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Side Stick Priority. What Is It For?  
User currently offlineJgore From Argentina, joined Feb 2002, 550 posts, RR: 2
Posted (11 years 6 months 1 week 4 days 1 hour ago) and read 9672 times:

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 ?


Jgore  Smile

8 replies: All unread, jump to last
User currently offlineGoboeing From United States of America, joined Jun 2000, 2693 posts, RR: 15
Reply 1, posted (11 years 6 months 1 week 4 days 1 hour ago) and read 9661 times:

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.


User currently offlineGotAirbus From Singapore, joined May 2001, 851 posts, RR: 1
Reply 2, posted (11 years 6 months 1 week 3 days 15 hours ago) and read 9505 times:

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?) - (Got Commonality?) - (Have A Nice Flight!)
User currently offlineEssentialpowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 3, posted (11 years 6 months 1 week 1 day 23 hours ago) and read 9359 times:

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.


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 4, posted (11 years 6 months 1 week 1 day 19 hours ago) and read 9316 times:

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.)

User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 5, posted (11 years 6 months 1 week 1 day 19 hours ago) and read 9311 times:

"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...
User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 6, posted (11 years 6 months 1 week 1 day ago) and read 9243 times:


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.

User currently offlineRacko From Germany, joined Nov 2001, 4856 posts, RR: 20
Reply 7, posted (11 years 6 months 1 week 20 hours ago) and read 9218 times:

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.

User currently offlineSccutler From United States of America, joined Jan 2000, 5499 posts, RR: 28
Reply 8, posted (11 years 6 months 1 week 14 hours ago) and read 9200 times:

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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