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Search: Posts Made By: FCeng84
Showing results 1 to 35 of 71
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Forum: Rumours & News
28th Mar 2019, 06:38
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

JR - your story about automatic retraction of the...

JR - your story about automatic retraction of the inboard leading edges at high AOA on the Falcon 900 reminds me of stall characteristics on the original 777. As an airplane approaches stall you...
Forum: Rumours & News
28th Mar 2019, 03:19
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

AOA vane position is not valid until up to an...

AOA vane position is not valid until up to an airspeed well above that for taxi. Revised MCAS logic keeps MCAS from acting at all if an AOAs signals differ by anywhere near as much as appears to have...
Forum: Rumours & News
28th Mar 2019, 02:34
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

The UAS on Lion Air resulted from the left and...

The UAS on Lion Air resulted from the left and right airspeed signals not tracking each other. This was most likely caused by the the left /right sensed AOA difference, but declaring UAS did not...
Forum: Rumours & News
27th Mar 2019, 11:42
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Please explain what you mean by “Stall ID”. Also...

Please explain what you mean by “Stall ID”. Also please describe “737Ng Stall ID trimming”. I am very familiar with the term “Stall ID” as part of the regulations but not in this context.
Forum: Rumours & News
26th Mar 2019, 23:07
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Several people have asked MCAS clarification...

Several people have asked MCAS clarification questions in response to some of my recent posts. Rather than respond to them individually I offer the following as hopeful a fairly comprehensive...
Forum: Rumours & News
26th Mar 2019, 17:10
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

One of the key elements to the baseline MCAS...

One of the key elements to the baseline MCAS logic is that it will only put in a single increment of stabilizer motion as long as no pilot trim command is given. This goes in over no more than 10...
Forum: Rumours & News
26th Mar 2019, 16:53
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

The only time that stabilizer positioning...

The only time that stabilizer positioning requires or even benefits from reference to the absolute position of the stabilizer is when on ground, preparing for takeoff. When in air, pilot commanded...
Forum: Rumours & News
25th Mar 2019, 19:52
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Here we are 15 days and 2500+ posts into a thread...

Here we are 15 days and 2500+ posts into a thread about an accident for which we have not yet seen the FDR info nor heard anything about the crew conversations from the CVR and we are already saying...
Forum: Rumours & News
25th Mar 2019, 05:52
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

I must take issue with the statement that "MCAS...

I must take issue with the statement that "MCAS overides controls". MCAS commands the horizontal stabilizer but does not override pilot commands to that or any surface. At any time that MCAS...
Forum: Rumours & News
25th Mar 2019, 00:44
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

This depends on what you call stability. If...

This depends on what you call stability. If stability is the tendency to pitch back down in response to having pitched up, MCAS can be viewed as increasing pitch stability
Forum: Rumours & News
25th Mar 2019, 00:08
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Please indulge my adding a few comments. Today’s...

Please indulge my adding a few comments. Today’s commercial aviation has embraced use of automation to enable optimization for performance. This has led to configurations that do not have certifiable...
Forum: Rumours & News
24th Mar 2019, 22:28
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

As expected given the Lion Air accident, most of...

As expected given the Lion Air accident, most of the focus on MCAS has been on how it behaves with the AOA signal it is using failed high. When MCAS has proper AOA data it meets the noted static...
Forum: Rumours & News
23rd Mar 2019, 19:41
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Hopefully Boeing will make the details of the...

Hopefully Boeing will make the details of the MCAS modification clearer soon. MCAS in its original implementation would run again in the presence of AOA failed high following any amount of pilot...
Forum: Rumours & News
23rd Mar 2019, 19:27
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Consider the situation of the airplane being...

Consider the situation of the airplane being loaded to its aft CG limit but the stabilizer trimmed full nose up or the opposite of forward CG with full nose down stabilizer. In either of these cases...
Forum: Rumours & News
23rd Mar 2019, 09:33
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Beyond that it is clearly a violation of the FARs...

Beyond that it is clearly a violation of the FARs for a system to have a failure mode arrived at by (1) any combination of failures whose probability is greater that 1x10E-9 or (2) any single failure...
Forum: Rumours & News
23rd Mar 2019, 04:02
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

I believe that manual statement refers to the...

I believe that manual statement refers to the design criteria that continued safe flight and landing must be possible with the horizontal stabilizer frozen in any normally encountered position. The...
Forum: Rumours & News
22nd Mar 2019, 07:27
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

There are several exhibits of this out in the...

There are several exhibits of this out in the market: 777, 787, and soon to come 777X. These models all have full FBW systems that enable the bare airframe to have aerodynamic characteristics that...
Forum: Rumours & News
20th Mar 2019, 20:30
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

VicMel - I really appreciate your thoughtful...

VicMel - I really appreciate your thoughtful response. I sense that overall you and I are on the same page. Please allow me to provide a few inputs on your points:

A i) The update in work by...
Forum: Rumours & News
20th Mar 2019, 01:11
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

capngrog - you are not picking nits, you caught a...

capngrog - you are not picking nits, you caught a mistake that I made. Thanks for pointing that out. I have corrected that entry. The jack screw is turned by the motor or cables and the nut...
Forum: Rumours & News
19th Mar 2019, 23:11
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Pilot trim via yoke mounted thumb switches stops...

Pilot trim via yoke mounted thumb switches stops MCAS stab command and runs stab in direction of pilot trim input. On the other hand, non-MCAS runaway stab may or may not continue to run if opposed...
Forum: Rumours & News
19th Mar 2019, 06:09
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

George - I hope you don't mind a few questions. ...

George - I hope you don't mind a few questions. I'd like to learn from your experience.

With stick shaker going was there an AOA fault?
What was found to be the source of the event you...
Forum: Rumours & News
19th Mar 2019, 05:59
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

jagema, In order to work out your scenario...

jagema,

In order to work out your scenario let's be specific about a few aspects of the proposed sequence:

1. Are we starting from takeoff with indicated AOA failed high?
2. What is the speed...
Forum: Rumours & News
18th Mar 2019, 23:15
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Keep trimming and if the system continuously...

Keep trimming and if the system continuously trims you nose down as you are accelerating know that is the opposite direction of STS and thus incorrect => shut the stabilizer down. First and foremost...
Forum: Rumours & News
18th Mar 2019, 21:43
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Let me give two examples: On 737 the maximum...

Let me give two examples:

On 737 the maximum elevator displacement with full column input is either full travel if the elevator actuators are physically capable of pushing the elevators hard...
Forum: Rumours & News
18th Mar 2019, 21:04
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

You are stretching my 737 knowledge! I have...

You are stretching my 737 knowledge! I have never read or heard anything definitive about whether or not horizontal tail control (either electric or manual via the trim wheel) would be stalled out...
Forum: Rumours & News
18th Mar 2019, 20:51
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

A couple of responses to your points: 1....

A couple of responses to your points:

1. True, but you don't truly get everything turned off until you use the stabilizer cutout switches. Handling qualities are not certifiable in that...
Forum: Rumours & News
18th Mar 2019, 20:39
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Great and peace. We just need to be careful in...

Great and peace. We just need to be careful in an MCAS focused discussion not to give the impression that the 737 MAX engine issue that gives rise to the need for MCAS is thrust pitch coupling. ...
Forum: Rumours & News
18th Mar 2019, 20:35
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Music to my engineer ears! Let me add that the...

Music to my engineer ears! Let me add that the 737 automatic stabilizer control should never drive your airplane away from trim if you are flying at a steady speed and an AOA well below stick...
Forum: Rumours & News
18th Mar 2019, 20:29
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Got it, thanks for expanding. What I was wanting...

Got it, thanks for expanding. What I was wanting to know was if you were pointing to an explicit command limit within the control system that would keep from asking more of the elevator actuators...
Forum: Rumours & News
18th Mar 2019, 20:08
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Need for MCAS is not related the thrust pitch...

Need for MCAS is not related the thrust pitch coupling. Read previous thread entries to understand and catch up with the discussion.
Forum: Rumours & News
18th Mar 2019, 19:59
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Depends on horizontal stabilizer position, AOA,...

Depends on horizontal stabilizer position, AOA, and airspeed. With stabilizer in trimed position elevator retains effective control through its full range of roughly +/-30 degrees up to about 250...
Forum: Rumours & News
18th Mar 2019, 19:50
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

That's what I suspect, but I want to have dozing...

That's what I suspect, but I want to have dozing expand on the question a bit before answering.
Forum: Rumours & News
18th Mar 2019, 19:42
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

Need you to describe what you mean by "Q...

Need you to describe what you mean by "Q limiter".
Forum: Rumours & News
18th Mar 2019, 19:40
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

This is a very large thread, but if you want to...

This is a very large thread, but if you want to know what is going on here you need to read from the beginning or at least skim through. Your question has been covered in numerous posts. You are...
Forum: Rumours & News
18th Mar 2019, 19:19
Replies: 5,109
Views: 13,436,576
Posted By FCeng84

I cannot speak to the potential for binding of...

I cannot speak to the potential for binding of the horizontal stabilizer control (either via electric motor or via manual turn of mechanical trim wheel) but I can shed some light on the first...
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