flyboy80
Posts: 1812
Joined: Fri Jul 13, 2001 8:10 am

Detailed Description Of How BAe146 Air Stair Works

Sat Nov 22, 2003 3:47 pm

Hi, Could someone give me a detailed description of how the BAe146/ Avro RJ air stair is operated... I've always been interested in how EXACTLY it works. I am also interested in that of the SAAB 340 which I believe operates simularly. Thank you for any information!
 
musang
Posts: 788
Joined: Sun Apr 08, 2001 4:11 am

RE: Detailed Description Of How BAe146 Air Stair Works

Sat Nov 22, 2003 9:40 pm

Good Day.

I assume you've watched one working, so my description will make sense. If I was more computer literate I'd attach illustrations from the manuals. I drove RJ 100s but I believe the system is identical to the 146.

Starting from the down position. The switch is on the cabin attendant's panel near the forward jumpseat. Hydraulic pressure (early RJ 100s required the cabin crew to shout "Power for the stairs please", upon which we switched on the AC hydraulic pump. Later aircraft had an Airstair Accumulator, similar to a brake accumulator, so there was enough stored pressure to raise the steps a couple of times) from the yellow system goes to an actuator visible at the top of the stair, which lifts it clear of the ground. As it rises it folds in half so that on reaching the vertical position it is completely folded. It continues slightly over-centre into the door aperture and the cabin attendant's switch is then released.

The whole assembly is mounted on a cradle which slides aft on two recessed rails in the floor, into a recess just aft of the door, and is then safety-strapped in.

To extend the stairs, they are unstrapped, slid forward and pushed over-centre out of the doorway. The switch insn't used, as they self lower to the ground. If there was a Yellow hydraulic system problem they might not be damped, so would have to be lowered by staff standing outside. But we never did this in 5 years, being a bit dangerous.

Rear airstairs were an optional extra, the only ones I ever saw were those of Buzz. I believe they retract then slide forward into their stowage, as there's a toilet behind the door.

Regards - Musang
 
flyboy80
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Joined: Fri Jul 13, 2001 8:10 am

RE: Detailed Description Of How BAe146 Air Stair Works

Wed Nov 26, 2003 8:54 am

For instance, If i was to walk up front into the galley of the aircraft during a flight, would I beable to see the "track" that the Air Stair slides out on?
 
musang
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Joined: Sun Apr 08, 2001 4:11 am

RE: Detailed Description Of How BAe146 Air Stair Works

Thu Nov 27, 2003 11:59 pm

Yes.

Why? What are you planning to do??!!

Regards - Musang
 
EMBQA
Posts: 7795
Joined: Sat Oct 25, 2003 3:52 am

RE: Detailed Description Of How BAe146 Air Stair Works

Fri Nov 28, 2003 9:47 am

As far as the Saab 340.......Open Main Pax door, Unlock airstairs from their stowed position next to the FA seat with your toe, pull the stair assy aft til it locks in place in the track, unlatch the lower step assy, and push open....the steps unfold ...gravity takes care of the rest.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
EMBQA
Posts: 7795
Joined: Sat Oct 25, 2003 3:52 am

RE: Detailed Description Of How BAe146 Air Stair Works

Fri Nov 28, 2003 9:55 am

Musang-

You know....we flew RJ-70's for a while, and can just about remember the airstairs working the same as the 737's. They where 'stowed' under the cabin floor and popped out of a door when the "Deploy" button was pushed.

I may be wrong..... it was 6 years ago, and I only worked on them for a short time.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
flyboy80
Posts: 1812
Joined: Fri Jul 13, 2001 8:10 am

RE: Detailed Description Of How BAe146 Air Stair Works

Fri Nov 28, 2003 1:35 pm

Did avro design their airstairs like that of the 737s, differing from the formet design of incabin stowage of BAe146?
 
FredT
Posts: 2166
Joined: Thu Feb 07, 2002 9:51 pm

RE: Detailed Description Of How BAe146 Air Stair Works

Fri Nov 28, 2003 7:39 pm

How about specifying why you want to know? That would make it easier for the people here to provide the information you want.

Furthermore, you'll have to understand that when people start asking questions about what they'd see if they walked into the galley in flight, aviation professionals in this post 9/11 age start wondering. Paranoia for sure, but perhaps not a completely bad thing.

It was always polite and wise to specify the reason for enquiry, and today it makes more sense than ever to do so.

Cheers,
Fred
I thought I was doing good trying to avoid those airport hotels... and look at me now.
 
musang
Posts: 788
Joined: Sun Apr 08, 2001 4:11 am

RE: Detailed Description Of How BAe146 Air Stair Works

Fri Nov 28, 2003 8:57 pm

EMBQA - I fear you are mistaken. A 737/BAC-111 type airstair installation on the 146/RJ series would take up most of the avionics bay, which extends aft under the galley floor. There's only been one type of stair unit.

I can now confirm that if fitted, the rear airstair installation slides forward into its stowage.

Regards - Musang
 
EMBQA
Posts: 7795
Joined: Sat Oct 25, 2003 3:52 am

RE: Detailed Description Of How BAe146 Air Stair Works

Sat Nov 29, 2003 7:24 am

Musang..

Thanks.. Like I said, its been 8 years since I have even touched one, and even then they where on the way out when I was hired.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
flyboy80
Posts: 1812
Joined: Fri Jul 13, 2001 8:10 am

RE: Detailed Description Of How BAe146 Air Stair Works

Sat Nov 29, 2003 7:30 am

Im Simply just interested in the way it operates... And BTW if a terrorist or someone wanted that info... they wouldn't need it, because there's an arrow on the door telling the direction of handle travel and its obviously not to complicated... Im just interested in the way the mechanism operates.

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