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Search: Posts Made By: TyroPicard
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Forum: Tech Log
16th Nov 2010, 09:35
Replies: 1,524
Views: 743,002
Posted By TyroPicard

CONF I think you are an engineer? Therefore you...

CONF
I think you are an engineer? Therefore you see a technical problem and a technical solution.
I am a (retired) pilot who teaches A320 Type Conversions - I try to train pilots to cope with the...
Forum: Tech Log
7th Nov 2010, 07:11
Replies: 1,524
Views: 743,002
Posted By TyroPicard

All airliners have good and "not quite so good"...

All airliners have good and "not quite so good" features. All airlines have good and "not quite so good" SOP's.
If you read the CVR transcript you will not find one FMA call, not one ECAM caution...
Forum: Tech Log
27th Sep 2010, 12:03
Replies: 1,524
Views: 743,002
Posted By TyroPicard

FMA Calls?

The CVR transcript does not contain any FMA calls - presumably this was SOP in GXL.
When they put the a/c into Alternate Law there was no formal reading of ECAM message.
When USE MANUAL PITCH TRIM...
Forum: Tech Log
9th Jul 2010, 17:38
Replies: 1,524
Views: 743,002
Posted By TyroPicard

This would not have happened to a competent...

This would not have happened to a competent poster - he/she would have simply edited the previous post...
Edit: so that we knew which "to" was referred to.
Forum: Tech Log
8th Jul 2010, 17:18
Replies: 1,524
Views: 743,002
Posted By TyroPicard

BOAC Good question - no thoughts either way...

BOAC
Good question - no thoughts either way now, although my previous post assumes they selected it, it's just one of the events that the CVR might explain a little. The HYD key is next to the F/CTL...
Forum: Tech Log
8th Jul 2010, 10:34
Replies: 1,524
Views: 743,002
Posted By TyroPicard

You're right BOAC - I suppose 97°of bank might...

You're right BOAC - I suppose 97°of bank might have something to do with it...
Re sidesticks - there is no "master", the inputs are summed algebraically unless one pilot presses and holds the...
Forum: Tech Log
1st Jul 2010, 21:24
Replies: 1,524
Views: 743,002
Posted By TyroPicard

So it was not an aircraft that was working...

So it was not an aircraft that was working properly - another triumph of French analytical thought.
Forum: Tech Log
24th Jun 2010, 18:31
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Smilin Ed The AP trimmed the THS as the speed...

Smilin Ed
The AP trimmed the THS as the speed reduced.
Clandestino
I don't recall it being established that the THS was "stuck" - all we know from the published FDR data is that it did not move...
Forum: Tech Log
5th Mar 2009, 10:54
Replies: 1,524
Views: 743,002
Posted By TyroPicard

And for BOAC, the PFD speed scale The lowest...

And for BOAC, the PFD speed scale
The lowest speed value displayed on the PFD scale is 40 kt. and the scale stops at 30 kt. I seem to recall that pre-flight the "actual speed" index sits just below...
Forum: Tech Log
5th Mar 2009, 10:02
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Lemurian posted If you look at the CAS...

Lemurian posted


If you look at the CAS trace the CAS does not exceed the stall warning value until 15:45:16, at which time the a/c has a positive pitch rate which would increase Vs - the stall...
Forum: Tech Log
3rd Mar 2009, 19:21
Replies: 1,524
Views: 743,002
Posted By TyroPicard

I think NoD's summary seems accurate. Re...

I think NoD's summary seems accurate.

Re that last para and G capability


I have done some analysis and maths.... figures are approximate but I'm fairly confident that the big picture is...
Forum: Tech Log
3rd Mar 2009, 08:41
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Tree Yes, but I was responding to your...

Tree

Yes, but I was responding to your complaint about the A320 manuals

specifically with reference to the selection of TOGA thrust following the stall warning, and the subsequent control law...
Forum: Tech Log
2nd Mar 2009, 19:57
Replies: 1,524
Views: 743,002
Posted By TyroPicard

BEagle - correct. Lemurian - you do have to...

BEagle - correct.
Lemurian - you do have to hold the priority button. If you release within 40 seconds the other sidestick becomes live again.
Tree said

You are right, no mention, and the...
Forum: Tech Log
2nd Mar 2009, 14:17
Replies: 1,524
Views: 743,002
Posted By TyroPicard

A320 Probe Heat

One pushbutton (pb) on the overhead panel controls all probe (pitot, AOA, TAT) and window heat, static ports. Normally in AUTO - the AOA probes would have been heated when one engine running or a/c...
Forum: Tech Log
2nd Mar 2009, 11:34
Replies: 1,524
Views: 743,002
Posted By TyroPicard

BOAC Good to see you are finally reading the...

BOAC
Good to see you are finally reading the report! Re the CAS the report states:

CAS invalid below 40 kt. I can't explain the spikes but I'll bet Sir Fred's pension that the actual a/c airspeed...
Forum: Tech Log
2nd Mar 2009, 07:49
Replies: 1,524
Views: 743,002
Posted By TyroPicard

framer Are you referring to the Perpignan AOA...

framer
Are you referring to the Perpignan AOA on Takeoff and initial climb? That looks normal to me though I have not given it careful analysis, and the scale is too small to observe any anomalies....
Forum: Tech Log
2nd Mar 2009, 07:42
Replies: 1,524
Views: 743,002
Posted By TyroPicard

S.F.L.Y. wrote OK I'm with you now... ...

S.F.L.Y. wrote

OK I'm with you now...
15:45:50 CAS is 40kt - Abnormal attitude law, no autotrim.
15:45:52 CAS >60kt - back to Alternate law, autotrim enabled.
15:45:55 CAS 120kt pitch...
Forum: Tech Log
1st Mar 2009, 20:01
Replies: 1,524
Views: 743,002
Posted By TyroPicard

S.F.L.Y. you asked Nobody told me, I worked...

S.F.L.Y. you asked

Nobody told me, I worked it out using the FDR readout and FCOM 1. If > 50° NU pitch, or > 30°ND pitch, or below 60kt, Abnormal Attitude law applies, which is Alternate Law in...
Forum: Tech Log
1st Mar 2009, 14:41
Replies: 1,524
Views: 743,002
Posted By TyroPicard

CONF Most of that 25 seconds were spent in...

CONF

Most of that 25 seconds were spent in Abnormal Attitude law, with no Autotrim.

But the trim wheel should still work,so here's some THS questions for engineers/designers with specific...
Forum: Tech Log
1st Mar 2009, 14:04
Replies: 1,524
Views: 743,002
Posted By TyroPicard

From LandIT The THS setting is not...

From LandIT

The THS setting is not "programmed" to be left at an extreme setting - the autotrim was doing it's job perfectly and the THS setting was the natural result of the low speed, the a/c...
Forum: Tech Log
1st Mar 2009, 10:15
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Thanks,hardcore an accurate summary except for.. ...

Thanks,hardcore an accurate summary except for..


As I understand it the STALL STALL warning is produced by the ADIRS (ADR portion) - presumably the standby AOA probe angle via ADR 3 - nothing...
Forum: Tech Log
28th Feb 2009, 07:46
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Alpha-floor

For the avoidance of doubt - I have checked the relevant FCOM:

Alpha - floor (which incidentally is simply an A/THR mode independent of FBW protections) signal is provided by the FAC, when the AOA...
Forum: Tech Log
27th Feb 2009, 12:16
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Raven77 Thanks! Slip of the pen - I meant "when...

Raven77
Thanks! Slip of the pen - I meant "when we train low speed protections in normal law". Post edited.
TP
Forum: Tech Log
27th Feb 2009, 10:11
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Stall Warning

Stall Warning is only inhibited on the ground. From FCOM 1.34.10:

An aural stall warning is triggered when the AOA
is greater than a predetermined angle.
This angle depends on the:
-...
Forum: Tech Log
27th Feb 2009, 07:26
Replies: 1,524
Views: 743,002
Posted By TyroPicard

From the report pages 21/22: It may be...

From the report pages 21/22:


It may be that the only load factor readout is above/below 0.5g - no info.

alph2z

Rusty maths but I suspect you have calculated an average value over time, not...
Forum: Tech Log
26th Feb 2009, 17:10
Replies: 1,524
Views: 743,002
Posted By TyroPicard

THS - Trimmable Horizontal Stabiliser

In Normal and Alternate Law the autotrim moves the THS to keep the a/c in trim longitudinally. This ensures elevator authority in both directions.
In Direct Law the autotrim does nothing - the pilot...
Forum: Tech Log
26th Feb 2009, 09:58
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Which means... At 67°AOB your pitch-up...

Which means...
At 67°AOB your pitch-up capability is nil
At 33° AOB you can pitch up at 1.3G

Initial AOB during the final pitch-up was 45° ....
Forum: Tech Log
26th Feb 2009, 06:27
Replies: 1,524
Views: 743,002
Posted By TyroPicard

alph2z The Pitch Law is Alternate, with...

alph2z


The Pitch Law is Alternate, with load factor protection. The sidestick demands load factor - neutral =1g, the pilot was demanding maximum positive g with full back stick. The limit is 2g...
Forum: Tech Log
25th Feb 2009, 20:55
Replies: 1,524
Views: 743,002
Posted By TyroPicard

Abnormal Attitude Law

I have been puzzling over the lack of THS movement from fully nose-up. I can't explain the lack of THS movement while in Direct law.

But at 15:45:40 the Pitch Law reverts from Direct to Alternate...
Forum: Tech Log
25th Feb 2009, 17:34
Replies: 1,524
Views: 743,002
Posted By TyroPicard

NoD Two things may account for it.. The...

NoD
Two things may account for it..
The sidestick goes to neutral briefly then back to full nose down at 15:45:21, and both engines are producing Max EPR by 15:45:15. Plus a small increase in CAS -...
Forum: Tech Log
25th Feb 2009, 17:08
Replies: 1,524
Views: 743,002
Posted By TyroPicard

The stabiliser was nose up not down. That's why...

The stabiliser was nose up not down. That's why the full down elevator was not effective in reducing the pitch attitude - for more gen read my post back one page.
Forum: Tech Log
25th Feb 2009, 16:14
Replies: 1,524
Views: 743,002
Posted By TyroPicard

The importance of AoA probes... and FAC's. The...

The importance of AoA probes... and FAC's.
The FAC computes a/c gross weight, and displays limit speeds on the PFD - below 14,500 ft. the FAC uses AoA information as opposed to a "memorized" value...
Forum: Tech Log
8th Feb 2009, 08:36
Replies: 1,524
Views: 743,002
Posted By TyroPicard

PJ2 The sidestick has a fixed breakout force....

PJ2
The sidestick has a fixed breakout force. This is easier to overcome, with more control, if your hand is near the top - simple levers/moments theory.
A "small" movement at the base is a...
Forum: Tech Log
7th Feb 2009, 20:06
Replies: 1,524
Views: 743,002
Posted By TyroPicard

I disagree with your hand position. The sidestick...

I disagree with your hand position. The sidestick is designed to be held with the thumb on top, putting your index finger comfortably near the Transmit switch - if you can't fly and transmit...
Showing results 1 to 34 of 34


 
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