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Switching AP on Control Transfer
Does anyone know of any benefits of switching the Autopilot over to the side of pilot with control when control is handed over for short periods of time i.e. washroom breaks etc.? I'm talking here specifically about Airbus and switching between AP1 and AP2.
Are there any threats associated with flying the aircraft with the offside AP in control. Obviously it is recieving all it's data from the offside sensors and computers, and the threat here is that if there is a discrepancy between the two sides. But other than that any others? One would assume here that during cruise there are no major discrepancies, or that they've been sorted well before control is handed over. |
Never seen anyone switch autopilots for short periods such as breaks.
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Originally Posted by Check Airman
(Post 10265481)
Never seen anyone switch autopilots for short periods such as breaks.
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In the old dark ages it was used by some carriers as a reminder of who was flying the aeroplane . Had thought it had died a death some eons ago.
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Does anyone know of any benefits of switching the Autopilot over to the side of pilot with control when control is handed over for short periods of time Let’s hope you are never faced with an emergency! |
Originally Posted by Capt Fathom
(Post 10265723)
I just don’t understand where people get this **** from? Can’t you think things through for yourself anymore? Let’s hope you are never faced with an emergency! |
Originally Posted by donpizmeov
(Post 10265588)
In the old dark ages it was used by some carriers as a reminder of who was flying the aeroplane . Had thought it had died a death some eons ago.
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KAL did (does?) that. They don't like incongruity (no matter the insignificance).
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Capt Fathom : I was one of the early crews to convert onto the A330 at Toulouse in 1994 and AP switching was in fact the SOP taught by the Airbus instructors at that time! That's probably where it came from.
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Good question! I would advise against switching AP’s for temporary PF/PM switching on the A320/A330. It can create quite an unexpected jerk beyond of what the AP would normally command. The reason for this is the presence of a minor FD mismatch due to onside Air Data / IR data not being 100% synchronised. This is noticeable in cruise when ADR 1 and ADR 2 altitude are slightly different. (But well within RVSM tolerances) Also the FD mismatch occurs frequently in managed descent where the vertical profile differs between Capt and F/O side, this is directly caused by differing onside IR data (wind, GS etc). For prolonged taskswitching it would be advisable to switch AP when possible because this allows you to monitor the AP performance. I.e. is the FD being followed or not. hope this helps |
Originally Posted by Check Airman
(Post 10265824)
One would think that if you looked across and saw the other seat was empty, it would be obvious who's flying. I get a chuckle when the other person gets up for a lav break and announces that I have control or I have the radio.;)
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If you change the pressure setting on your side because the other guy is out of the room or whatever, it will fly according to the onside FD so even if you've got STD on your side and QNH on the other, the autopilot will do it's job with the associated AP. Technically, i'd imagine that TCAS should probably also be swapped over if you change control as the TCAS will fly according to the pressure setting selected on the associated FD, although perhaps it works in STD at all times to avoid altimetry errors, i don't know.
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Shouldn't the AP be slaved to the onside mode C?
Unnecessary overcomplication switching APs, KISSFFS |
Originally Posted by maggot
(Post 10266229)
Shouldn't the AP be slaved to the onside mode C?
Unnecessary overcomplication switching APs, KISSFFS |
Playing with the baro setting has no effect on the TCAS. It always uses standard regardless of the pilots baro setting. with AP1, AP holds altitude using ADR 1. So you want to transmit the most accurate altitude the AP is using so you will put ATC sys 1 and vice versa. If you pay attention when you are in alt or cruise, the altitude is always more precise on the side the AP is engaged. |
Can you select a different autopilot on an Airbus without disconnecting it ? On all Boeing’s I’m familiar with it won’t let you connect a different autopilot unless you disengage and then reselect the desired AP |
No need to disconnect autopilots on an Airbus. Pushing the other button will (usually) seamlessly switch autopilots.
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On the 737 you can.
Originally Posted by stilton
(Post 10268390)
Can you select a different autopilot on an Airbus without disconnecting it ? On all Boeing’s I’m familiar with it won’t let you connect a different autopilot unless you disengage and then reselect the desired AP |
Ok, not on our 75/ 67 fleet if you attempt to select a different autopilot in flight nothing happens, the MCP just doesn’t accept the input You have to disengage then reselect a different autopilot |
Can I just point out that the aircraft doesn’t know or care who is flying the aircraft or which seat they are in. |
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