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Search: Posts Made By: Luc Lion
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5th Jan 2022, 14:08
Replies: 118
Views: 22,596
Posted By Luc Lion

The problem with a single serie of tests is that...

The problem with a single serie of tests is that it will only be valid for the radar altimeter type installed in the testing aircraft, and for the same antenna fit.
The lack of radar altimeter...
4th Jan 2022, 11:23
Replies: 118
Views: 22,596
Posted By Luc Lion

I agree with you : mitigation measures ARE...

I agree with you : mitigation measures ARE possible
4th Jan 2022, 10:29
Replies: 118
Views: 22,596
Posted By Luc Lion

You are quite right for the cellular antennas...

You are quite right for the cellular antennas radiating lobes.
However, the reception cone for radar altimeter antennas is quite large : between 35° and 60° of cone aperture for the 3dB (half power)...
4th Jan 2022, 09:35
Replies: 118
Views: 22,596
Posted By Luc Lion

Thanks for the correction. Sorry, it was...

Thanks for the correction.
Sorry, it was hastily written.
The point I wanted to make was that there is quite probably ample room for balancing measures, like computing a safe distance between the...
3rd Jan 2022, 15:29
Replies: 118
Views: 22,596
Posted By Luc Lion

The RTCA document quoted above (and hereafter)...

The RTCA document quoted above (and hereafter) gives a good deal of contextual information and of explanation on how interferences can jeopardise radar altimeter operation.
However is does not give...
28th Nov 2021, 17:15
Replies: 14
Views: 8,684
Posted By Luc Lion

I am ready to bet that the difference mostly lays...

I am ready to bet that the difference mostly lays in the fact that the Bologna's aircraft had enough thrust left for making a go-around and another approach.
28th Nov 2021, 14:30
Replies: 14
Views: 8,684
Posted By Luc Lion

Reminiscent of the Ryanair bird-strike accident...

Reminiscent of the Ryanair bird-strike accident that happened at Roma Ciampino airport, on 10th November 2008.
The final report was published more than 10 year after (20/12/2018) and is available...
Forum: Tech Log
6th Apr 2020, 11:19
Replies: 35
Views: 18,726
Posted By Luc Lion

Thanks Dave. I forgot that most modern CPUs are...

Thanks Dave.
I forgot that most modern CPUs are clocked to give a reliable 1 microsecond interval.
That means that an interrupt coded to click every millisecond is actually triggered every 2^10...
Forum: Tech Log
4th Apr 2020, 17:08
Replies: 35
Views: 18,726
Posted By Luc Lion

It looks as though the guy who computed that used...

It looks as though the guy who computed that used a standard round rather than a round down for the day count calculation.
The correct value is:
2^32 ms = 49d 17h 2m 47s 296ms
Forum: Tech Log
4th Apr 2020, 16:42
Replies: 35
Views: 18,726
Posted By Luc Lion

I would bet that this issue is caused by an...

I would bet that this issue is caused by an incorrect garbage collection of disused packets in CCS.
I wonder is this is another bug from Wind River Systems (the company selling VxWorks) or if the...
14th Mar 2020, 10:29
Replies: 180
Views: 111,629
Posted By Luc Lion

Airsound, I don't think that this document has...

Airsound, I don't think that this document has any relevance to the consequences of UK leaving EASA.
And the only part that I can see as somewhat linked to pilots' worries if the chapter 3...
12th Mar 2020, 22:50
Replies: 180
Views: 111,629
Posted By Luc Lion

I am afraid you are mostly wrong. The...

I am afraid you are mostly wrong.

The purpose of the withdrawal agreement is to safeguard some interests deemed critical by one or the other of the 2 parties, using a "grand-fathering" approach....
12th Mar 2020, 21:04
Replies: 180
Views: 111,629
Posted By Luc Lion

The deal in question is the Brexit withdrawal...

The deal in question is the Brexit withdrawal agreement which was signed on January 24th 2020 and became effective on February 1st 2020.
It's kind of history now. ;-)
21st Feb 2020, 11:35
Replies: 120
Views: 95,626
Posted By Luc Lion

Most F-18 pilots whose first instinct would be to...

Most F-18 pilots whose first instinct would be to shoot down the 767 have now retired after multiple ejections.
They had to eject after shooting down the KC46 that was coming to refuel their fighter...
18th Feb 2020, 20:25
Replies: 378
Views: 172,252
Posted By Luc Lion

Thanks. I stand corrected.

Thanks.
I stand corrected.
18th Feb 2020, 19:50
Replies: 378
Views: 172,252
Posted By Luc Lion

No. I am a bit too lazy to look for the...

No.

I am a bit too lazy to look for the link to the wiring diagram, but I remember that the cut-off switches remove power from the whole system early in the diagram and undoubtedly before the...
18th Feb 2020, 12:02
Replies: 378
Views: 172,252
Posted By Luc Lion

if I am not mistaken, in one of the multiple...

if I am not mistaken, in one of the multiple previous MCAS threads, a Boeing engineer has explained that MCAS had been designed to comply with 14 CFR Part 25.175....
Forum: Tech Log
23rd Jan 2020, 15:11
Replies: 18
Views: 2,592
Posted By Luc Lion

No. An IFR flight making a visual approach on...

No.
An IFR flight making a visual approach on an airport with IFR approaches remains IFR.
In case the approach is interrupted, the crew has to make a climbing turn and join the missed approach...
Forum: Tech Log
23rd Jan 2020, 11:42
Replies: 18
Views: 2,592
Posted By Luc Lion

Never heard of "contact approach" in Europe. ...

Never heard of "contact approach" in Europe.
Visual approach, of course yes. And, as in the US, it is at the request of the crew only.
Forum: Tech Log
21st Jan 2020, 17:59
Replies: 60
Views: 22,830
Posted By Luc Lion

FrequentSLF please see here for interrupt...

FrequentSLF please see here for interrupt support in ADA.
https://www.adaic.org/resources/add_content/standards/12rm/html/RM-C-3.html
Forum: Tech Log
21st Jan 2020, 16:10
Replies: 60
Views: 22,830
Posted By Luc Lion

I believe that the B737 FCC software is written...

I believe that the B737 FCC software is written in ADA.
I am not 100% certain of it, but I know that the FCC of the Classic serie (300, 400, 500) was written in ADA, that the FMS of nowadays B737...
21st Jan 2020, 13:33
Replies: 683
Views: 1,650,367
Posted By Luc Lion

There is a new preliminary report available on...

There is a new preliminary report available on the Iranian CAA site : https://www.cao.ir/web/english/investigation-reports
The document is here : ...
7th Jan 2020, 13:10
Replies: 64
Views: 42,706
Posted By Luc Lion

Yes it does, it(The A350) has copper sandwiches...

Yes it does, it(The A350) has copper sandwiches embedded in the CRP wing.[/QUOTE]
Yet, Airbus also finds that it is very difficult to prove that lightning related ignition sources in fuel tanks are...
3rd Dec 2019, 11:55
Replies: 59
Views: 74,326
Posted By Luc Lion

According to Pilatus, the PC-12 can have a 10+1...

According to Pilatus, the PC-12 can have a 10+1 seating configuration.
https://www.pilatus-aircraft.com/en/fly/pc-12
If it was the configuration of the accident airplane, it still means that an...
6th Aug 2019, 23:04
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

(my emphasis) About the bit selection ; 1...

(my emphasis)

About the bit selection ; 1 bit for MCAS status "engaged" (disabling the control column switches), 1 bit for nose down pitch trim command, and 3 bits for undetailed "complications"...
6th Aug 2019, 12:29
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

If you re-read the Seattle Times article, you'll...

If you re-read the Seattle Times article, you'll notice that it is only 2 bits flipping that are required for enacting the scenario.
Five bits have been actually flipped because this is the standard...
5th Aug 2019, 12:48
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

Yes, cosmic rays can produce multiple soft...

Yes, cosmic rays can produce multiple soft errors.
These are more prevalent with secondary cosmic rays that are neutrons and with higher altitude.
Theoretically, they could also be produced by a...
2nd Jul 2019, 16:25
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

Dave, I am ready to bet that the captain question...

Dave, I am ready to bet that the captain question came after he unsuccessfully tried to operate his trim thumb switches and that he actually asked the FO to check if the switches on his side were...
2nd Jul 2019, 10:51
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

Here it is: ...

Here it is:
http://www.ecaa.gov.et/documents/20435/0/Preliminary+Report+B737-800MAX+,(ET-AVJ).pdf

So it is a bit more than 1 minute after the cutout switches had been actioned.

Luc
2nd Jul 2019, 06:42
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

Your assumption is confirmed by the ET302 interim...

Your assumption is confirmed by the ET302 interim report.
The CVR indicates that the FO tried to action the trim via his trim thumb switches after having flipped the pedestal cutout switches.
None...
2nd Jul 2019, 06:06
Replies: 63
Views: 48,292
Posted By Luc Lion

4runner, I am not a professional pilot. And I am...

4runner, I am not a professional pilot. And I am surprised that you can't recognise sarcasm when I suggest that pilot stupidness is a possible explanation for that category of accidents.
1st Jul 2019, 22:42
Replies: 4,656
Views: 4,487,187
Posted By Luc Lion

I read a description where each of the 2...

I read a description where each of the 2 processors care for a specific subset of the 15 (or so) FCC processes. It is only in case a fault is detected that the valid processor take over all the...
1st Jul 2019, 22:28
Replies: 30
Views: 21,475
Posted By Luc Lion

Thank you for that pinch of humour. Just...

Thank you for that pinch of humour.
Just wondering what is that place where databases don't crash.

I believe the 3 major sins of software engineers (or whatever you want to call them) are:
- not...
1st Jul 2019, 21:27
Replies: 63
Views: 48,292
Posted By Luc Lion

Why would I try to convince tabloids or general...

Why would I try to convince tabloids or general public audience?
I am an IT engineer and a pilot.
I share with other pilots what I think is a reasonable guess.
If educated journalists want to read...
1st Jul 2019, 19:21
Replies: 63
Views: 48,292
Posted By Luc Lion

Only guessing here. But when details will be...

Only guessing here.
But when details will be available, I wouldn't be surprised if the test scenario is something like:
- create a set of events prone to overload the CPU1 of the active FCC
-...
Showing results 1 to 35 of 189
 


 
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