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16th Dec 2019, 13:13
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

Didn't the NG ship with a (non-optional) AoA...

Didn't the NG ship with a (non-optional) AoA comparison and disagree warning? And wasn't the omission of this warning in the Max discovered by Boeing late in development (or after certification)? ...
15th Dec 2019, 15:33
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

If the AoA divergence was caused by the vane...

If the AoA divergence was caused by the vane departing the aircraft, then they wouldn't have to look very far because that would have happened within about 6 seconds (~1,500') of WOW.

It has been...
2nd Dec 2019, 23:28
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

It did not take 18 seconds for the ET302 crew to...

It did not take 18 seconds for the ET302 crew to recognize the erroneous nose-down trim and respond. Nor was the time to recognize and begin to respond "fatal."

The first MCAS nose-down trim...
24th Nov 2019, 17:32
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

I had a similar question about flaps. Why is...

I had a similar question about flaps. Why is MCAS disabled with flaps deployed? Does the stick force curve meet regulatory requirements when flaps are deployed (even at flaps 1)?
20th Nov 2019, 19:55
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

The FCOM Bulletin No. TBC-19, dated November 6,...

The FCOM Bulletin No. TBC-19, dated November 6, 2018 (the day before the AD), includes the following:



The Multi Operator Message sent by Boeing on November 10, 2018 included the following:

...
2nd Nov 2019, 20:46
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

The Aviation Week article doesn't provide a copy...

The Aviation Week article doesn't provide a copy of the 2015 e-mail. Natalie Kitroeff posted the Fazio's' PPT slide onTwitter but it is heavily redacted, partially obscured by a big blue circle with...
14th Oct 2019, 00:41
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

I'm going to get slammed by the ATP's for this,...

I'm going to get slammed by the ATP's for this, but what the heck.

Sullenberger's letter, like his congressional testimony, reads like an audition for a job as an expert witness in the many...
6th Oct 2019, 16:48
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

If you "could have a lengthy argument about [my]...

If you "could have a lengthy argument about [my] statement", then you could probably also summarize so it would be less lengthy.

And it's far from clear why that would be off topic. The thread...
4th Oct 2019, 17:36
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

There seems to be an assumption in the article...

There seems to be an assumption in the article and in the comments that a retrofitted EICAS would have been likely to have prevented these two accidents. How realistic is that assumption?

In...
10th Sep 2019, 23:07
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

The answers to some of these might be obvious,...

The answers to some of these might be obvious, but I thought I'd ask anyway . . .

It's not clear what "uncommanded MCAS activation" means. Do they mean MCAS is activated even when the FCC is...
6th Sep 2019, 01:00
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

As they say, "the perfect is the enemy of the...

As they say, "the perfect is the enemy of the good." My main point is that they could have done something--less than perfect, less even than pretty good--but they did nothing. That tells me that...
5th Sep 2019, 19:30
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

The AoA indicator in JT610 was north of 20...

The AoA indicator in JT610 was north of 20 degrees when sitting on the ground at zero airspeed. Surely that was enough to trigger a sanity check of inputs. Even in flight, something more than 20...
31st Aug 2019, 21:43
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

I spent 16 years coding and managing software...

I spent 16 years coding and managing software development. About half of my sw career involved a large body of system software written in assembler. I am fully aware of what's involved in the...
31st Aug 2019, 04:31
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

[/left] How much would it have cost them to...

[/left]
How much would it have cost them to perform some kind of sanity check on the AoA input (assuming single sensor input)? Zero.
How much would it have cost them to design MCAS so that it...
25th Aug 2019, 01:05
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

The climb was arrested when flaps retracted. The...

The climb was arrested when flaps retracted. The climb was shallow to begin with. Look at the Reuters graphics comparing the ET302 accident flight climb profile with other flights leaving Addis...
14th Aug 2019, 18:11
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

It is conceivable that the Eaton motor assembly...

It is conceivable that the Eaton motor assembly knows the position of the stabilizer (although I've seen no evidence of that). It is a lot harder to believe that Boeing would bake flight dynamics...
14th Aug 2019, 16:56
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

I assume you are talking about the ET302...

I assume you are talking about the ET302 Preliminary Report. Where does it "indicate that the the crew attempted to use MET at larger tail angles, but without movement"?

The second MCAS...
6th Aug 2019, 13:33
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

That's not what the article says: "For these...

That's not what the article says:

"For these simulations, the five bits flipped were chosen in light of the two deadly crashes to create the worst possible combinations of failures to test if the...
5th Aug 2019, 19:58
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

1. I'm discussing the information about the...

1. I'm discussing the information about the simulator scenario described in the Gates Seattle Times article. If that information is wrong, then my comments about the scenario are irrelevant.
...
5th Aug 2019, 02:49
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

The malfunction also involved flipping a bit to...

The malfunction also involved flipping a bit to fool the FCC computer into thinking MCAS was active, which disabled the control column cut-out switches from stopping the runaway trim. One or more of...
3rd Aug 2019, 02:20
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

Interestingly, none of the reporting has said...

Interestingly, none of the reporting has said just how likely the test scenario was to occur in flight, other than to say it was "esoteric," or "theoretical," or "extremely improbable."

The test...
29th Jul 2019, 07:12
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

Why do you say that it does not appear that the...

Why do you say that it does not appear that the aircraft was underperforming? There was no "steep climb followed by a slight power reduction from takeoff thrust to climb thrust." There was no steep...
28th Jul 2019, 02:35
Replies: 4,656
Views: 4,165,705
Posted By Notanatp

Perhaps this was a symptom of being overweight?...

Perhaps this was a symptom of being overweight? Not only did the captain ask to continue runway heading and say flight control problems, but the DFDR data looks a little odd (at least to me). There's...
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