2006 5:06 pm

Quoting Barney Captain (Reply 10):
Chocks are put in place, ground power connected, #1 engine cutoff

But make sure that the ground handling rules dont say that the rampers must not approach an aircraft with the beacon on!
 
barney captain
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RE: 737 Shutting Down Engine Before Stopping

Wed Dec 06, 2006 7:16 pm

Quoting TristarSteve (Reply 17):
Quoting Barney Captain (Reply 10):
Chocks are put in place, ground power connected, #1 engine cutoff

But make sure that the ground handling rules dont say that the rampers must not approach an aircraft with the beacon on!

I'm not 100% sure what you're referring to, but our procedure allows for the ground crews to approach the a/c while the #1 engine is running (or both for that matter) for the purposes of hooking up the ground power.
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IAHFLYR
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RE: 737 Shutting Down Engine Before Stopping

Wed Dec 06, 2006 9:39 pm

Quoting HighFlyer9790 (Reply 16):
Same thing happens sometimes to my knowledge while taxiing to the active for takeoff-if its rush hour and you are #15 for takeoff, its much better to only burn the fuel needed for one engine.

And hope you don't get the call to wander past all others as you're number next, position and hold! Whoops.......now what, minute to start, 2 to heat!  embarrassed 
Any views shared are strictly my own and do not a represent those of any former employer.
 
twal1011727
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RE: 737 Shutting Down Engine Before Stopping

Mon Dec 18, 2006 3:40 am

To take this further...some airlines leave the APU off til external power is hooked up...saves on APU cycles too.

With the majority of airlines they have a 1 minute cool down before they are allowed to shutoff an engine.
Generally stated (in TWA flt manual)any ops below 80% N2 is included in the cool time.
Most will delay shutdown til they cross multi runways and get on the ramp.

KD
 
L-188
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RE: 737 Shutting Down Engine Before Stopping

Mon Dec 18, 2006 4:35 am

Quoting Coolpilot (Thread starter):
Is this normal?

It is for noise abatemnet.

A ramp rat going through the compressor section makes one hell of a racket.
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Tristarsteve
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RE: 737 Shutting Down Engine Before Stopping

Mon Dec 18, 2006 4:42 am

Quoting Barney Captain (Reply 18):
but our procedure allows for the ground crews to approach the a/c while the #1 engine is running (or both for that matter) for the purposes of hooking up the ground power.

But I hope they must wait until the aircraft is stopped first. There have been two rampers run over by aircraft this autumn!
How does the ramp worker know that the aircraft has stopped before he approaches it to hook up ground power? What all aircraft need is a parking brake light on the noseleg facing fwd (like B757/767/777 A320) so everyone can see that the brakes are on before approaching the aircraft. There are too many incidents on the ramp with parking aircraft with engines running. Everyone is in a hurry to start work. We recently had a ramp worker walk out to Nbr1 engine on an A319 to place the cone in front of it. The cone was sucked up into the running engine!
I personally believe in no one approaching the aircraft until the engines are off and the beacons are off. But how do you cope with the case where the APU does not start on arrival?
 
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HAWK21M
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RE: 737 Shutting Down Engine Before Stopping

Mon Dec 18, 2006 1:02 pm

Quoting TWAL1011727 (Reply 20):
Most will delay shutdown til they cross multi runways and get on the ramp.

Still that would take min Two minutes which is Adequate cooling time at Idle.

Quoting TristarSteve (Reply 22):
We recently had a ramp worker walk out to Nbr1 engine on an A319 to place the cone in front of it. The cone was sucked up into the running engine

Is there any training provided.I'm surprised.

Quoting TristarSteve (Reply 22):
I personally believe in no one approaching the aircraft until the engines are off and the beacons are off. But how do you cope with the case where the APU does not start on arrival?

Out here chocks are placed only after Parking brakes are set & Engines are shutdown.If tha APU is u/s in day ops is not a problem.Its only during nights when the GPU would need to be connected prior to Engine shutdown,but thats a rarity.
On Freighters even thats not an issue.If its dark for a few minutes its ok.Safety comes first.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
N243NW
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RE: 737 Shutting Down Engine Before Stopping

Mon Dec 18, 2006 1:47 pm

Quoting TristarSteve (Reply 22):
We recently had a ramp worker walk out to Nbr1 engine on an A319 to place the cone in front of it. The cone was sucked up into the running engine!

From the looks of it, the ramp worker was fortunate not to get sucked in himself!

-N243NW Big grin
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