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Forum: Tech Log

7th Jul 2011, 22:30

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

PJ2, Thanks for your answer. Then, there...

PJ2,

Thanks for your answer. Then, there is perhaps a (remote) possibility that a PNF could suspect inadequate pitch inputs by the PF by noticing from the corner of an eye the trimwheel moving...

Forum: Tech Log

7th Jul 2011, 15:22

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Does the trimwheel move when autotrim is active ?

Does the trimwheel move when autotrim is active ?

Forum: Tech Log

6th Jul 2011, 23:47

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

bubbers44 and PJ2, re CAS / Mach with trapped...

bubbers44 and PJ2, re CAS / Mach with trapped total pressure.

I computed them with functions from an old (but long tested) homemade personal software (hey, I can do sfwr). It is not rocket...

Forum: Tech Log

6th Jul 2011, 17:14

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Question raised 3 days ago by bubbers44: ...

Question raised 3 days ago by bubbers44:

Assuming a blocked pitot (business end + drain) and total pressure trapped inside the tube at FL350 / 275 KCAS / M 0.808 yelds:

FL375 / 302 KCAS...

Forum: Tech Log

6th Jul 2011, 12:51

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Auto-trim is necessary in order to implement a...

Auto-trim is necessary in order to implement a load factor demand pitch law. The aim is to get a constant path free stick behavior, i.e. a path independent of speed, thrust or configuration. I didn’t...

Forum: Tech Log

28th Jun 2011, 13:14

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

There is evidence of absence. You can do the...

There is evidence of absence. You can do the energy calculation yourself or look at http://www.pprune.org/tech-log/454653-af-447-thread-no-4-a-10.html#post6523817

Forum: Tech Log

28th Jun 2011, 09:49

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Hi HN39, re # 452 I too started my career...

Hi HN39, re # 452

I too started my career with mechanical controls and I have really nothing against FBW or automation: I enjoyed it during my last 10 years on the 777. Perhaps it is not...

Forum: Tech Log

27th Jun 2011, 12:56

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Why are we not steering our cars with a knurl?

The way we flew airplanes before FBW had been refined over decades and was satisfying almost everyone. Why change? Why did Airbus needed to invent a new way of flying airplanes? Until now, I fail to...

Forum: Tech Log

25th Jun 2011, 16:00

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

There are at least 5 computer systems monitoring...

There are at least 5 computer systems monitoring airspeed: 2 FMGECs and 3 FCPCs (a weird architecture for me but what do I know?).

The previous 2 or 3 days discussions suggested the following...

Forum: Tech Log

23rd Jun 2011, 16:54

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Hmmm, doesn't the A/C makes inputs of its own in...

Hmmm, doesn't the A/C makes inputs of its own in ALT law, trimming the THS ? Sure, this was due to strange PF inputs but was he really aware of the move ? Don't you agree that even without pilot...

Forum: Tech Log

22nd Jun 2011, 12:52

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

But the FDs may have automatically re-engage a...

But the FDs may have automatically re-engage a dozen seconds later when ADR3 came on line again with coherent airspeed. In what mode would they re-engage then (the throttles being in the TOGA gate) ?

Forum: Tech Log

19th Jun 2011, 20:48

Replies: 1,069

AF 447 Thread no. 4

Views: 280,107

Posted By DJ77

Occam's Razor, yes and also simple physics. ...

Occam's Razor, yes and also simple physics.
The potential/kinetic energy transfert calculation shows that at 37500 ft TAS should be 413 kt @ Std + 10 assuming constant thrust and drag. The BEA...

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