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Search: Posts Made By: Machinbird
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Forum: Tech Log
17th Feb 2012, 15:01
Replies: 1,412
Views: 467,744
Posted By Machinbird

Roulishollandais, you may have mis-perceived this...

Roulishollandais, you may have mis-perceived this interchange.

Basically When Iceman50 stated he was a Naval Aviator, I knew exactly what his training background was before his airline career,...
Forum: Tech Log
13th Feb 2012, 18:51
Replies: 1,412
Views: 467,744
Posted By Machinbird

Thank you for the correction CONF iture. I see I...

Thank you for the correction CONF iture. I see I must have misinterpreted the following statement's meaning:O:
Forum: Tech Log
13th Feb 2012, 15:20
Replies: 1,412
Views: 467,744
Posted By Machinbird

Looks like the PPrune Administrators have fixed...

Looks like the PPrune Administrators have fixed the problem by moving the thread into tech section. It is a natural progression for long term threads it seems.

Iceman, the problem as I see...
Forum: Tech Log
13th Feb 2012, 06:23
Replies: 1,412
Views: 467,744
Posted By Machinbird

Iceman, I apologize for stepping on the toes of a...

Iceman, I apologize for stepping on the toes of a real Airbus Pilot , however you must admit that in the light of subsequent discussion, your statements were not quite accurate.

I am a retired USN...
Forum: Tech Log
13th Feb 2012, 05:21
Replies: 1,412
Views: 467,744
Posted By Machinbird

Take a look at this article from Flight Global...

Take a look at this article from Flight Global about the Legacy 500 Bizjet: Boeing inspects 787s after aft fuselage composite delamination - FlightBlogger - Aviation News, Commentary and Analysis...
Forum: Tech Log
12th Feb 2012, 22:33
Replies: 1,412
Views: 467,744
Posted By Machinbird

For conventional non-FBW aircraft and Boeing FBW,...

For conventional non-FBW aircraft and Boeing FBW, it looks like the well known phugoid where the nose drops as you slow from trim speed. (But let me preface this with the statement that my Boeing...
Forum: Tech Log
12th Feb 2012, 21:25
Replies: 1,412
Views: 467,744
Posted By Machinbird

Auto-trim is a has been with us some time and has...

Auto-trim is a has been with us some time and has been known for causing trouble. Pilots first began to run afoul of it with the early autopilots that would trim unbeknownst to the crew-until it...
Forum: Tech Log
12th Feb 2012, 18:23
Replies: 1,412
Views: 467,744
Posted By Machinbird

What PF was doing would make better sense if his...

What PF was doing would make better sense if his PFD had a ~ 12 degree pitch bias, but I don't think that happened. Instead, he was probably trying to maintain around 1 g and the harder he tried,...
Forum: Tech Log
12th Feb 2012, 15:22
Replies: 1,412
Views: 467,744
Posted By Machinbird

Let us correct this popular misconception. ...

Let us correct this popular misconception. Initially PF did not yank full back stick. His average aft stick was about 6 degrees out of 16 degrees possible for the first 10 seconds. What he was...
Forum: Tech Log
11th Feb 2012, 21:11
Replies: 1,412
Views: 467,744
Posted By Machinbird

Iceman. My first impression was that you had...

Iceman.
My first impression was that you had done your sim evaluation in a Boeing type sim, but I see you list yourself as a 'Bus pilot, seat 0A, so will give you the benefit of the doubt.

...
Forum: Tech Log
10th Feb 2012, 20:11
Replies: 1,412
Views: 467,744
Posted By Machinbird

Let us not confuse automation, basic irreversible...

Let us not confuse automation, basic irreversible hydraulic controls, and the benefits of good aerodynamic design.
What told the THS to go up was not the high level of automation that the 'Bus...
Forum: Tech Log
10th Feb 2012, 17:27
Replies: 1,412
Views: 467,744
Posted By Machinbird

Another weakness of the design. A large...

Another weakness of the design. A large transport aircraft should need two hands to hold it in a stall, not a crooked pinky finger. :rolleyes:

Granted, there are other transports that do not...
Forum: Tech Log
10th Feb 2012, 15:46
Replies: 1,412
Views: 467,744
Posted By Machinbird

Let me agree with this particularly with regard...

Let me agree with this particularly with regard to the aircraft pitch trim system.
An aircraft that keeps trimming the force off the stick/wheel as you slow might be convenient, but it loses...
Forum: Tech Log
6th Feb 2012, 05:24
Replies: 1,412
Views: 467,744
Posted By Machinbird

I was just thumbing through my copy of "Aviation...

I was just thumbing through my copy of "Aviation Safety and Pilot Control" by the National Research Council. There were an interesting couple of paragraphs that I will quote:

Time marches...
Forum: Tech Log
30th Jan 2012, 06:01
Replies: 1,412
Views: 467,744
Posted By Machinbird

Hi PJ2, Thank you for confirming my understanding...

Hi PJ2, Thank you for confirming my understanding of 'Bus roll control response, and refuting my understanding that a pulsing technique was the norm with the Airbus. I guess a lot of these videos by...
Forum: Tech Log
29th Jan 2012, 21:08
Replies: 1,412
Views: 467,744
Posted By Machinbird

Hand Flying

What are the odds of requesting a block altitude and getting it like we used to do in the military? Wouldn't need to do it very long. Even 10 minutes worth would be significant.

Perhaps with a...
Forum: Tech Log
29th Jan 2012, 06:24
Replies: 1,412
Views: 467,744
Posted By Machinbird

Thank you OK465, that is useful data.:ok: By...

Thank you OK465, that is useful data.:ok:
By itself, the display lag should not enable an oscillation. About what I was expecting.

I would personally expect somewhat ponderous response...
Forum: Tech Log
28th Jan 2012, 19:58
Replies: 1,412
Views: 467,744
Posted By Machinbird

That was the core of PF's (Bonin's) initial...

That was the core of PF's (Bonin's) initial control problem that night, that and the fact that his initial lateral control correction was far too large.

In the clag and at night, the only...
Forum: Tech Log
28th Jan 2012, 01:33
Replies: 1,412
Views: 467,744
Posted By Machinbird

I'll probably get shot down by a real 'Bus pilot,...

I'll probably get shot down by a real 'Bus pilot, but as I understand, that stick deflection in the 'Bus is essentially commanding a rate, not a control deflection. Zero control deflection equals...
Forum: Tech Log
25th Jan 2012, 17:08
Replies: 1,412
Views: 467,744
Posted By Machinbird

IMHO it would. :ok: Now all they need is to...

IMHO it would. :ok:

Now all they need is to visually separate the upper Red area from the lower Red area so that someone walking in on a situation cannot possibly get the two confused.
Maybe a...
Forum: Tech Log
25th Jan 2012, 02:51
Replies: 1,412
Views: 467,744
Posted By Machinbird

The arrows appear to be an unfortunate choice of...

The arrows appear to be an unfortunate choice of shape. The angled part of the arrow head is there to indicate whether you are just beginning to get into trouble (The tip of the arrow) or are fully...
Forum: Tech Log
23rd Jan 2012, 16:25
Replies: 1,412
Views: 467,744
Posted By Machinbird

Ok illustration however this is a too fast...

Ok illustration however this is a too fast indication.
For too slow, you would be in the bottom red sector.
The arrow shapes seem a bit counter intuitive since they bear opposite relationship to...
Forum: Tech Log
20th Jan 2012, 15:44
Replies: 1,412
Views: 467,744
Posted By Machinbird

Actually not. Agreed that if you are flying, it...

Actually not. Agreed that if you are flying, it is your problem to solve right now. Later, if you are still among the living, it becomes someone else's problem.

But the causative factor is...
Forum: Tech Log
20th Jan 2012, 03:22
Replies: 1,412
Views: 467,744
Posted By Machinbird

With regard to post 1087's link. Not rubbish at...

With regard to post 1087's link. Not rubbish at all.
For example this quote from the original article:
About a month and a half ago I concluded over on the tech thread that this was initially a...
Forum: Tech Log
17th Jan 2012, 00:46
Replies: 1,412
Views: 467,744
Posted By Machinbird

Yes, and there would have been hydraulic failures...

Yes, and there would have been hydraulic failures as well. Didn't happen.
Forum: Tech Log
25th Dec 2011, 16:21
Replies: 1,412
Views: 467,744
Posted By Machinbird

Once stabilized in the 10,000 fpm descent, they...

Once stabilized in the 10,000 fpm descent, they were experiencing ~1 g. Since the aircraft was generating much less lift with the wings and much more drag with the fuselage (a form of lift since...
Forum: Tech Log
16th Dec 2011, 15:23
Replies: 1,412
Views: 467,744
Posted By Machinbird

Couldn't agree more. Among the 3 in the...

Couldn't agree more.

Among the 3 in the front office, there must have been an active case of denial. Something along the lines of, "We can't be stalled, the computers must have gone bonkers."...
Forum: Tech Log
16th Dec 2011, 03:23
Replies: 1,412
Views: 467,744
Posted By Machinbird

Yep, that is exactly what I would do. Warn the...

Yep, that is exactly what I would do. Warn the guy twice what he needs to fix, if time permits, then if he can't control it, tell him I have it and what I want him to do.
And if he doesn't keep his...
Forum: Tech Log
16th Dec 2011, 01:13
Replies: 1,412
Views: 467,744
Posted By Machinbird

SENTENCE FRAGMENT

Per the BEA 3rd report, commencing at 2h 10min 27, there were a series of criticisms from the PNF that are altitude related. At 2h 10min 36 there was a comment that from the context would have...
Forum: Tech Log
15th Dec 2011, 16:34
Replies: 1,412
Views: 467,744
Posted By Machinbird

As you no doubt surmised, unless you are flying a...

As you no doubt surmised, unless you are flying a thrust vectored overpowered aircraft such as an F-22, the transit of 0 airspeed is just that, transitory. You pull the nose up to vertical and let...
Forum: Tech Log
15th Dec 2011, 15:40
Replies: 1,412
Views: 467,744
Posted By Machinbird

But that is actually a fouled up design decision....

But that is actually a fouled up design decision. AF447 always had adequate airspeed to properly deflect the AOA sensors on its way down. It was just that the speed sensing system didn't know how...
Forum: Tech Log
19th Oct 2011, 19:50
Replies: 1,412
Views: 467,744
Posted By Machinbird

Aileron Drag AD, no, you are quite on target. ...

Aileron Drag
AD, no, you are quite on target. His approach is often skewed from physical reality.
But sometimes he has his points. Just pick and choose what you want to actually consider and...
Forum: Tech Log
19th Oct 2011, 16:35
Replies: 1,412
Views: 467,744
Posted By Machinbird

Dozy, I don't think that is correct. Letting go...

Dozy, I don't think that is correct. Letting go would cause the aircraft to hold an attitude as long as it was above stall speed. Below stall speed it will bobble its nose up and down. It needs...
Forum: Tech Log
16th Oct 2011, 00:03
Replies: 1,412
Views: 467,744
Posted By Machinbird

Dozy, it isn't exactly a democracy in the...

Dozy, it isn't exactly a democracy in the cockpit. It is more of a meritocracy. You warn the other person that they are f'ing up if time permits and then act if you hope to be bouncing your grandkids...
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