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13th Oct 2019, 09:32
Replies: 3,118
Views: 2,740,724
Posted By spornrad

search for 737 trim incidents

Peter Lemme has an article containing a long list of earlier 737 trim incidents, most on pre-MAX types. Doesn't seem to find earlier MCAS type failures....
12th Oct 2019, 16:42
Replies: 3,118
Views: 2,740,724
Posted By spornrad

[/LEFT] That means in my view: If...

[/LEFT]


That means in my view: If STS/MCAS/FCC is required for envelope protection, the present dual channel design is in no way sufficient/acceptable. Whether the MAX can be possibly...
12th Oct 2019, 12:16
Replies: 3,118
Views: 2,740,724
Posted By spornrad

Bombshell in JATR report?

Finding F3.5-C The JATR team considers that the STS/MCAS and EFS functions could be considered as stall identification systems or stall protection systems, depending on the natural (unaugmented)...
23rd Apr 2019, 13:48
Replies: 5,127
Views: 10,278,459
Posted By spornrad

It is just a magnified screen shot from the...

It is just a magnified screen shot from the prelim. report of the Lionair crash

Reason I posted this is the weird question of the ET captain to the FO to help him with the electric, manual trim,...
16th Apr 2019, 11:08
Replies: 5,127
Views: 10,278,459
Posted By spornrad

Nope. There is a clear temporary loss of input in...

Nope. There is a clear temporary loss of input in many of the manual, but none of the automatic commands. The latter show only "ragged" flanks....
15th Apr 2019, 11:21
Replies: 5,127
Views: 10,278,459
Posted By spornrad

If you look closely at the FDR traces, the...

If you look closely at the FDR traces, the Lionair captain who faithfully trimmed back up umpteen times did loose the trim switch ever now and then. There are off-blips in almost every long nose-up...
11th Apr 2019, 18:50
Replies: 5,127
Views: 10,278,459
Posted By spornrad

https://www.bloomberg.com/news/articles/2019-04-11...

https://www.bloomberg.com/news/articles/2019-04-11/sensors-linked-to-737-crashes-vulnerable-to-failure-data-showA review of public databases by Bloomberg News reveals the potential hazards of relying...
10th Apr 2019, 20:43
Replies: 5,127
Views: 10,278,459
Posted By spornrad

hope it was the old version: ...

hope it was the old version:
https://cimg8.ibsrv.net/gimg/pprune.org-vbulletin/720x699/max_sim_229b4bada3516060ed46b9f662622d3f0227d37b.jpg
9th Apr 2019, 08:05
Replies: 5,127
Views: 10,278,459
Posted By spornrad

Wise words. Seems to me that the entire concept...

Wise words. Seems to me that the entire concept of "artificial feel" and "artificial buffet" (AKA stickshaker) was envisioned many decades ago assuming pilots had stick and rudder skills ingrained...
7th Apr 2019, 08:44
Replies: 5,127
Views: 10,278,459
Posted By spornrad

Thanks for your explanations. Since it would be...

Thanks for your explanations. Since it would be another lottery win the thumb switch going south at that exact instance (besides why less, not no stab movement): Is there any remote possibility that...
7th Apr 2019, 07:48
Replies: 5,127
Views: 10,278,459
Posted By spornrad

Nope. Look at the FO trim up input (long one)...

Nope. Look at the FO trim up input (long one) that stops MCAS. First 3 s of that input moves the stab appr. 1 U up. Even at the lousy resolution of the plot you can see the difference. I copy/pasted...
6th Apr 2019, 22:13
Replies: 5,127
Views: 10,278,459
Posted By spornrad

Broken Thumbswitch?

Before the MCAS input the PF trims up twice with the thumb switch for appr. 3 s each. This results in appr 1 U uptrim stab movement, twice.
At 5:40:15 after the first MCAS ND he trims again up for...
5th Apr 2019, 09:44
Replies: 5,127
Views: 10,278,459
Posted By spornrad

In the prelim. report is a clear statement by the...

In the prelim. report is a clear statement by the FO that the manual trim attempt did not work as advertised in the AD.
There is also a subtle hint that probably shows why the pilots in a last...
2nd Apr 2019, 21:48
Replies: 908
Views: 944,086
Posted By spornrad

@ FDR, thanks for a lot of sound information. ...

@ FDR, thanks for a lot of sound information.
Two remarks:
First puzzle, MCAS authority was originally planned for 0.6° and after flight test blown up to a wopping 2.5° per input, which represents...
30th Mar 2019, 22:50
Replies: 32
Views: 30,251
Posted By spornrad

Rick Ludtke, a former Boeing engineer who worked...

Rick Ludtke, a former Boeing engineer who worked on designing the interfaces on the MAX’s flight deck, said managers mandated that any differences from the previous 737 had to be small enough that...
30th Mar 2019, 22:18
Replies: 32
Views: 30,251
Posted By spornrad

On March 27, 2019, the Wall Street Journal cited...

On March 27, 2019, the Wall Street Journal cited Rick Ludtke, a former Boeing engineer, that midlevel managers told their staff members Boeing had committed to paying Southwest Airlines -- which has...
Forum: Tech Log
29th May 2011, 12:06
Replies: 3,435
Views: 1,347,804
Posted By spornrad

Ask21, good thoughts, especially about the...

Ask21,
good thoughts, especially about the trim effect on aoa of the stab. I fly only small planes, but I guess the report is simply not providing enough information for a sound judgement.
I...
Forum: Tech Log
29th May 2011, 09:11
Replies: 3,435
Views: 1,347,804
Posted By spornrad

1. This crew got killed in their frantic struggle...

1. This crew got killed in their frantic struggle with an erroneous system. There are flaws in the system that prevented them from correctly recognizing the situation.
Air France Pilots Were...
8th Nov 2010, 21:08
Replies: 1,964
Views: 1,104,732
Posted By spornrad

Question RR Statement

Trent 900 statement - Rolls-Royce (http://www.rolls-royce.com/civil/news/2010/101108_trent_900_statement.jsp)


They do not claim there was no uncontained engine failure since 1994 with RR...
4th Nov 2010, 18:31
Replies: 1,964
Views: 1,104,732
Posted By spornrad

EASA AD on Trent 900

EASA AD No.: 2010-0008R1 on Trent 900:
http://ad.easa.europa.eu/blob/easa_ad_2010_0008R1.pdf/AD_2010-0008R1_2
19th Apr 2010, 21:31
Replies: 3,110
Views: 1,374,130
Posted By spornrad

Data collected over Germany by DLR flight

The German center for air and space travel (DLR) accomplished a successful measuring flight on 19 April 2010 over Germany. After a flight time of more than three hours the Falcon returned to its...
19th Apr 2010, 17:51
Replies: 3,110
Views: 1,374,130
Posted By spornrad

Switzerland LIDAR and balloon data

ETH Zuerich performed LIDAR and special aerosol-detecting balloon measurements:
http://www.ethlife.ethz.ch/archive_articles/100419_Aerosolmessungen_tl/100419_Lidar_Messung_l3.jpg?hires...
Forum: Tech Log
6th Jul 2009, 10:12
Replies: 4,594
Views: 2,810,092
Posted By spornrad

Speculation about human remains offensive

Speculation about human remains and autopsy results are at least inappropriate if not outright offensive, given this is a public forum that may well be seached e.g. by relatives of the deceased.
...
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