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Search: Posts Made By: wiedehopf
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Forum: Rumours & News
1st Dec 2018, 22:25
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Knowing you have an AoA problem means you might...

Knowing you have an AoA problem means you might more easily disregard a stick shaker when it doesn't make sense.
Also on takeoff roll crosschecking speeds AND AoA seems like a sensible idea.

I'm...
Forum: Rumours & News
29th Nov 2018, 21:13
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

People looking for the report a quicker download...

People looking for the report a quicker download is possible here:
Lion Air Boeing 737 MAX 8 crashed into Java Sea off Jakarta » JACDEC...
Forum: Rumours & News
28th Nov 2018, 11:36
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

The maintenance log from the new report seems...

The maintenance log from the new report seems interesting, so i'll just post it here as pictures....
Forum: Rumours & News
27th Nov 2018, 14:40
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

[/LIST] That's not true. Look at the FDR, it is...

[/LIST]
That's not true. Look at the FDR, it is quite clear MCAS operated on the previous flight.
They used the cutout and trim wheel:
...
Forum: Rumours & News
24th Nov 2018, 17:50
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

@gums The traces for manual trim only...

@gums


The traces for manual trim only show the manual inputs for the ELECTRIC trim via the switches on the yoke.

If you move the trim wheel manually it is only shown via the Trim position....
Forum: Rumours & News
23rd Nov 2018, 13:50
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

[/LIST]Actually as far as i know the AoA probe...

[/LIST]Actually as far as i know the AoA probe replacement was carried out not before the accident flight but prior to the previous flight.

I have not yet seen FDR data from the flights that...
Forum: Rumours & News
23rd Nov 2018, 12:36
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

It was previously written in this thread that the...

It was previously written in this thread that the AOA DISAGREE alert only exists when the PFDs are fitted with an AOA display.

Anyway Air Data disagree errors are most likely coupled to being in...
Forum: Rumours & News
22nd Nov 2018, 20:12
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Yes. But they also retracted the flaps after the...

Yes. But they also retracted the flaps after the stickshaker had already been going off for quite some time.

That's 2 activations of MCAS in the short interval the flaps were up. Then after that...
Forum: Rumours & News
22nd Nov 2018, 18:53
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

I took the freedom to add what i could read...

I took the freedom to add what i could read overlaid onto the slide of the FDR readout (in the hope that someone will find it useful):
(EDIT: improved annotations, used DaveReidUKs better picture as...
Forum: Rumours & News
22nd Nov 2018, 18:11
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

It does. The flap position is the light green...

It does.
The flap position is the light green graph 3rd or 4th from the bottom.

@climber134 would you mind posting the slide of the accident flight (your pictures are better quality than Lucs)
...
Forum: Rumours & News
22nd Nov 2018, 17:24
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

The picture you are describing seems to be from...

The picture you are describing seems to be from the previous flight.
(See on the x-axis written DPS and CGK would indicate a flight from Denpasar to Jakarta, the accident flight however departed...
Forum: Rumours & News
21st Nov 2018, 16:25
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

You missed the "(if engaged)" part of the...

You missed the "(if engaged)" part of the checklist item.
Even if it didn't say that checklists are not magically not applicable because you can't perform one of the items because it's already done....
Forum: Rumours & News
21st Nov 2018, 11:55
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

So you won't notice that you can't maintain level...

So you won't notice that you can't maintain level flight?
If you can't pull up because the yoke is too heavy you have to use the trim switches.
Or maybe you would not use the trim switches because...
Forum: Rumours & News
18th Nov 2018, 10:29
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

There can't be consensus in speculation. Read...

There can't be consensus in speculation.
Read the thread for that speculation.

Also i have neither authority nor detailed 737 knowledge but i have read the thread.

It probably won't be a...
Forum: Rumours & News
15th Nov 2018, 21:28
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

No one is talking STS anymore. Everyone is...

No one is talking STS anymore. Everyone is talking about MCAS.

The aggressive trim down due to AoA failure occurs only after the flaps are retracted. (MCAS)
Forum: Rumours & News
15th Nov 2018, 21:26
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

If i understood the description correctly just...

If i understood the description correctly just pulling would not stop the trim in the case of MCAS.
The stab trim switch would stop it and it would start again after 5 seconds.

They had been...
Forum: Rumours & News
14th Nov 2018, 19:33
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Check the video posted a few posts above. You...

Check the video posted a few posts above.
You can see the trim wheel in action. It can be turned by hand and even has a crank that is not used on the video (not sure why)
(This is the video in...
Forum: Rumours & News
10th Nov 2018, 18:38
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Looking at the altitude profile the accident and...

Looking at the altitude profile the accident and previous flight there is this sudden descent.
That fits with a high reading AoA sensor leading to stick shaker activation followed by a pitch down by...
Forum: Rumours & News
10th Nov 2018, 17:55
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

If you read the thread carefully you will come...

If you read the thread carefully you will come across this post:



Then there is also this comment.




The archive version of this forum can be searched a little bit better with CTRL-F
Forum: Rumours & News
10th Nov 2018, 10:43
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

See this press release from Boeing: ...

See this press release from Boeing:
https://boeing.mediaroom.com/news-releases-statements?item=130327
Excerpt:


So that sounds to me like they released the Bulletin due to recovered FDR data.
Forum: Rumours & News
7th Nov 2018, 19:03
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Direct link for larger picture:...

Direct link for larger picture: https://pbs.twimg.com/media/DrbMs-VVsAA9NgB.jpg:large
Bulletin in picture form on twitter:

https://twitter.com/theaircurrent/status/1060259878315278336
Forum: Rumours & News
7th Nov 2018, 15:26
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

So inhibiting the anti-stall trim system on AOA...

So inhibiting the anti-stall trim system on AOA or other air data disagree would seem like a sensible thing to do?

Can Boeing even do that now without being sued?
Forum: Rumours & News
7th Nov 2018, 09:13
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

From the Seattle Times article: Now i do...

From the Seattle Times article:


Now i do understand a malfunctioning AoA sensor sensing high AoA would make the red/black band come up on the speed tape (and activate the stick shaker)

But...
Forum: Rumours & News
30th Oct 2018, 19:51
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Sorry not to make it clear: I was talking the...

Sorry not to make it clear: I was talking the around +7000fpm value in the middle of the -9000fpm values.
With the timestamp uncertainty deriving the vertical rate from time and altitude would have...
Forum: Rumours & News
30th Oct 2018, 19:06
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Aircraft transmit vertical speed. Also looking...

Aircraft transmit vertical speed.
Also looking at the data points in question deriving it from altitude and time would not have yielded that rate.

Could very well be bad data. There is error...
Forum: Rumours & News
30th Oct 2018, 08:21
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

The speed increases significantly with the...

The speed increases significantly with the "altitude dip" which i would call a descent.
After that they climb at a higher rate because they are faster and are reducing speed, trading speed for...
Forum: Rumours & News
29th Oct 2018, 19:23
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

This is altitude plotted over distance traveled,...

This is altitude plotted over distance traveled, the graph includes the last 10 nautical miles of the flight data.
The distance vs altitude is drawn to scale.
...
Forum: Rumours & News
29th Oct 2018, 17:49
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

Please keep in mind that this is altitude plotted...

Please keep in mind that this is altitude plotted against time so you can't really tell the flight path from it.

If you believe the data the aircraft had a descent rate of 31000 ft per minute...
Forum: Rumours & News
29th Oct 2018, 16:12
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

So the prediction you are mentioning is only...

So the prediction you are mentioning is only implemented for displaying live flights, but it is used because quite a few people will look up and want the planes on map to match up.
Also i would not...
Forum: Rumours & News
29th Oct 2018, 08:01
Replies: 2,099
Views: 1,471,830
Posted By wiedehopf

A stall seems unlikely as they rather seemed to...

A stall seems unlikely as they rather seemed to be going quite fast. The data from FR24 are groundspeed data and that is of course influenced by wind too.
But still to stall at that altitude with a...
Showing results 1 to 30 of 30


 
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