Timeline for Has there ever been an uncommanded lowering of landing gear?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 12, 2020 at 0:03 | comment | added | Vikki | @OrganicMarble: Don't know, but I wouldn't be surprised. | |
| Sep 11, 2020 at 16:25 | comment | added | Organic Marble | That's pretty impressive. Is this the max speed achieved by a 747 that made it to a runway? | |
| Sep 11, 2020 at 5:25 | comment | added | Jan Hudec | Rollout, yes. The ground mode is rather special. On approach airliners normally crab all the way to touch-down and autoland usually has cross-wind limit of just 10 knots, so it's unlikely to differ from the normal yaw damper logic. | |
| Sep 11, 2020 at 0:52 | comment | added | Vikki | "because autopilot does not normally have any reason to manipulate rudder" - Ummm, autolanding? (Both to maintain runway alignment during approach in a crosswind, and to maintain directional control during rollout.) | |
| Jan 30, 2020 at 22:33 | history | edited | Vikki | CC BY-SA 4.0 |
Fixing wording.
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| Nov 10, 2019 at 11:45 | comment | added | Jan Hudec | there is similar note in A320 materials that says it will indicate the correct amount of rudder trim, but won't add it. Which does not mean it does not compensate anything—the normal law will keep wings level, and the yaw damper will probably add some rudder, but the plane will be in slight skidding turn. Regarding deleting features, keep in mind that the A320 control system was completely designed from the ground to be consistent and simple. A lot of things are completely different from A300. | |
| Nov 10, 2019 at 1:55 | comment | added | Vikki | @JanHudec: The A300/A310's autopilot does use the rudder to compensate for engine-failure-generated asymmetric thrust (see the footnote on page 19/33 of this AAR), and I would be surprised if they had removed that autopilot feature in their later airliners (given Airbus's automation fetish). | |
| Oct 23, 2019 at 9:26 | comment | added | Jan Hudec | as far as I know all autopilots, by design and very intentionally, don't handle asymmetric thrust. It is something nobody wants to have in an autopilot. Airbus will even indicate how much rudder trim should be added, but it requires pilots to do it. It would also have to be a special function, because autopilot does not normally have any reason to manipulate rudder, and nobody wants that either. | |
| Oct 23, 2019 at 1:54 | comment | added | Vikki | @JanHudec: In which case the autopilot was very poorly designed indeed, if it couldn't handle something as simple as asymmetric-thrust compensation. | |
| Oct 22, 2019 at 20:52 | comment | added | Jan Hudec | “despite the autopilot's attempts to counter the thrust asymmetry”—the thing is that autopilot doesn't know how to do that. It controls only pitch and roll and yaw damper independently controls rudder to damp the dutch roll only, so it won't apply the rudder as is needed for outboard engine failure. | |
| Oct 22, 2019 at 8:43 | history | answered | Vikki | CC BY-SA 4.0 |