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Search: Posts Made By: infrequentflyer789
Showing results 1 to 35 of 36
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Forum: Rumours & News
27th Nov 2019, 18:00
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Worse than that, for (2) a response is expected...

Worse than that, for (2) a response is expected in 3 (or 4, can't remember?) seconds whereas for MCAS to do it's job in (3) the pilot has to not notice the trim running for 9 seconds.

Possibly the...
Forum: Rumours & News
18th Nov 2019, 15:01
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

I agree, and at first sight it looks like PR have...

I agree, and at first sight it looks like PR have mangled engineering into something illogical, or the engineering is illogical - after all why would you stop an erroneous movement, that implies you...
Forum: Rumours & News
9th Nov 2019, 14:11
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Good, except most of Alice's problems and the...

Good, except most of Alice's problems and the bulk of Alices certification was done before Trumpty actually moved in...
Forum: Rumours & News
5th Nov 2019, 19:39
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

And of course the main competitor has one extra...

And of course the main competitor has one extra chute for more redundancy... (but still had a fail - in the one-chute-failed-by-design test...)
Forum: Rumours & News
4th Nov 2019, 16:07
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

JATR recommendation was "The FAA should review...

JATR recommendation was "The FAA should review the natural (bare airframe) stalling characteristics" - note that they didn't say "the FAA should do a bunch of new flight tests".

My take on it is...
Forum: Rumours & News
4th Nov 2019, 14:39
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

It isn't, those tests only identified the need...

It isn't, those tests only identified the need for original (AOA + g) MCAS, the later requirement for MCAS activation on AOA alone, and at lower speeds, was only identified during actual flight...
Forum: Rumours & News
3rd Nov 2019, 15:13
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

1,2) Redactions are either those done by Boeing...

1,2) Redactions are either those done by Boeing legal team as part of discovery, in which case they'll have the clean copy, and solid legal reasons for the redaction (most likely trade secrets,...
Forum: Rumours & News
30th Oct 2019, 15:15
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

You were very close - Peter Lemme's paper has now...

You were very close - Peter Lemme's paper has now been submitted and entered into the record of the Senate Committee hearings.

I guess it could still be used as expert witness report as well -...
Forum: Rumours & News
25th Oct 2019, 10:34
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

No, but the ET crew might have done, and I...

No, but the ET crew might have done, and I believe there were comments about other crews, before ET, briefing early autopilot engagement to protect against MCAS.

Of course, after ET it's clear...
Forum: Rumours & News
23rd Oct 2019, 13:04
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

The nose gear was made taller anyway, it's the...

The nose gear was made taller anyway, it's the mains that are short (well, same size as they ever were).
Forum: Rumours & News
23rd Oct 2019, 09:40
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

It was reported months ago that the actual test...

It was reported months ago that the actual test pilots were kept out of the loop on the MCAS changes and had no idea the production version was all hanging off a single sensor. Whether this was by...
Forum: Rumours & News
22nd Oct 2019, 21:46
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

I think there is more to it than that. Most of...

I think there is more to it than that. Most of the stuff in the JATR report was confirming what was already known or widely suspected, and therefore already priced in. The "test without MCAS"...
Forum: Rumours & News
21st Oct 2019, 10:26
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Not just that, my understanding is that the e-cab...

Not just that, my understanding is that the e-cab is supposed to be exactly the same computers running the same software as the actual plane, so saying it was faulty "simulator software" doesn't make...
Forum: Rumours & News
12th Oct 2019, 14:02
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Emphasis added.[/QUOTE] Yep, this all looks...

Emphasis added.[/QUOTE]

Yep, this all looks to be tied into the change to MCAS activation (and power) subsequent to first flight. It looks like JATR cannot determine whether or not this is the...
Forum: Rumours & News
12th Oct 2019, 08:42
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

FTFA (fly the f***ed-up aircraft) is not exactly...

FTFA (fly the f***ed-up aircraft) is not exactly a new idea either, and based on this and previous threads here there is no clear winning strategy that'll satisfy everyone.

I've only got part way...
Forum: Rumours & News
11th Oct 2019, 20:54
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

I think that's one possibility / interpretation,...

I think that's one possibility / interpretation, but back in June at theaircurrent.com...
Forum: Rumours & News
4th Oct 2019, 16:05
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

G-VHOT incident report suggests around 1 in 100k...

G-VHOT incident report suggests around 1 in 100k hours for AOA sensor (vane + resolver) failure rate, I'm sure I've seen similar numbers elsewhere as well. You then need the probability of failure...
Forum: Rumours & News
24th Sep 2019, 15:28
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

That presumption is an assumption that might not...

That presumption is an assumption that might not turn out to be valid. Absent reports of actual flight tests with MCAS (as it was) triggering, and knowing the the sims are now being found to be...
Forum: Rumours & News
22nd Sep 2019, 16:48
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

For the avoidance of doubt: I don't think moving...

For the avoidance of doubt: I don't think moving the stab to augment pitch control forces is wrong in principle, bypassing trim/pitch control safety systems to do it, is. You may consider that part...
Forum: Rumours & News
21st Sep 2019, 13:03
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

I hate to correct posts which I basically agree...

I hate to correct posts which I basically agree with, but that "single change" bit isn't actually true. There were hardware changes too, one in my opinion, critical.

MCAS overrides the aft-column...
Forum: Rumours & News
7th Sep 2019, 15:17
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

They must have asked for personal docs, or just...

They must have asked for personal docs, or just possibly asked for his copy of Boeing docs (including any that Boeing might have accidentally failed to locate, or accidentally located downstream of...
Forum: Rumours & News
5th Sep 2019, 13:39
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

How is this different to the aft column cutout...

How is this different to the aft column cutout switch which is already there?

I mean, yes, great idea, doesn't need any training because it's how the a/c did work and was understood to work...
Forum: Rumours & News
5th Sep 2019, 08:39
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

You'll lose. Given what is known about the...

You'll lose. Given what is known about the hardware capabilities of the FCC, both CPU and memory, anyone who could shoehorn an ML solution into the spare capacity left after several decades of...
Forum: Rumours & News
2nd Sep 2019, 12:33
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

[/left] Modern deterministic processors for...

[/left]
Modern deterministic processors for safety critical applications do exist (with a performance penalty vs mainstream processors, obviously), what you are really asking is how long can Boeing...
Forum: Rumours & News
23rd Aug 2019, 09:00
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Question, from an interface-design/engineering...

Question, from an interface-design/engineering point of view, what is then the rationale for EFS? To make the control column get heavier because (assuming working AOA sensors) we are approaching...
Forum: Rumours & News
29th Jul 2019, 14:33
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

I think (if I understand tdracer right) this...

I think (if I understand tdracer right) this particular risk analysis is for debris from one engine impacting the other engine - if it has enough energy to go through the engine and take out the...
Forum: Rumours & News
13th Jul 2019, 13:24
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

My reading: if the system is known to have...

My reading: if the system is known to have failed, it must warn of failure and fail inactive, and not activate just-in-case it might have been needed.



If the system detects erroneous sensor...
Forum: Rumours & News
12th Jul 2019, 10:46
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

All (civilian) fbw a/c with neutral stability...

All (civilian) fbw a/c with neutral stability control laws (C*) are certified under special conditions starting with A320 (actually arguably with Concorde but that was such a different beast it must...
Forum: Rumours & News
9th Jul 2019, 15:35
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Quite fascinating, and indeed sobering, thanks....

Quite fascinating, and indeed sobering, thanks. Would this be on NG sim or MAX (guessing the former)? - MAX will likely have less pitch-power couple and possibly less nose-down effect, as the thrust...
Forum: Rumours & News
9th Jul 2019, 12:15
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Off topic, but: there are other factors at play...

Off topic, but: there are other factors at play in that particular comparison, notably that the East Coast mainline is operating at max capacity already - they are actively trying to price pax off...
Forum: Rumours & News
7th Jul 2019, 10:45
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

The Tech Log refers to IFIM 27-31-00-810-803,...

The Tech Log refers to IFIM 27-31-00-810-803, presumably cleaning the connector is from that, following fault description of "feel diif press light".

This is maintenance magenta line - "feel diif...
Forum: Rumours & News
7th Jul 2019, 08:39
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

(a) we don't actually know that the AOA vane...

(a) we don't actually know that the AOA vane itself was the issue on LionAir (or ET, although there is more evidence of a vane failure mode in that case)
(b) if you are troubleshooting a problem...
Forum: Rumours & News
3rd Jul 2019, 12:18
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Seems pretty clear comparing the NG & MAX wiring...

Seems pretty clear comparing the NG & MAX wiring diagrams posted on this thread that the actual switch position is not captured by a sensor but rather the switch output is recorded, and on the MAX...
Forum: Rumours & News
13th Jun 2019, 20:37
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

Updating the chart to add the MAX (departures...

Updating the chart to add the MAX (departures count from airsafe.com) gives us:

https://cimg7.ibsrv.net/gimg/pprune.org-vbulletin/831x600/untitled_4579041f1614f40d46a0e4db42287f5c70d21293.png...
Forum: Rumours & News
12th Jun 2019, 12:35
Replies: 4,656
Views: 4,799,843
Posted By infrequentflyer789

FCeng84 has a profile saying they are a flight...

FCeng84 has a profile saying they are a flight control engineer in Seattle. FCeng84 had a habit of posting well written and accurate technical information sometimes before you could confirm that...
Showing results 1 to 35 of 36
 
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