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Search: Posts Made By: MechEngr
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1st Aug 2020, 22:05
Replies: 29
Views: 11,136
Posted By MechEngr

Pretty much no suitable metal is safe forever...

Pretty much no suitable metal is safe forever around salt and water. Stainless steel is a marketing term. The technical term is corrosion resistant steel and the more resistant versions tend to gall...
25th Jul 2020, 05:09
Replies: 723
Views: 299,659
Posted By MechEngr

Bend alot This does not seem correct. The...

Bend alot

This does not seem correct. The change in pitch moment is regardless of the length of the aft fuselage. The shorter the aft fuselage the greater the required force to offset the pitch...
15th Jul 2020, 23:05
Replies: 224
Views: 72,690
Posted By MechEngr

The fate of the Ship of Theseus is in this boat's...

The fate of the Ship of Theseus is in this boat's future, if a hull can be said to be lucky. Considering that it certainly appears all the most costly technology was incinerated along with the island...
23rd Jun 2020, 19:45
Replies: 723
Views: 299,659
Posted By MechEngr

He claims the same flaw is also in the 777x. If...

He claims the same flaw is also in the 777x. If it is specific why would he omit the exact solution he had identified that is in accordance with the latest human factors practice?
23rd Jun 2020, 02:23
Replies: 723
Views: 299,659
Posted By MechEngr

He plainly states that some unidentified human...

He plainly states that some unidentified human factors design flaw was the problem with the 737 MAX and the 777x and that it has to do with not giving pilots critical information; this is very much...
21st Jun 2020, 21:14
Replies: 723
Views: 299,659
Posted By MechEngr

What, precisely, does Mr. Ewbanks propose as the...

What, precisely, does Mr. Ewbanks propose as the significant difference? What are the design flaws?

I have no doubt the he believes what he says, but engineering often produces a plateau of...
20th Jun 2020, 03:54
Replies: 1,674
Views: 2,753,836
Posted By MechEngr

My educated guess is that they gave the stick a...

My educated guess is that they gave the stick a yank and this deflected the elevator up, immediately producing a force down. While this also produces a pitch moment and eventually causes an increase...
31st May 2020, 00:49
Replies: 5
Views: 4,670
Posted By MechEngr

The explosion happened after the engine test was...

The explosion happened after the engine test was complete during the unused-fuel offloading phase. It does not appear to be caused by a flaw with the rocket, but instead the pipes carrying the liquid...
12th Mar 2020, 07:41
Replies: 28
Views: 16,612
Posted By MechEngr

The mention suggests that the nose gear on the G4...

The mention suggests that the nose gear on the G4 was damaged; It may be that more than a little leverage was involved.

It would not surprise me if the little jet was set onto one wingtip and the...
11th Mar 2020, 01:08
Replies: 379
Views: 162,180
Posted By MechEngr

Honestly, I wasn't going for subtle. The fact...

Honestly, I wasn't going for subtle.
The fact is that every accident or design problem can be fixed, in hindsight, if enough cash is thrown at it. But that certification would have looked cheap if...
10th Mar 2020, 19:35
Replies: 379
Views: 162,180
Posted By MechEngr

If a power wire loses its insulation and a...

If a power wire loses its insulation and a control wire loses its insulation and then something forces the conductors of the two wires together it is the same input as if a trim switch was used and...
9th Mar 2020, 22:46
Replies: 379
Views: 162,180
Posted By MechEngr

I think the question was the case where one AoA...

I think the question was the case where one AoA sensor / SMYD was reporting a stall when the other was not.
9th Mar 2020, 13:04
Replies: 379
Views: 162,180
Posted By MechEngr

Ok, but they are moving hydraulic valves via a...

Ok, but they are moving hydraulic valves via a cable and not moving the surface directly so there is no force feedback for the amount of trim discrepancy. That has to be a low-friction system,...
9th Mar 2020, 06:12
Replies: 12
Views: 4,765
Posted By MechEngr

At some point just having them loose without...

At some point just having them loose without regard to CG is a bad bad thing waiting to happen.
9th Mar 2020, 06:08
Replies: 379
Views: 162,180
Posted By MechEngr

I believe Airbus uses an electrohydraulic system...

I believe Airbus uses an electrohydraulic system to connect what look like fake trim wheels. I cannot tell if they are complete wheels or just an arc exposed above the console, but they provide no...
9th Mar 2020, 06:04
Replies: 379
Views: 162,180
Posted By MechEngr

Good. I was correct that it wasn't the FGCs,...

Good. I was correct that it wasn't the FGCs, which was the main point, that the software BA is generating is not controlling the stall warnings.
Thanks for the correction, but it's the same outcome...
8th Mar 2020, 23:36
Replies: 379
Views: 162,180
Posted By MechEngr

I believe the 737 stick-shaker and stall alert...

I believe the 737 stick-shaker and stall alert are operated by the ADIRUs directly. Earlier I wondered how the FGCs used the two inputs and was surprised to see they are bypassed to operate those...
8th Mar 2020, 23:04
Replies: 379
Views: 162,180
Posted By MechEngr

No. They only need to recall they have opposable...

No. They only need to recall they have opposable thumbs able to push the trim buttons.This is the thing that seems forgotten when a false stick-shaker/stall warning is going off. This was...
7th Mar 2020, 21:15
Replies: 379
Views: 162,180
Posted By MechEngr

It looks like BA installed a useful and...

It looks like BA installed a useful and fit-for-purpose, but not yet approved, Heads up guidance system that has since been approved for use in their aircraft. Cart before horse, apparently. I wonder...
6th Mar 2020, 15:12
Replies: 379
Views: 162,180
Posted By MechEngr

Yup - everything that Muilenburg did while the...

Yup - everything that Muilenburg did while the Board and this guy were watching and approving is terrible. </sarcasm>

This is exactly why CEOs get big payouts, it's in exchange for the chance...
6th Mar 2020, 03:49
Replies: 379
Views: 162,180
Posted By MechEngr

I saw this suggestion on a video by a 737 pilot...

I saw this suggestion on a video by a 737 pilot several months ago; I think he showed the breaker was over the shoulder of the left seat. I don't know if this disables both stick shakers, but if a...
27th Feb 2020, 16:49
Replies: 379
Views: 162,180
Posted By MechEngr

My understanding is the original process in...

My understanding is the original process in question was to force each hole to expand after each hole is drilled so that when the force is removed the inside surface of the hole is left in...
24th Feb 2020, 03:04
Replies: 60
Views: 42,460
Posted By MechEngr

I assume you mean that you were behind passengers...

I assume you mean that you were behind passengers who were being cleared at nearly 0 per hour, in which case you are still in line and will never leave. "Ages" to clear means it took some amount of...
23rd Feb 2020, 05:30
Replies: 60
Views: 42,460
Posted By MechEngr

The length of the queue does have something to do...

The length of the queue does have something to do with demand.

If they can process 100 passengers per hour and a 100 passenger plane arrives, then it will take 1 hour for the last person to clear....
23rd Feb 2020, 04:17
Replies: 60
Views: 42,460
Posted By MechEngr

I like that Airbus is still trying to worm out of...

I like that Airbus is still trying to worm out of a court declaration they received unfair government aid to develop the A380 on the grounds that it was such a failure that it did not affect Boeing....
Showing results 1 to 25 of 141
 


 
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