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21st Mar 2019, 02:31
Replies: 5,127
Views: 10,297,660
Posted By predictorM9

Sensor fusion is not an horribly complicated...

Sensor fusion is not an horribly complicated process. You can do it to estimate for example the AOA and airspeed from inertial data/servo/throttle information and a dynamical model of the airplane. I...
14th Mar 2019, 01:50
Replies: 5,127
Views: 10,297,660
Posted By predictorM9

For the AoA sensor and the pitch angle, these are...

For the AoA sensor and the pitch angle, these are not the same and so they disagree in general (the difference between the two is the angle of climb or descent, which is not always zero).
Even if...
14th Mar 2019, 00:10
Replies: 5,127
Views: 10,297,660
Posted By predictorM9

It is not as easy, remember there are a bunch of...

It is not as easy, remember there are a bunch of certification rules that basically require the algorithms to be simple enough and predictable enough.
The altitude does not change anything to the...
Forum: Tech Log
15th Jun 2013, 09:02
Replies: 976
Views: 146,133
Posted By predictorM9

I have a question regarding all these laws: was...

I have a question regarding all these laws: was it put somewhere on the ECAM that the plane was now in Alternate 2B law? The ECAM just says "Alternate", which is pretty vague. Does it matter to know...
Forum: Tech Log
14th Apr 2013, 17:52
Replies: 976
Views: 146,133
Posted By predictorM9

Not entirely though. Because there is a maximal...

Not entirely though. Because there is a maximal alpha prot for the low machs, and they could take this one into account even with lost airspeeds, i.e. they could have limited the trim up say up to 14...
Forum: Tech Log
14th Apr 2013, 00:09
Replies: 976
Views: 146,133
Posted By predictorM9

It should, but from the data on the leaked...

It should, but from the data on the leaked report, when the copilot puts the stick full nose down for two seconds, the elevator goes from 30 degrees pitch up to 20 degrees pitch up. How fast is the...
Forum: Tech Log
12th Apr 2013, 19:34
Replies: 976
Views: 146,133
Posted By predictorM9

It says: "Dans cette phase de vol, la...

It says:

"Dans cette phase de vol, la poussée maximale appliquée a un effet à cabrer non négligeable ,' le
THS est en butée à cabrer et s'ajoute donc à l'effet à cabrer; la loi de pilotage Nz (à...
Forum: Tech Log
12th Apr 2013, 19:29
Replies: 976
Views: 146,133
Posted By predictorM9

What the report says is that the full deflection...

What the report says is that the full deflection of the elevator down was not achieved with this input, because of the alt2b law. While the same law gives the full deflection of elevator up when the...
Forum: Tech Log
12th Apr 2013, 16:59
Replies: 976
Views: 146,133
Posted By predictorM9

stall recovery in AF447

I just read the leaked (French) experts report on AF447 (I won't put the link here, just google it) and it explicitly mentions that the plane may not have been recoverable at all because of the...
Forum: Tech Log
4th Aug 2011, 16:01
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

I don't think that the airbus design philosophy...

I don't think that the airbus design philosophy of a sidestick without feedback has caused the accident. Also, how do you generate the feedback when the speed data is lost? You can synthetize...
Forum: Tech Log
1st Aug 2011, 10:13
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

Actually if you look at the variometer data from...

Actually if you look at the variometer data from the BEA report, it is not pinned to the bottom, but also flickers too.

Conclusion:
- failure from the pilots to realize that the variometer data...
Forum: Tech Log
1st Aug 2011, 07:45
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

No, the speed of less than 60 kts wasn't real....

No, the speed of less than 60 kts wasn't real. The relative wind speed was always above 60 kts, just by looking at the vario and ground speed it is actually above 100 kts.
So the AOA data shouldn't...
Forum: Tech Log
1st Aug 2011, 06:10
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

"According to many prior posts here, the Stall...

"According to many prior posts here, the Stall Warning shuts off below 60 kt IAS. Why they have IAS input to SW is beyond me. The DC-10, for example, uses only AOA for SW.

Regardless of IAS,...
Forum: Tech Log
31st Jul 2011, 14:41
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

Yes but this goes even beyond that... even if you...

Yes but this goes even beyond that... even if you don't want to display the AOA info to the pilot (which I can admit), I don't understand why you would start to exclude what one sensor is saying...
Forum: Tech Log
31st Jul 2011, 14:14
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

[Static pressure system was totally unaffected.] ...

[Static pressure system was totally unaffected.]

Mhhh... I may be wrong, but if the static pressure system was totally unaffected, why does the vertical speed graph (page 109 of the report, second...
Forum: Tech Log
18th Jun 2011, 13:44
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

Thanks MM43, I understand better about the...

Thanks MM43, I understand better about the stability.
But still, in post 1393 it says that the elevators are also fully stalled, so can they still have some nose down authority? And also, what...
Forum: Tech Log
18th Jun 2011, 09:42
Replies: 3,435
Views: 1,349,665
Posted By predictorM9

Deep stall hypothesis

Hello,

I'm not a professionnal pilot, but I have some basic understanding of physics and aerodynamics. I have multiple questions regarding AF 447:

First: how can the angle of attack can be that...
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