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Search: Posts Made By: Luc Lion
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1st Jun 2019, 14:14
Replies: 194
Views: 106,517
Posted By Luc Lion

Effectively, when a pilot discovers that he is...

Effectively, when a pilot discovers that he is unable to trim manually his airplane, he may be tempted to try in the opposite direction for checking if the system is mecanically blocked. I read a...
31st May 2019, 18:12
Replies: 194
Views: 106,517
Posted By Luc Lion

To this respect, the information transmitted by...

To this respect, the information transmitted by the interim report is :

So, the cutout switches have been switched off between 05:40:35 and 05:40:41,
Then later:

This can only indicate that...
28th May 2019, 14:05
Replies: 617
Views: 464,514
Posted By Luc Lion

FRogge, you then might find that the following...

FRogge, you then might find that the following runaway incident report is interesting.
It's a FBW airplane, of course.
Ultimately, the cause is linked to an incorrect safety risk assessment...
21st May 2019, 16:01
Replies: 185
Views: 126,903
Posted By Luc Lion

Just guessing here : I believe that the changes...

Just guessing here :
I believe that the changes to the wiring diagrams that resulted in having the column cutout switches (the ones hidden in the control columns) work effectively for autopilot and...
21st May 2019, 15:16
Replies: 185
Views: 126,903
Posted By Luc Lion

It must be less than 43 seconds, because this is...

It must be less than 43 seconds, because this is the elapsed time between MCAS activation and activation of the cutout switches in the ET302 case.
Possibly even less than 38 seconds as there is a 5...
Forum: Jet Blast
21st May 2019, 11:08
Replies: 15
Views: 5,687
Posted By Luc Lion

Academics are too busy for viewing mainstream...

Academics are too busy for viewing mainstream movies.
These ones have just discovered Die Hard 2 (1990)
19th May 2019, 13:17
Replies: 185
Views: 126,903
Posted By Luc Lion

MCAS runaway is worse than a classical runaway,...

MCAS runaway is worse than a classical runaway, not only because it is an intermittent runaway, but even more so because it is caused by a faulty AOA reading that also drives the Elevator Feel System...
19th May 2019, 09:39
Replies: 99
Views: 39,876
Posted By Luc Lion

There is no danger : the US has upgraded the...

There is no danger : the US has upgraded the Ticonderoga cruisers with 5 hand-held VHF radios per vessel.
17th May 2019, 18:48
Replies: 185
Views: 126,903
Posted By Luc Lion

I just meant that the NNC does NOT say "put the...

I just meant that the NNC does NOT say "put the airplane in trim before using the cutout switch".

I think that, without having been explained the importance and impact of each step, there is a...
17th May 2019, 16:23
Replies: 185
Views: 126,903
Posted By Luc Lion

Oggers, re-read parallely the abnormal...

Oggers,
re-read parallely the abnormal procedure AND the interim accident report.
You'll conclude that the pilots have followed the procedure until flipping the cutout switches.

And, in the...
17th May 2019, 11:34
Replies: 185
Views: 126,903
Posted By Luc Lion

That statement is wrong. There is nothing in...

That statement is wrong.
There is nothing in the FCOM nor in the QRH that instructs to use electric trim buttons to put the aircraft in trim prior to flip the cutout switches,
even though I reckon...
16th May 2019, 12:12
Replies: 185
Views: 126,903
Posted By Luc Lion

The comments quoted in the article appear rather...

The comments quoted in the article appear rather obscene knowing that they are voiced by people supposed to exercise responsibilities on behalf of millions other people.
Nowadays, it looks as though...
14th May 2019, 19:36
Replies: 24
Views: 16,154
Posted By Luc Lion

The delta-v speed acquired in low atmosphere is...

The delta-v speed acquired in low atmosphere is the most expensive in terms of fuel factor, mostly because of drag.
For most rockets, the dynamic pressure starts to decrease around 13 km of...
5th Apr 2019, 13:37
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

Sorry, confirmation bias ; I positively checked...

Sorry, confirmation bias ; I positively checked that it wasn't the flaps and then I misread another line for being the gear (was probably the AP).
So something was retracted, but it wasn't the flaps...
5th Apr 2019, 13:24
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

It was a great idea to have 2 cutout switches (up...

It was a great idea to have 2 cutout switches (up to the B737 NG) ; one acting on the yoke trim switches and the other acting on the autopilot and STS.
It was a not so great idea to replace them...
5th Apr 2019, 13:19
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

There are 2 typos in the report "History of...

There are 2 typos in the report "History of Flight"
So please read:
...
At 05:39:22 and about 1,000 feet the left autopilot (AP) was engaged (it disengaged about 33 seconds later), the GEAR was...
5th Apr 2019, 12:13
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

Not too important, but there are 2 typos in the...

Not too important, but there are 2 typos in the interim report which already misguided 2 pprune posters.
By comparing the report text with the DFDR diagram, it is obvious that these are typos.
They...
29th Mar 2019, 21:48
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

It transforms any angle alpha in (90° - alpha). ...

It transforms any angle alpha in (90° - alpha).
So 0° becomes 90°.
Not sure this is convenient...
29th Mar 2019, 15:37
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

VicMel, what you write does not match the FDR...

VicMel, what you write does not match the FDR data on AOA values that were shown in the interim report of the Lion Air accident.
It doesn't fit how SIN/COS resolvers work either.

There is a good...
29th Mar 2019, 13:04
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

VicMel, it looks as though, at least for the...

VicMel,
it looks as though, at least for the NG, the AOA sensor provides an analog output to both the ADIRU and the SMYD box.
I couldn't find a diagram of the ADIRU Analog interfaces, but here is...
18th Mar 2019, 13:17
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

I haven't seen it posted, apologies if it is a...

I haven't seen it posted, apologies if it is a duplicate:

From BEA | Bureau d'Enquêtes & d'Analyses (https://twitter.com/BEA_Aero), via Twitter

It states that the FDR data have been downloaded...
16th Mar 2019, 18:59
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

Yes, the EFS is present in the Max. And it is 4...

Yes, the EFS is present in the Max.
And it is 4 times the normal forces, in both models.
16th Mar 2019, 14:07
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

Hi Dave. It depends. My answer to your first...

Hi Dave. It depends.
My answer to your first question was:

∆p = (1029 – 1013.25) hPa * (1 - 0.0019812(°K/ft) * 7657 ft/288.15 °K)^5.2561
∆p = 11.85 hPa[/QUOTE]
So, physically, your question is...
15th Mar 2019, 17:07
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

CORRECTION: Do you mean that what Boeing calls a...

CORRECTION: Do you mean that what Boeing calls a "Elevator Feel Computer" is actually a mechanical computer ??? :bored::confused:

This is correct for the Elevator Feel Shift (EFS) module which...
15th Mar 2019, 15:57
Replies: 5,129
Views: 10,154,261
Posted By Luc Lion

What I find hard to understand is why Boeing...

What I find hard to understand is why Boeing didn't elect to upgrade the Elevator Feel System for compensating this undesired aerodynamic behaviour and instead created a new MCAS software module in...
Showing results 1 to 25 of 154
 


 
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