jgore
Posts: 518
Joined: Sun Feb 17, 2002 2:41 am

Side Stick Priority. What Is It For?

Fri Feb 14, 2003 3:09 am

Please take a look at the right edge of the autopilot.


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Photo © Jottier



What is this indicator/button called "Side Stick Priority" with an arrow pointing left for ?

Thanks

Jgore  Smile
 
goboeing
Posts: 2428
Joined: Mon Jun 05, 2000 5:31 am

RE: Side Stick Priority. What Is It For?

Fri Feb 14, 2003 3:12 am

From meriweather.com:


When pressed:
Disconnects autopilot
When held in, deactivates the other Sidestick and allows full singular control. Holding switch for more than 30 seconds latches the system, allowing the switch to be released without losing priority.

A deactivated stick can be reactivated at any time by momentarily pushing either priority switch.

If the priority switches on both sidesticks are pushed, the last one activated assumes priority.
Illuminates Glareshield SIDE STICK PRIORITY lights and activates "PRIORITY LEFT" or "PRIORITY RIGHT" audio voice message according to control configuration.

Nick
 
gotAirbus
Posts: 791
Joined: Fri May 18, 2001 10:02 am

RE: Side Stick Priority. What Is It For?

Fri Feb 14, 2003 1:02 pm

Ok, another related question but this time, on an Embraer ERJ 145. Please pay special attention to what I'm going to say (for fear that i might say things in a vague fashion)

This picture has 2 screens: On the left screen (the HSI screen, I presume?) there is a place on the top where the green words AP and YD are. What I wanted to know is, what does the green arrow (above the AP/YD words) represent?

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Photo © Steve Hall



To get the green arrow, a pilot has to push an autopilot button called the "CPL" button on the upper panel. Pilots of the ERJ145 already know what I'm talking about. If you do not, look at the picture:

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Photo © Anthony Lindeman



What is the CPL button (the green arrow) for? Is its function more or less like the Airbus' "sidestick-priority".

(gotAirbus?)
(gotAIRBUS?) - (Got Commonality?) - (Have A Nice Flight!)
 
EssentialPowr
Posts: 1646
Joined: Wed Sep 06, 2000 10:30 pm

RE: Side Stick Priority. What Is It For?

Sun Feb 16, 2003 4:53 am

Note on the ERJ the 3 vertical buttons "AP", "CPL" and "YD".

The only way to select the a/p is w/ that single "AP" button. The "CPL" button shows which side the a/p is coupled to, in this pic it's coupled to the CA's side, so the CA controls the a/p. This, in essence, means the a/p will direct the a/c according to what the CA selects, ie NAV or FMS...The "YD" yaw damper is engaged automatically whenever the AP is selected.

cheers
 
LMP737
Posts: 4800
Joined: Wed May 08, 2002 4:06 pm

RE: Side Stick Priority. What Is It For?

Sun Feb 16, 2003 9:04 am

Around two years ago there was a story in Flight International about a Lufthansa A320 that had a "slight" problem with the captains sidestick. The captains sidestick had been replaced and the technicians performed an ops check of it. Unfortunately they did not take note of the direction of travel of the ailerons when they moved the sidestick. Upon takeoff there was a slight roll. Naturally the captain made a small correction. However the plane started to roll even more in that direction. Fortunately the FO realized what was going on and took over from the captain.

When the captains sidestick was inspected it was found to be miss-wired. The tech's did not notice on their ops check that the ailerons were moving the wrong way. Neither did the crew.

(Sorry, I don't have a link for the story. It's been a a while since the story came out. I remembered it because as an AMT you tend to remember something like that.)
Never take financial advice from co-workers.
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: Side Stick Priority. What Is It For?

Sun Feb 16, 2003 9:12 am

"The tech's did not notice on their ops check that the ailerons were moving the wrong way. Neither did the crew."

In fact, if the Captain had followed the correct pre-takeoff flight controls check procedure, a warning message would have been presented. This only appears if the control stick is held in the fully deflected position for 2 seconds (as per SOPs, of course...). Therefore, not only did he mis-interpret the flight controls position on the ECAM whilst doing the check (relatively understandable) but he didn't hold it long enough for a warning to be generated.

This is what I heard from a BA Airbus Captain shortly after the incident. I actually have no experience myself on the Airbus. The wing came very close to the ground by all accounts, and if it had not been for the First Officer's quick thinking, it could all have ended in tears.
I used to love the smell of Jet-A in the morning...
 
LMP737
Posts: 4800
Joined: Wed May 08, 2002 4:06 pm

RE: Side Stick Priority. What Is It For?

Mon Feb 17, 2003 4:18 am

Rick767:

Thanks for shedding a little more light on the incident. I've never worked on Airbuses so I'm not at all familiar with the systems on the A320 family.
Never take financial advice from co-workers.
 
racko
Posts: 4548
Joined: Tue Nov 06, 2001 12:06 am

RE: Side Stick Priority. What Is It For?

Mon Feb 17, 2003 8:19 am

As far as I remember, the connectors where mixed in a way that both the ECAM and the sidestick where crosswired - so the ECAM showed the direction of the movement of the sidestick - the aileron however moved in the opposite direction. I think I had read back then that the connectors are different between the A319 or A321, and the A320 in question and the technican used the wrong wiring list.
 
sccutler
Posts: 5555
Joined: Thu Jan 27, 2000 12:16 pm

RE: Side Stick Priority. What Is It For?

Mon Feb 17, 2003 2:00 pm

According to my friend (who has about 12,000 hours in type in 737s), they are "for airlines that can't afford to buy Boeings."

(Ducks to avoid onslaught of abuse...)

He said it, I hasten to add, in a jesting spirit, assures me he feels "perfectly comfortable" flying Airbii.
...three miles from BRONS, clear for the ILS one five approach...

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