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4th Jul 2019, 08:42
Replies: 1,976
Views: 1,667,521
Posted By zzuf

Must say have suspicion about Yoko1 after a brief...

Must say have suspicion about Yoko1 after a brief exchange.
Posts 630, 632, and 657.
He was quoting the static stability requirements of FAR25 in some detail, after stating that there are two types...
26th Jun 2019, 07:10
Replies: 1,976
Views: 1,667,521
Posted By zzuf

Great post!

Great post!
26th Jun 2019, 01:11
Replies: 1,976
Views: 1,667,521
Posted By zzuf

No, your answer was perfect, you don't quite...

No, your answer was perfect, you don't quite understand manoeuvre stability and how it may differ from longitudinal static stability.
But, I am at a total loss at how a situation where an aircraft...
25th Jun 2019, 13:10
Replies: 1,976
Views: 1,667,521
Posted By zzuf

How do you know that it is not related to...

How do you know that it is not related to manoeuvre stability?
After all MCAS = Manoeuvre Characteristics Augmentation system.
16th Jun 2019, 04:05
Replies: 1,976
Views: 1,667,521
Posted By zzuf

Megan, many years ago after the loss, overseas,...

Megan, many years ago after the loss, overseas, of a couple of T tailed aircraft in deep stall accidents OZ DCA sent a team overseas to examine the stall requirements then applied to transport...
15th Jun 2019, 06:25
Replies: 1,976
Views: 1,667,521
Posted By zzuf

1. Once again, FAR 25.255 is about pilot applied...

1. Once again, FAR 25.255 is about pilot applied mis-trim, it is a stand alone regulation that has nothing to do with system runaways. Do you have any evidence that FAR 25.255 is not effective for...
14th Jun 2019, 09:13
Replies: 1,976
Views: 1,667,521
Posted By zzuf

FDR you have totally misinterpreted the reason...

FDR you have totally misinterpreted the reason for the requirement contained in FAR25.255.
This standard was developed to address the "jet upset" problems experienced in the early days of jet...
12th Apr 2019, 10:42
Replies: 27
Views: 7,888
Posted By zzuf

Thanks Djpil, almost forgotten Appendix A. The...

Thanks Djpil, almost forgotten Appendix A.
The concern for me is that, in Australia, both CASA and ATSB, after many years, still promote this potentially dangerous misunderstanding.
ATSB...
12th Apr 2019, 05:38
Replies: 27
Views: 7,888
Posted By zzuf

have always thought of Va as the speed where if...

have always thought of Va as the speed where if you applied full control deflection, the surface would stall before it could provide enough force to exceed the max load factor of the aircraft meaning...
10th Apr 2019, 01:33
Replies: 27
Views: 7,888
Posted By zzuf

Once again ATSB investigators have shown their...

Once again ATSB investigators have shown their total misunderstanding of what Va is and what it isn't.
The claims in this report could be totally misleading to less experienced pilots.
Below is a...
9th Apr 2019, 10:14
Replies: 47
Views: 6,710
Posted By zzuf

I recall working with DL while he was a...

I recall working with DL while he was a departmental officer and during his later involvement as project engineer/TP with many of the aircraft I flew.
He made pretty nice violins as well.
But I...
8th Apr 2019, 12:08
Replies: 5,129
Views: 10,223,907
Posted By zzuf

Now why would a manufacturer limit the thumb...

Now why would a manufacturer limit the thumb switch trim range to even less than the autopilot trim authority, particularly when it could no longer be shown to trim throughtout the required envelope?...
5th Apr 2019, 11:51
Replies: 5,129
Views: 10,223,907
Posted By zzuf

My take would be that the aircraft could not...

My take would be that the aircraft could not comply with the 3 second trim operation, no load, required for electric trims for (CS 25.255(a)(1)).
So they declared that the manual trim wheel was the...
3rd Apr 2019, 09:45
Replies: 30
Views: 2,765
Posted By zzuf

Yes, welcome to the new certification world. It...

Yes, welcome to the new certification world.
It appears to be a lot that is not included in CFR part 23, I think it would be a mistake to think that compliance will now be easier, or that the...
3rd Apr 2019, 07:07
Replies: 30
Views: 2,765
Posted By zzuf

Either yes or no, depending on how compliance...

Either yes or no, depending on how compliance with FAR 23.701 is achieved.
https://www.risingup.com/fars/info/part23-701-FAR.shtml
24th Mar 2019, 12:10
Replies: 5,129
Views: 10,223,907
Posted By zzuf

For those keen on quoting the longitudinal static...

For those keen on quoting the longitudinal static stability requirements of FAR 25.175, Should note that the device in question is MCAS, ie manoeuvre, not static.
It is clear from the early...
Forum: Tech Log
23rd Mar 2019, 10:45
Replies: 21
Views: 3,336
Posted By zzuf

Not as heavily "grandfathered" as some seem to...

Not as heavily "grandfathered" as some seem to believe.
The changes in certification basis, and FAR25 amendment status for compliance of most 737 models is here:...
Forum: Tech Log
26th Feb 2019, 11:03
Replies: 47
Views: 12,770
Posted By zzuf

The requirement for a fuel jettison system...

The requirement for a fuel jettison system depends on climb performance at MTOW not the MTOW MLW Delta. FAR 25.1001
5th Dec 2018, 11:47
Replies: 2,098
Views: 1,097,737
Posted By zzuf

This is why I suspect the stall in question was...

This is why I suspect the stall in question was the power on, turning flight at 3kts per second deceleration rate. It is a very aggressive manoeuvre for a jet transport, requiring a high pitch...
5th Dec 2018, 05:04
Replies: 2,098
Views: 1,097,737
Posted By zzuf

I simply cannot see this. If the stab was...

I simply cannot see this.
If the stab was required to assist the elevator for controllability on this flight phase I would be looking closely at all longitudinal controllability tests required by...
4th Dec 2018, 23:57
Replies: 2,098
Views: 1,097,737
Posted By zzuf

That is actually what I was thinking. Had a...

That is actually what I was thinking. Had a series of questions planned to eventually get to what you have written.
From day one I concluded the MCAS was a response to a longitudinal static...
3rd Dec 2018, 12:00
Replies: 2,098
Views: 1,097,737
Posted By zzuf

Really interesting, can the aircraft be stalled...

Really interesting, can the aircraft be stalled with the MCAS operating?
2nd Dec 2018, 12:18
Replies: 2,098
Views: 1,097,737
Posted By zzuf

These comments just triggered a "time warp" for...

These comments just triggered a "time warp" for me!
Many years ago at Boeing Seattle on B734 we had to do a test point which required input of false flight condition information to the autothrottle....
2nd Dec 2018, 10:10
Replies: 2,098
Views: 1,097,737
Posted By zzuf

Thats is my understanding, but I am not sure why...

Thats is my understanding, but I am not sure why the increasing aircraft nose down bias applied by the elevator feel system at low speed is insufficient too maintain a stable stick force curve as the...
2nd Dec 2018, 00:41
Replies: 2,098
Views: 1,097,737
Posted By zzuf

You are correct. In a way the stall approach,...

You are correct. In a way the stall approach, actual stall, stall recovery and the post stall behaviour are a package. But at any part of the "package" the aircraft behaviour may become...
Showing results 1 to 25 of 161
 


 
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