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Search: Posts Made By: rudderrudderrat
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Forum: Tech Log
23rd Feb 2014, 10:06
Replies: 813
Views: 153,892
Posted By rudderrudderrat

It's a bit like the Costa Concordia (Costa...

It's a bit like the Costa Concordia (Costa Concordia disaster - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Costa_Concordia_disaster)) crew saying, "If only we had turned 50 feet...
Forum: Tech Log
25th Jan 2014, 15:37
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi Chris, Thanks for the correction. In...

Hi Chris,

Thanks for the correction.
In which case, Capt. Asseline didn't select TOGA until sometime after 328 and before 330.
That was only 4 to 6 seconds before impact with the tree tops,...
Forum: Tech Log
25th Jan 2014, 14:08
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi DW, If you select TOGA, you should get...

Hi DW,

If you select TOGA, you should get TOGA power irrespective of whether the A/T is engaged or not.
It appears to me, that had he maintained the TLs in the TOGA position, then he would have...
Forum: Tech Log
25th Jan 2014, 13:25
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi DW, If we all agree on the end of...

Hi DW,


If we all agree on the end of recording (impact) at time 339 seconds, then is there any point about discussing when the recording started?

If you look at data on TOME 4, at time 240...
Forum: Tech Log
21st Jan 2014, 08:07
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi Chris Scott, Sorry for the delay in finding...

Hi Chris Scott,
Sorry for the delay in finding this info.

You and Owain are correct. Please see http://sfte2013.com/files/78988645.pdf, slide 35

"Test Conduct - Stalls for certification
in...
Forum: Tech Log
7th Jan 2014, 18:32
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi Chris, I can't find a document to support...

Hi Chris,

I can't find a document to support it, except on page 17 of http://lessonslearned.faa.gov/IndianAir605/A320%20Final%20Special%20Condition.pdf
"Several commenters note that the new VS1...
Forum: Tech Log
6th Jan 2014, 09:11
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi HazelNuts39, The behaviour of Alpha Max...

Hi HazelNuts39,

The behaviour of Alpha Max protection demonstrated in the video around time 10:50 shows an AoA of between 16° (me) to 17° (CONF iture) which is very close to the theoretical Alpha...
Forum: Tech Log
5th Jan 2014, 19:05
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi CONF iture, It simply does this rather...

Hi CONF iture,

It simply does this rather well. No promise of achieving aMax - only of not exceeding it.
FCOM 27-20-10 Protections.
"HIGH ANGLE OF ATTACK PROTECTION

Under normal law, when the...
Forum: Tech Log
5th Jan 2014, 14:18
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi CONF iture, The video also shows (at time...

Hi CONF iture,

The video also shows (at time 10:50 ish) an AoA of 16° after rolling on about 15° of bank. I would guess from that demo that Alpha Max is >15°, but the system remains on the...
Forum: Tech Log
4th Jan 2014, 13:57
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi HazelNuts39, A conventional aircraft...

Hi HazelNuts39,

A conventional aircraft stall speed is demonstrated by trimming the stab only as far as Vref, then decelerating at 1 kt/sec whilst applying back elevator until the nose drop. It...
Forum: Tech Log
4th Jan 2014, 10:57
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi Chris, Vs1g was demonstrated in flight...

Hi Chris,

Vs1g was demonstrated in flight test in ALT LAW.
It was demonstrated at 1g, whereas in a conventional aircraft, there is a tendency for the nose to drop and the demonstrated value is...
Forum: Tech Log
4th Jan 2014, 10:01
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi HazelNuts39, OEI - SRS commands V2, but...

Hi HazelNuts39,

OEI - SRS commands V2, but aFloor is disabled so there is no problem.

Correct.
That is why I've only considered "straight line graph between afloor and aMax" (see post #211...
Forum: Tech Log
4th Jan 2014, 08:56
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi HazelNuts39, Well spotted! FCOM,...

Hi HazelNuts39,

Well spotted!

FCOM, Aircraft Systems, DSC-27-20-10, Protections:
"At Take off aProt is equal to aMAX for 5s."
By which time, the SRS will have commanded about V2+10.
During...
Forum: Tech Log
3rd Jan 2014, 22:52
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi CONF iture, Maybe the system can rapidly...

Hi CONF iture,

Maybe the system can rapidly achieve aMax during +ve delta g, because it is able to avoid exceeding aMax by simply reducing the rate of rotation.
Whereas at Habsheim, there was...
Forum: Tech Log
3rd Jan 2014, 08:58
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi Chris, I agree. It exceeds 15...

Hi Chris,

I agree. It exceeds 15 momentarilly when he rolls on some bank.
During the steady turn, the AoA gauge then returns to 15 and when he levels the wings again, the AoA shows less than 15....
Forum: Tech Log
2nd Jan 2014, 12:45
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi CONF iture, Please have a look at...

Hi CONF iture,


Please have a look at Airbus A320 Fly By Wire Demo - YouTube (http://www.youtube.com/watch?v=9fqy8uPzW90&feature=youtu.be) from time 12:00. (link posted by alonso1986 in another...
Forum: Tech Log
31st Dec 2013, 09:50
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi CONF iture, I agree. However Alpha Max...

Hi CONF iture,
I agree.
However Alpha Max is approached asymptotically and with full back stick will require some time before it is achieved.
Are you really suggesting that despite the Alpha...
Forum: Tech Log
26th Dec 2013, 16:16
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi AlphaZuluRomeo, I think the B777 FBW...

Hi AlphaZuluRomeo,

I think the B777 FBW system would satisfy CONF iture. Page 3. Design Philosophy. http://www.davi.ws/avionics/TheAvionicsHandbook_Cap_11.pdf

"What should be noted, however, is...
Forum: Tech Log
26th Dec 2013, 09:10
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi CONF iture, It is and has been since 2001...

Hi CONF iture,

It is and has been since 2001 after several heavy landing incidents. See:
Accident of an Iberian Airbus A320 in Bilbao...
Forum: Tech Log
22nd Dec 2013, 07:52
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi roulishollandais, They didn't know exactly...

Hi roulishollandais,
They didn't know exactly how it works, because FCOM is not that detailed. However, the system did exactly as it says on the tin - by preventing a stall.
I don't know how close...
Forum: Tech Log
21st Dec 2013, 08:36
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi C_Star, My calculation was for 100%...

Hi C_Star,

My calculation was for 100% efficient energy swap, which is reasonably close to what an aircraft could do on the front side of the drag curve when thrust> drag with a speed reduction.
...
Forum: Tech Log
18th Dec 2013, 09:55
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi Owain Glyndwr, I don't quite understand...

Hi Owain Glyndwr,

I don't quite understand that statement.

If we consider the conversion of kinetic energy to potential energy from say 112 kts (achieved) to 107 kts (a guess of flying possibly...
Forum: Tech Log
16th Dec 2013, 10:59
Replies: 813
Views: 153,892
Posted By rudderrudderrat

vilas From page 40 of the BEA report, at...

vilas

From page 40 of the BEA report, at time 1245
100 RA Speed 151 kts.
48 RA Speed 141 kts.
40 RA Speed 137 kts.
30 RA Speed 116 kts.

It appears to me that the aircraft was...
Forum: Tech Log
16th Dec 2013, 08:35
Replies: 813
Views: 153,892
Posted By rudderrudderrat

vilas We don't need to discuss that -...

vilas

We don't need to discuss that - because as Clandestino points out, "Alpha Floor is available, when the flight controls are in Normal Law, from lift off to 100 ft RA at landing." (FCTM)
...
Forum: Tech Log
14th Dec 2013, 09:54
Replies: 813
Views: 153,892
Posted By rudderrudderrat

villas The French report, page 35: 12h 46'...

villas

The French report, page 35:
12h 46' 26'' CDB "Bon Je vais bien la debrayer l'auto-manette." (Google translate = "Good I'm fine to disengage the auto-throttle"). Radio Altimeter shows 40 /...
Forum: Tech Log
13th Dec 2013, 11:44
Replies: 813
Views: 153,892
Posted By rudderrudderrat

vilas From the link to the accident report I...

vilas

From the link to the accident report I posted yesterday:
"The first officer informed the captain that the aircraft was reaching 100 feet at 14:45:14. The descent continued to 50 feet 8...
Forum: Tech Log
12th Dec 2013, 17:22
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi DW, I agree with you there. The...

Hi DW,

I agree with you there.
The baulked landing procedure (Select TOGA power and rotate to 10 degs pitch) allows you to fly away from any attempted landing - even after touch down.

Some...
Forum: Tech Log
12th Dec 2013, 13:27
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi, Would it not be easier if you all read the...

Hi,
Would it not be easier if you all read the accident report?

Page 17 http://www.bea.aero/docspa/1988/f-kc880626/pdf/f-kc880626.pdf or,
ASN Aircraft accident Airbus A320-111 F-GFKC...
Forum: Tech Log
12th Dec 2013, 11:59
Replies: 813
Views: 153,892
Posted By rudderrudderrat

Hi HazelNuts39, Are you are confusing 30'? ...

Hi HazelNuts39,

Are you are confusing 30'?

"The flight mode changes to flare mode when the aircraft passes ​50 ft RA as it descends to land.
The system memorizes the attitude at ​50 ft, and...
Showing results 1 to 29 of 29


 
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