Re: World's Challenging Approaches -6 |LXGB|3-3-2018|16:00Z |
Posted: Sat Mar 03, 2018 10:35 pm
@SHM
I can tell you aswell, that the autopilot goes through extreme testing, the control loop is tested in severe weather conditions far worse than what we were flying through. All through doing this, the aircraft is subjected to interruptions throwing the system off and it must remain stable, and it has passed all these tests. Therefore, I find it highly unlikely that the aircraft was at fault, especially considering no other incidents of this have ever occurred with this, or any of the IT-AUTOFLIGHT based autopilots.
I blame the poor weather system in FlightGear. I believe what happened is the AP was tripped off due to the weather update causing a temporary overspeed condion (even if only for a split second). This introduces a pitch up command from the FBW, which likely means the aircraft became stalled after climbing too high. At that altitude, even a small pitch up will cause it to go upwards toward the service ceiling. Keep in mind the only stall protection I have simulated so far is the ALPHA FLOOR function of the autothrottles.
The aircraft was not the root cause here, I am 100% sure of that, especially since I saw it fly through the service ceiling (on MPmap, then twist and fall to the ground), something that WILL cause a stall due to lack of engine power to compensate at that altitude.
My point is... please don't insult the aircraft without knowing what went wrong. The most likely scenario is the weather thing, which has happened once before, but this is not a fault with the aircraft, but with the weather system.
Kind Regards,
Josh
I can tell you aswell, that the autopilot goes through extreme testing, the control loop is tested in severe weather conditions far worse than what we were flying through. All through doing this, the aircraft is subjected to interruptions throwing the system off and it must remain stable, and it has passed all these tests. Therefore, I find it highly unlikely that the aircraft was at fault, especially considering no other incidents of this have ever occurred with this, or any of the IT-AUTOFLIGHT based autopilots.
I blame the poor weather system in FlightGear. I believe what happened is the AP was tripped off due to the weather update causing a temporary overspeed condion (even if only for a split second). This introduces a pitch up command from the FBW, which likely means the aircraft became stalled after climbing too high. At that altitude, even a small pitch up will cause it to go upwards toward the service ceiling. Keep in mind the only stall protection I have simulated so far is the ALPHA FLOOR function of the autothrottles.
The aircraft was not the root cause here, I am 100% sure of that, especially since I saw it fly through the service ceiling (on MPmap, then twist and fall to the ground), something that WILL cause a stall due to lack of engine power to compensate at that altitude.
My point is... please don't insult the aircraft without knowing what went wrong. The most likely scenario is the weather thing, which has happened once before, but this is not a fault with the aircraft, but with the weather system.
Kind Regards,
Josh