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Detailed Description Of How BAe146 Air Stair Works  
User currently offlineFlyboy80 From United States of America, joined Jul 2001, 1875 posts, RR: 3
Posted (10 years 5 months 5 days 10 hours ago) and read 3582 times:

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!


10 replies: All unread, jump to last
 
User currently offlineMusang From United Kingdom, joined Apr 2001, 852 posts, RR: 7
Reply 1, posted (10 years 5 months 5 days 4 hours ago) and read 3503 times:

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


User currently offlineFlyboy80 From United States of America, joined Jul 2001, 1875 posts, RR: 3
Reply 2, posted (10 years 5 months 1 day 17 hours ago) and read 3395 times:

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?

User currently offlineMusang From United Kingdom, joined Apr 2001, 852 posts, RR: 7
Reply 3, posted (10 years 5 months 2 hours ago) and read 3322 times:

Yes.

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

Regards - Musang


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 4, posted (10 years 4 months 4 weeks 1 day 16 hours ago) and read 3288 times:

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"
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 5, posted (10 years 4 months 4 weeks 1 day 16 hours ago) and read 3287 times:

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"
User currently offlineFlyboy80 From United States of America, joined Jul 2001, 1875 posts, RR: 3
Reply 6, posted (10 years 4 months 4 weeks 1 day 13 hours ago) and read 3276 times:

Did avro design their airstairs like that of the 737s, differing from the formet design of incabin stowage of BAe146?

User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 7, posted (10 years 4 months 4 weeks 1 day 7 hours ago) and read 3265 times:

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.
User currently offlineMusang From United Kingdom, joined Apr 2001, 852 posts, RR: 7
Reply 8, posted (10 years 4 months 4 weeks 1 day 5 hours ago) and read 3266 times:

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


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 9, posted (10 years 4 months 4 weeks 19 hours ago) and read 3234 times:

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"
User currently offlineFlyboy80 From United States of America, joined Jul 2001, 1875 posts, RR: 3
Reply 10, posted (10 years 4 months 4 weeks 19 hours ago) and read 3232 times:

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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