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Search: Posts Made By: Gysbreght
Showing results 1 to 35 of 144
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Forum: Rumours & News
3rd Mar 2019, 18:24
Replies: 48
Views: 29,184
Posted By Gysbreght

:ok: You've got it

:ok:

You've got it
Forum: Rumours & News
3rd Mar 2019, 15:45
Replies: 48
Views: 29,184
Posted By Gysbreght

The impact forces are primarily a function of the...

The impact forces are primarily a function of the rate of descent at touchdown. With unlimited runway length the flight speed is far less important. More important is the optimum pitch attitude,...
Forum: Rumours & News
3rd Dec 2018, 12:35
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

It may be impossible to maintain the airplane in...

It may be impossible to maintain the airplane in a stalled condition with the MCAS operating, without manual trim inputs.
Forum: Rumours & News
3rd Dec 2018, 12:19
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

Apparently the 737 MAX (without MCAS) does not...

Apparently the 737 MAX (without MCAS) does not have acceptable pitch characteristics with flaps UP at airspeeds approaching the stall. Therefore ...

MCAS (Maneuvering Characteristics Augmentation...
Forum: Rumours & News
14th Nov 2018, 11:42
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

Originally posted by AO283: "As a...

Originally posted by AO283: "As a designer/manufacturer, WHATEVER you run into, you don't want to 'break the Type Certificate'. Breaking the TC is not only very costly but will also cause substantial...
Forum: Rumours & News
14th Nov 2018, 08:55
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

Fuselage contributing to lift The wing lift...

Fuselage contributing to lift

The wing lift is associated with drag, called lift-dependent drag or 'induced' drag. It is a function of the wing aspect ratio and the spanwise lift distribution. To...
Forum: Rumours & News
13th Nov 2018, 13:43
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

Agreed, except that perhaps the authority of the...

Agreed, except that perhaps the authority of the MCAS should be limited if only one of the two AoA systems outputs a high value.
Forum: Rumours & News
11th Nov 2018, 10:57
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

The function of the system somewhat...

The function of the system somewhat euphemistically named MCAS (Maneuvering Characteristics Augmentation System) is similar to that of a stickpusher. Apparently the airplane needs it to comply with...
Forum: Rumours & News
10th Nov 2018, 17:28
Replies: 2,099
Views: 1,466,180
Posted By Gysbreght

According to the FAA Emergency AD, an erroneous...

According to the FAA Emergency AD, an erroneous Angle of Attack (AOA) input, among other symptoms, can result in indications of:
•
IAS DISAGREE alert.
•
ALT DISAGREE alert.

I'm wondering why...
Forum: Tech Log
25th Jan 2018, 11:18
Replies: 21
Views: 6,542
Posted By Gysbreght

scifi: "The nearest guess that I have made is...

scifi: "The nearest guess that I have made is that it is the 4th root of 3."

Correct, it is the 4th root of 3.
Forum: Tech Log
25th Jan 2018, 08:24
Replies: 21
Views: 6,542
Posted By Gysbreght

The factor 1.32 applies if the thrust is constant...

The factor 1.32 applies if the thrust is constant and the drag polar is 'parabolic'. A parabolic drag polar can be written as:
CD = a + b*CL^2
where a and b are constants, CD=drag coefficient and...
Forum: Tech Log
1st Apr 2016, 08:50
Replies: 18
Views: 3,051
Posted By Gysbreght

OTOH, a natural pitch-down that may be present at...

OTOH, a natural pitch-down that may be present at low altitude, is usually absent at high altitude.

Also the stall itself (maximum lift, loss of controllability) occurs "earlier", at a lower angle...
Forum: Tech Log
31st Mar 2016, 21:53
Replies: 18
Views: 3,051
Posted By Gysbreght

Gentlemen, The original question was: ...

Gentlemen,

The original question was:

"Are transport category aircraft stalled at high altitudes in certification testing?"
Forum: Tech Log
31st Mar 2016, 20:34
Replies: 18
Views: 3,051
Posted By Gysbreght

On the first question: FAA Advisory Circular...

On the first question:

FAA Advisory Circular 25-7C Flight Test Guide For Certification Of Transport Category Airplanes states:



On the second question: Yes, compressibility definitely...
Forum: Tech Log
21st Mar 2016, 11:07
Replies: 2
Views: 2,427
Posted By Gysbreght

This is different above 20,000 ft: ...

This is different above 20,000 ft:



This is wrong in your conception:



The Mach effects are not limited to the airspeed indication. The speed at which the buffet starts (buffet onset) at...
Forum: Rumours & News
5th Feb 2016, 19:06
Replies: 152
Views: 132,423
Posted By Gysbreght

The steep approach angle and high rate of descent...

The steep approach angle and high rate of descent requires an increased steady approach speed to permit a flare to zero rate of descent, because the speed bleeds off rapidly in the flare. You are not...
Forum: Rumours & News
5th Feb 2016, 16:03
Replies: 152
Views: 132,423
Posted By Gysbreght

True, there is a procedure for double engine...

True, there is a procedure for double engine flameout, and there is a procedure for ditching. But there is no procedure that emphasises the particular difficulty of ditching with both engines flamed...
Forum: Tech Log
4th Feb 2016, 20:55
Replies: 22
Views: 10,079
Posted By Gysbreght

Reader tdracer is correct. The certification...

Reader tdracer is correct. The certification performance requirement (current version) is:
Forum: Rumours & News
4th Dec 2015, 16:37
Replies: 918
Views: 1,117,871
Posted By Gysbreght

MG23: Have you considered the evidence that...

MG23:
Have you considered the evidence that nothing has been found within 15 NM of the 7th arc, and no more than a single flaperon has washed up on any shore?
Forum: Rumours & News
4th Dec 2015, 15:21
Replies: 918
Views: 1,117,871
Posted By Gysbreght

MG23: No one actually knows the seastate at...

MG23:

No one actually knows the seastate at the time and place flight MH370 ended. I didn't imply that a controlled ditching was easy or likely to be successful. There is also nothing to suggest...
Forum: Rumours & News
4th Dec 2015, 13:08
Replies: 918
Views: 1,117,871
Posted By Gysbreght

beamender99: The statement in the ATSB report...

beamender99: The statement in the ATSB report about controlled ditching reads as follows:

That is mostly rubbish. Engine thrust is not required to properly control the direction and vertical speed...
Forum: Rumours & News
2nd Dec 2015, 14:19
Replies: 3,923
Views: 4,444,300
Posted By Gysbreght

On the airbus, stall warning is only encountered...

On the airbus, stall warning is only encountered in alternate law, i.e. when the systems are already degraded by multiple failures. So stall warning is always preceded by other, unrelated, warnings...
Forum: Rumours & News
2nd Dec 2015, 13:17
Replies: 3,923
Views: 4,444,300
Posted By Gysbreght

The aural stall warning is evidently ineffective....

The aural stall warning is evidently ineffective. Would it be difficult to attach a shaker to the sidestick?
Forum: Rumours & News
29th Nov 2015, 14:55
Replies: 918
Views: 1,117,871
Posted By Gysbreght

That picture (Exhibit 21) is not particularly...

That picture (Exhibit 21) is not particularly accurate. Exhibit 1 shows that the rear spar is at approximately 60% of the flaperon chord, so about 40% of the bottom area is missing.
...
Forum: Tech Log
12th Sep 2015, 20:39
Replies: 4
Views: 4,844
Posted By Gysbreght

Checkboard: Your explanation is mostly correct,...

Checkboard:
Your explanation is mostly correct, but this part is not. At given weight, altitude and Machnumber Specific Air Range and thrust-specific fuel consumption (tsfc) do not change with...
Forum: Tech Log
7th Sep 2015, 17:45
Replies: 18
Views: 4,096
Posted By Gysbreght

Google is your friend: contingency noun...

Google is your friend:

contingency

noun possibility (http://www.thefreedictionary.com/possibility), happening (http://www.thefreedictionary.com/happening), chance...
Forum: Rumours & News
3rd Sep 2015, 17:48
Replies: 918
Views: 1,117,871
Posted By Gysbreght

On the subject of how the flaperon may have...

On the subject of how the flaperon may have become detached, I wonder if someone on this forum may be able to answer the question below.

When both engines and the APU are not operating, the ram...
Forum: Tech Log
30th Aug 2015, 09:34
Replies: 24
Views: 5,841
Posted By Gysbreght

Of course JT and wiggy have it right. The thrust...

Of course JT and wiggy have it right. The thrust contribution to lift is greatest at high AoA. Flap retraction has nothing to do with the lost of thrust component, but does of course affect the lift....
Forum: Rumours & News
28th Aug 2015, 19:23
Replies: 918
Views: 1,117,871
Posted By Gysbreght

172driver: Well, if you want to teach the...

172driver:

Well, if you want to teach the readers of this forum "correct French", that's fine with me. I thought it was more relevant that the investigators are looking at detachable parts that...
Forum: Rumours & News
27th Aug 2015, 18:37
Replies: 918
Views: 1,117,871
Posted By Gysbreght

172driver: Are you adding anything to what I...

172driver:
Are you adding anything to what I wrote?
There are several brackets bolted on that can be disassembled and exchanged for a "spare part".

(Deleted the rest since similar comments have...
Forum: Rumours & News
27th Aug 2015, 09:57
Replies: 918
Views: 1,117,871
Posted By Gysbreght

The Le Monde article mentions "pièces détachées...

The Le Monde article mentions "pièces détachées numérotées" which I interpret as parts that can be removed and replaced, and have a serial number.
Forum: Rumours & News
24th Aug 2015, 11:04
Replies: 918
Views: 1,117,871
Posted By Gysbreght

Just about anybody living in Toulouse is an...

Just about anybody living in Toulouse is an "aeronautical expert" in the eyes of the reporter of a local newspaper. The article doesn't say that the individual has any connection to the investigation...
Forum: Rumours & News
24th Aug 2015, 10:11
Replies: 918
Views: 1,117,871
Posted By Gysbreght

WingNut60: The aircraft was in final approach,...

WingNut60:
The aircraft was in final approach, initiated a go-around at 20 ft height - too late. It hit the water in a slight nose-down attitude at a vertical speed of about 1000 ft/min. The...
Forum: Rumours & News
23rd Aug 2015, 21:08
Replies: 918
Views: 1,117,871
Posted By Gysbreght

Hi Chris: Welcome to the discussion and...

Hi Chris:

Welcome to the discussion and thank you for your as usual well-informed contribution. Of course I am well aware of the fact that the landing speed in a flapless landing is much higher...
Forum: Rumours & News
23rd Aug 2015, 17:05
Replies: 918
Views: 1,117,871
Posted By Gysbreght

I agree that a "Sully ditching" requires a...

I agree that a "Sully ditching" requires a conscious pilot and a benign seastate. Furthermore, that pilot must be able to think beyond normal procedures and to anticipate what is required for a...
Showing results 1 to 35 of 144
 
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