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Search: Posts Made By: deltafox44
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15th Apr 2019, 09:24
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

It shows it has been working on several...

It shows it has been working on several instances. It does NOT show whether it has failed on other instances, due to stick shaker or anything else, which could explain why they did not use it to trim...
13th Apr 2019, 11:52
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

No, the wing would be the worst place to measure...

No, the wing would be the worst place to measure AoA, since airflow perturbation is the highest there. The only place to get an good AoA is on a long stick ahead of the nose. Even there it would be...
12th Apr 2019, 23:17
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

I don't know if AoA value shown on the graph was...

I don't know if AoA value shown on the graph was value from the vane or value corrected by algorithms. I suppose both are recorded. Anyway, pitch rate correction cannot drive corrected value from...
12th Apr 2019, 22:57
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Reducing speed would have been also against what...

Reducing speed would have been also against what Boeing recommends in case of a severe AND mis-trim, which is increasing speed (not above VMO, though) in the hope of reducing elevator loads
10th Apr 2019, 13:59
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

It's just like saying they'll make an already...

It's just like saying they'll make an already safe aircraft safer. It sounds better that make a dangerous aircraft less dangerous :ooh:
MCAS was not there to prevent stall (which was already very...
10th Apr 2019, 13:52
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Here is what I was referring to (published by...

Here is what I was referring to (published by satguru) :
https://66.media.tumblr.com/24b35c04b87f41a3229fe6b6b67d9f06/tumblr_ppqyih34CG1umtbhho1_540.jpg
Recent training handbook also recommend...
9th Apr 2019, 22:07
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

No. AP has been ON for 33 seconds with AOA...

No. AP has been ON for 33 seconds with AOA disagree since the rotation. It disconnected only when the captain decided to maintain runway heading while the heading selector induced a right turn.

I...
9th Apr 2019, 21:56
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

I know that, thank you :{ At low speed and...

I know that, thank you :{

At low speed and with a limited amount of AND untrim, increasing speed may reduce or cancel aft column required, due to static stability of the aircraft. But in the case...
9th Apr 2019, 09:24
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

There would be no force on the stick without the...

There would be no force on the stick without the feel and centering system. It has been said that, for some reason, this system is not able to provide the extra force needed near stall. Of course it...
9th Apr 2019, 09:18
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

I see on good reason : at very high speeds a long...

I see on good reason : at very high speeds a long trim command would induce huge vertical acceleration, therefore you have to use it with caution, using actions of one second or so.

What I can't...
9th Apr 2019, 09:07
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

The 737 manuals says that incase of extreme...

The 737 manuals says that incase of extreme nose-down out-of-trim, one should INCREASE speed to relieve elevator load and permit manual trimming.

That's insane !

(see...
9th Apr 2019, 08:58
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

There is a clutch that ensures that manual trim...

There is a clutch that ensures that manual trim has priority on electric trim. So Yes, grasping the wheel should stop trim runaway.
8th Apr 2019, 23:43
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

737s are fly-by-cable, from the pre-electronics...

737s are fly-by-cable, from the pre-electronics era. 320, 380 and 787s are fly-by-wire, therefore their stabilizers do not have the same limitations
7th Apr 2019, 23:05
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Here "the trim to move" means "runaway...

Here "the trim to move" means "runaway continues". If it does not move anymore by itself, the manual trim still should be able to move (it is, when not blocked by too much loads)
7th Apr 2019, 11:26
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

As far as I understand english, it does not. It...

As far as I understand english, it does not. It says electric trim CAN be used to neutralise column forces before cutout (nobody would think it cannot, anyway). It says also Manual trim can be used...
6th Apr 2019, 23:47
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Please let's all forget the roller coaster...

Please let's all forget the roller coaster theory. At 340 kt releasing aft column pressure would mean negative g's. So if you want to have the time to make the numbers of turns of the trim wheel you...
6th Apr 2019, 23:27
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

99.9%, really ? The pilots of the 2 last...

99.9%, really ?

The pilots of the 2 last Lion Air flights did it. The Copilot in Lion Air crash and the Captain in ET302 did not. That's only 50% !

By the way, when speaking that an "average...
6th Apr 2019, 22:43
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Less oxygen coming to the brain also. May be...

Less oxygen coming to the brain also. May be negligible, especially as they were used to this altitude, not higher than cabin altitude in flight.
6th Apr 2019, 22:36
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Not so. Step 2 is "Autopilot (if engaged)...

Not so. Step 2 is "Autopilot (if engaged) disengage". A/P was no longer engaged. So forget Step 2. Even if you don't, it says "Control pitch with column and trim". The pitch has been controled, the...
5th Apr 2019, 23:18
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

People got used to software updates... Windows...

People got used to software updates... Windows needs updates after each security fault detected, Boeings need an update after each crash :ooh:
5th Apr 2019, 23:02
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

The nose up moment of the engines thrust may be...

The nose up moment of the engines thrust may be important at lower speeds, but negligible at higher speeds, since the thrust is constant but any other aerodynamic moments vary as the square of speed....
5th Apr 2019, 22:39
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Attempted level was FL320 ! With stall...

Attempted level was FL320 !

With stall warning and attempting to clear the terrain, more speed means more potential energy, so I think overspeed was not on top of their priorities.

If Boeing...
5th Apr 2019, 17:36
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Unbelievable ! But that would explain why the...

Unbelievable ! But that would explain why the electric trim ANU stopped twice at about the same position (2.3/2.4 units).
5th Apr 2019, 15:06
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Yes, a broken (losing its "winglet" part) or...

Yes, a broken (losing its "winglet" part) or departing vane would explain AoA vs. gees curve and AoA heater fault.

If not a bird strike, it could be a previous damage which would have almost...
5th Apr 2019, 14:45
Replies: 5,129
Views: 10,252,655
Posted By deltafox44

Would the trim motor not be able to move the...

Would the trim motor not be able to move the stab, we would still see the trim command from the pilot.

The same when trim cutout switches were off, we don't see any change in stab position but we...
Showing results 1 to 25 of 63
 


 
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