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Forum: Aviation Safety Discussion Forum Yesterday, 08:09 PM
Replies: 8
Views: 198
Posted By Gabriel
That was tiiiiime ago. Now they have...

That was tiiiiime ago.

Now they have aithothrottle, fly-by-wire, and what not.
Forum: Aviation Safety Discussion Forum 08-29-2015, 03:19 AM
Replies: 8
Views: 193
Posted By Gabriel
I don't think that the tail boom (part of the...

I don't think that the tail boom (part of the fuselage behind the cockpit) would be the weakest link. I suspect some preexisting damage.

By the way, the typical failure mode of a sudden pullup is...
Forum: Aviation Safety Discussion Forum 08-29-2015, 03:09 AM
Replies: 8
Views: 193
Posted By Gabriel
Wow!!! It is the first plane that I know to be...

Wow!!! It is the first plane that I know to be rated to +/- 10G.

F-16 pilots have to be very special persons, and have very special training, and very special equipment, to withstand +9G, which is...
Forum: Aviation Safety Discussion Forum 08-29-2015, 03:02 AM
Replies: 8
Views: 193
Posted By Gabriel
Then I say it's engine failure.

Then I say it's engine failure.
Forum: Aviation Safety Discussion Forum 08-29-2015, 12:13 AM
Replies: 8
Views: 193
Posted By Gabriel
That is not control surface failure and the plane...

That is not control surface failure and the plane will not crash anywhere far from where the failure happened, even if the plane is at 500ft or higher.
Forum: Aviation Safety Discussion Forum 08-29-2015, 12:08 AM
Replies: 89
Views: 1,763
Posted By Gabriel
On the contrary, it is not accurate enough to...

On the contrary, it is not accurate enough to hold speed, because at high speed significant speed variations require small changes in AoA to keep 1G.

But it is perfect for AoA protection. That's...
Forum: Aviation Safety Discussion Forum 08-28-2015, 02:37 PM
Replies: 89
Views: 1,763
Posted By Gabriel
Evan, you are saying the same than me here: That,...

Evan, you are saying the same than me here: That, except for the envelope protections (alpha prot is an nevelope protection, hence the "prot" in there), the relationship between stick deflection and...
Forum: Aviation Safety Discussion Forum 08-28-2015, 02:32 PM
Replies: 89
Views: 1,763
Posted By Gabriel
-Three questions: 1- What happens in the...

-Three questions:

1- What happens in the scenario I presented above (normal law)?
2- You are flying an apporach on AP, get hit by a wind shear / microbrust and AoA exceeds alpha prot. Do the AoA...
Forum: Aviation Safety Discussion Forum 08-28-2015, 12:29 AM
Replies: 89
Views: 1,763
Posted By Gabriel
My understanding (which can be wrong because it...

My understanding (which can be wrong because it is mostly based on industry practices, not Airbus specific)


Yes, in the same way that they will limit what the human pilot can command, or mre...
Forum: Aviation Safety Discussion Forum 08-27-2015, 03:14 AM
Replies: 89
Views: 1,763
Posted By Gabriel
Evan, Even in an Airbus, with it's advanced...

Evan,

Even in an Airbus, with it's advanced FBW and very high systems integration, there is a clear distinction between the flight controls behavior and the autoflight system.

The control law...
Forum: Aviation Safety Discussion Forum 08-27-2015, 02:51 AM
Replies: 89
Views: 1,763
Posted By Gabriel
That is creative and clever to say the least!!!! ...

That is creative and clever to say the least!!!!

I don't know if it would work in practice, but it would be worth to analyze.

Some time back I had a similar thought. In my version the AP would...
Forum: Aviation Safety Discussion Forum 08-27-2015, 02:47 AM
Replies: 89
Views: 1,763
Posted By Gabriel
Nothing, almost (I think). Longitudinal...

Nothing, almost (I think).

Longitudinal motion wise (that is control of speed, pitch, AoA, altitude, vertical speed), alternate law (abnormal or not) is identical to normal law except for the...
Forum: Aviation Safety Discussion Forum 08-27-2015, 02:42 AM
Replies: 89
Views: 1,763
Posted By Gabriel
Point made.

Point made.
Forum: Aviation Safety Discussion Forum 08-27-2015, 12:17 AM
Replies: 89
Views: 1,763
Posted By Gabriel
What analogy? ;)

What analogy? ;)
Forum: Aviation Safety Discussion Forum 08-27-2015, 12:16 AM
Replies: 89
Views: 1,763
Posted By Gabriel
If (IF) that's the case, what we do? a)...

If (IF) that's the case, what we do?

a) Ensure that there is no foreseeable situation that is unsafe for manual flight.

b) Ensure that there are no foreseeable situation where the AP or AT...
Forum: Aviation Safety Discussion Forum 08-27-2015, 12:09 AM
Replies: 89
Views: 1,763
Posted By Gabriel
The plane should be "safe enough" in manual...

The plane should be "safe enough" in manual flight. If it's not, remove these conditions. I don't like a condition that is safe only if autoflight is available. Not until we get rid of the pilots...
Forum: Aviation Safety Discussion Forum 08-27-2015, 12:01 AM
Replies: 89
Views: 1,763
Posted By Gabriel
That's my point. I didn't propose that. I...

That's my point.


I didn't propose that. I proposed that the AP flies pitch and the AT flies thrust. They can look up the values in the tables faster, more accurately, and more reliably than the...
Forum: Aviation Safety Discussion Forum 08-26-2015, 11:52 PM
Replies: 89
Views: 1,763
Posted By Gabriel
Okay, but you can't compare the criticity of...

Okay, but you can't compare the criticity of losing the second engine vs losing the second ELAC, and that is part of the decision process of what is MELable or not. Risk = exposure * frequency *...
Forum: Aviation Safety Discussion Forum 08-26-2015, 03:52 PM
Replies: 89
Views: 1,763
Posted By Gabriel
Evan, in the the post before that one you said:...

Evan, in the the post before that one you said: "5) Notice that in the scenario where both ELAC's have failed and most of the envelope protections are lost, the aircraft no longer meets the alternate...
Forum: Aviation Safety Discussion Forum 08-26-2015, 03:33 PM
Replies: 89
Views: 1,763
Posted By Gabriel
Ok, yes, the UAS cannot be avoided with the...

Ok, yes, the UAS cannot be avoided with the current design of the speed sensors (pitots). But that's not what I meant, and I aknowledge that I was not clear enough.

GIVEN THE UAS, Airbus could...
Forum: Aviation Safety Discussion Forum 08-26-2015, 03:14 PM
Replies: 89
Views: 1,763
Posted By Gabriel
Aw, right, I meant Normal. Can you be...

Aw, right, I meant Normal.


Can you be more specific? Autothrust? (because I mentioned the low speed protections).


What speed stability? The remaining low speed portection? If it's that, I...
Forum: Aviation Safety Discussion Forum 08-26-2015, 05:38 AM
Replies: 89
Views: 1,763
Posted By Gabriel
No, we can't. We can't assume that they didn't...

No, we can't. We can't assume that they didn't either.
Forum: Aviation Safety Discussion Forum 08-26-2015, 05:31 AM
Replies: 89
Views: 1,763
Posted By Gabriel
I fully agree with all that, almost. The...

I fully agree with all that, almost. The exception is "most aircraft provide gauges (or flat panel readouts) to tell you about the air speed". The abnormal alternate law, the one that will leave you...
Forum: Aviation Safety Discussion Forum 08-26-2015, 05:21 AM
Replies: 89
Views: 1,763
Posted By Gabriel
For the record, not me. You do to play extra...

For the record, not me. You do to play extra careful attention to the airspeed and attitude though.


I totally agree with ATL and with your lump 3.


With the computers on... you can't even if...
Forum: Aviation Safety Discussion Forum 08-26-2015, 05:12 AM
Replies: 89
Views: 1,763
Posted By Gabriel
Evan, if I was one of the few that didn't twist...

Evan, if I was one of the few that didn't twist your words, there is a reason for that and I am still the same. I am not twisting your words. I quoted you immediately before my reply. Go and read...
Forum: Aviation Safety Discussion Forum 08-25-2015, 03:47 PM
Replies: 89
Views: 1,763
Posted By Gabriel
First of all, replace "unstable" for "indifferent...

First of all, replace "unstable" for "indifferent longitudinal stability", that means neither stable or unstable.

Second, it is not that it becomes stability indifferent. It IS stability...
Forum: Aviation Safety Discussion Forum 08-25-2015, 03:07 PM
Replies: 89
Views: 1,763
Posted By Gabriel
That is a discussion stopper for me. I can't...

That is a discussion stopper for me. I can't challenge that, or better, someone who says that.
Ok Evan, you are neither exaggerating nor crying so laud. Loosing both ELAC is comparable with lossing...
Forum: Aviation Safety Discussion Forum 08-25-2015, 03:54 AM
Replies: 89
Views: 1,763
Posted By Gabriel
Evan, don't exaggerate. Loosing an engine in a...

Evan, don't exaggerate.
Loosing an engine in a twin (which encompass 99.9% of the transport category planes today) also render the plane not airworthy and requires landing at the first suitable...
Forum: Aviation Safety Discussion Forum 08-25-2015, 03:45 AM
Replies: 89
Views: 1,763
Posted By Gabriel
It's the part of the FAR that requires the plane...

It's the part of the FAR that requires the plane to behave longitudinally stable, that is, things like to require a pull on the column to slow down, a push to speed up, and to return to the trim...
Forum: Aviation Safety Discussion Forum 08-24-2015, 04:32 PM
Replies: 52
Views: 1,570
Posted By Gabriel
If they were not of such a tragedy, I would say...

If they were not of such a tragedy, I would say that these photos are excellent. Unfortunately, they are very sad.

Very detailed close-up photos of the sequence of the crash. View at your...
Forum: Aviation Safety Discussion Forum 08-24-2015, 04:10 PM
Replies: 52
Views: 1,570
Posted By Gabriel
What? Control surface failure must be the least...

What? Control surface failure must be the least common cause. Yes it has happened, but unable to clear the ground in high Gs / high AoA pull ups out of dives and loss of control (tipically in a stall...
Forum: Aviation Safety Discussion Forum 08-24-2015, 04:01 PM
Replies: 52
Views: 1,570
Posted By Gabriel
Why? Was the fact that it was a vintage a factor?...

Why? Was the fact that it was a vintage a factor? It looks like the jet was respondoing quite well to the pilot's inputs.

Better ban pilots that don't design, train and perform the maneuvers well...
Forum: Aviation Safety Discussion Forum 08-24-2015, 03:55 PM
Replies: 52
Views: 1,570
Posted By Gabriel
Do you really need an altimeter at all to tell...

Do you really need an altimeter at all to tell that you are 5 and not 500 ft AGL???
Forum: Aviation Safety Discussion Forum 08-23-2015, 08:00 PM
Replies: 52
Views: 1,570
Posted By Gabriel
If he to survives and recovers to the point of...

If he to survives and recovers to the point of being able to defend himself, he should be prosecuted for involuntary murder or manslaughter.
Forum: Aviation Safety Discussion Forum 08-23-2015, 06:58 AM
Replies: 89
Views: 1,763
Posted By Gabriel
It shouldn't be that serious. If it is, then I...

It shouldn't be that serious. If it is, then I call it a design issue (not the failure itself, but that it becomes so serious).

Why? Because loss of autoflight and normal law can happen for a...
Forum: Aviation Safety Discussion Forum 08-22-2015, 02:57 AM
Replies: 40
Views: 1,446
Posted By Gabriel
Yes, that IS what you are reading. Read again....

Yes, that IS what you are reading. Read again. ADS will give better traffic visibility than current radar system. That is for ATC purposes. The better safety will be partially (hopefully not totally)...
Forum: Aviation Safety Discussion Forum 08-21-2015, 09:46 PM
Replies: 40
Views: 1,446
Posted By Gabriel
They are re-inventing ATC, changing from radar to...

They are re-inventing ATC, changing from radar to ADS. Midair avoidance is just a byproduct of ADS, it is not designed for that, and the implementation agenda is not based on midair avoidance.
...
Forum: Aviation Safety Discussion Forum 08-21-2015, 01:01 AM
Replies: 40
Views: 1,446
Posted By Gabriel
Evan, don't invent the wheel. A mode C...

Evan, don't invent the wheel.

A mode C transponder is much cheaper than a mode S transponder and it doesn't need a GPS.

Most airplanes that you think should have an ADS-B out already have a...
Forum: Aviation Safety Discussion Forum 08-20-2015, 04:12 PM
Replies: 40
Views: 1,446
Posted By Gabriel
Ok, the iPad (depending on the model) will also...

Ok, the iPad (depending on the model) will also include the GPS. You still need the dedicated receiver, transmitter, and baro-altitude encoding.

The problem is still with the word IF. Because if...
Forum: Aviation Safety Discussion Forum 08-20-2015, 03:01 PM
Replies: 40
Views: 1,446
Posted By Gabriel
Correct. But my understanding is that airplanes...

Correct. But my understanding is that airplanes not required today to have a transponder will not be required to have ADSB-out either. Basically, that would be airplanes used exclusivelly around the...
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