jcooke
Posts: 80
Joined: Sat Aug 16, 2003 10:16 am

Starting Up A A321 - What Was It?

Fri Apr 02, 2004 12:56 pm

Here's one for the techies:

On my recent flight PIT-LAX the ground crew was prepping the plane for takeoff and they pulled over this rather large cart with a hose on it. I looked at it and it had an exhaust pipe on it. They took the hose and hooked it up to the underbody of the plane and then started pumping what I'm guessing air into the plane at full bore for about 10 minutes. about a minute or two before they shut this off they started up the engines and then disconnected the hose. The engine did make what seemed to be a backfire sound when it started up.

Was this some type of "bleed air" or whatever you may call it to get the engine started? If not, what was it and what does it do?

Thanks!

-JC
 
videns
Posts: 132
Joined: Thu Mar 18, 2004 3:28 pm

RE: Starting Up A A321 - What Was It?

Fri Apr 02, 2004 2:13 pm


Yes. They use it when the APU is not working.
Travel? Why would i travel if I can watch it on TV?
 
dairbus
Posts: 518
Joined: Mon Nov 17, 2003 10:45 am

RE: Starting Up A A321 - What Was It?

Sat Apr 03, 2004 11:10 am

The correct term for the piece of equipment is an air start cart commonly referred as a huffer. There are three types that can be used. The first is a start bottle which is basically a large tank of compressed air. This is usually used only at smaller airports and for smaller planes say up to a 737 in size.

The second one is a jet starter which is less common nowadays. This is a small jet engine which supplies bleed air through a hose for engine start. It is basically an APU with wheels. It is less common because it has a relatively limited output and it makes an incredible amount of noise.

The third type is probably the one you saw being used which consists of a large diesel engine driven compressor providing a source of high pressure air for engine start. These have the advantage of being quieter than the jet starter and can provide more volume and pressure than the air bottle. This is the most common type used today although there are a couple of the older types still around. As the previous post stated, an external source of air must be used for engine start when the APU is inop.

"I love mankind. It's people I can't stand." - Charles Shultz
 
jcooke
Posts: 80
Joined: Sat Aug 16, 2003 10:16 am

RE: Starting Up A A321 - What Was It?

Sat Apr 03, 2004 12:14 pm

Thanks for the info. It definitely was one of the diesel-powered starters.

The jet starters are louder than the diesels? WOW! This thing was pretty dang loud so I couldn't imagine the jet one.

-JC

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