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Search: Posts Made By: MechEngr
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Forum: Rumours & News
17th Dec 2019, 20:29
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

Having negative lift will usually be the greater...

Having negative lift will usually be the greater concern.
Forum: Rumours & News
16th Dec 2019, 09:37
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The customer drumbeat of "no new training/no new...

The customer drumbeat of "no new training/no new endorsement" was clear.

The Max was supposed to ship with the AoA disagree alert, but it does not appear that it specifically alerts that that's...
Forum: Rumours & News
16th Dec 2019, 08:18
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

Was the 70 degree nose up report to the other...

Was the 70 degree nose up report to the other systems true?
The AoA sensor did not electrically fail. Nothing was inoperative. It was reporting the wrong information. Is there some other term for...
Forum: Rumours & News
16th Dec 2019, 06:31
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

We have two crashes because the AoA system lied....

We have two crashes because the AoA system lied. I don't need to fly a plane to know that.
It should have told the truth and signaled the equivalent of "The data is wrong" instead of reporting an...
Forum: Rumours & News
16th Dec 2019, 02:38
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

If you meant to say the dashpot loads up the...

If you meant to say the dashpot loads up the drive gear so the dash pot might make the drive gear slip, that's a good point, but the dash pot load is proportional to rate, so it would produce a...
Forum: Rumours & News
16th Dec 2019, 02:11
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

D-shaped shaft or splined shaft have clearance...

D-shaped shaft or splined shaft have clearance that has to be taken out somehow. Usually on a D-shaft there is a setscrew set against the flat. Splines are a poor choice for reversing loads. If not...
Forum: Rumours & News
16th Dec 2019, 01:46
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The stab only has to outpace the pitch rate of...

The stab only has to outpace the pitch rate of the entire aircraft and only slightly to linearize the control response to offset the contribution of the engine nacelles. It doesn't pitch up; it just...
Forum: Rumours & News
15th Dec 2019, 18:28
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

It looks to me that the setscrews index the...

It looks to me that the setscrews index the resolver to the balanced assembly of the vane and the counterweight and that the counterweight is indexed to the vane with a flat on the side of the vane...
Forum: Rumours & News
15th Dec 2019, 00:03
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

There are two; what MCAS does when the AoA system...

There are two; what MCAS does when the AoA system fails and what it does when the AoA system is working correctly.

Example - there was no neutral-gear detect switch in my former manual...
Forum: Rumours & News
14th Dec 2019, 22:03
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

With enough AND trim, the plane will be forced to...

With enough AND trim, the plane will be forced to a negative G maneuver, regardless of how much ANU elevator is used. Both planes experienced negative G and likely high control pull forces at the end.
Forum: Rumours & News
14th Dec 2019, 05:15
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

OldnGrounded It was not a secret by the time...

OldnGrounded

It was not a secret by the time the ET302 flight crashed. I knew how it was working with the failed AoA data and how it responded to the pilots from the preliminary report that was...
Forum: Rumours & News
14th Dec 2019, 04:41
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

It responds to trim switch inputs, from the...

It responds to trim switch inputs, from the pilots. Not only does it stop immediately, it resets. Had the pilots let the trim switches alone MCAS would have run once and stopped out of trim. Had they...
Forum: Rumours & News
14th Dec 2019, 04:34
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

It resets on pilot input to the trim switches....

It resets on pilot input to the trim switches. Those are pilot inputs.
Forum: Rumours & News
13th Dec 2019, 20:04
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The 10 second time limit is for when a pilot...

The 10 second time limit is for when a pilot ignores the increasing angle of attack and increasing control force and continues to pull the wheel farther back, It's not a full-shot on every excursion....
Forum: Rumours & News
13th Dec 2019, 09:39
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The 10 seconds is for the independent...

The 10 seconds is for the independent determination of which set of instruments is reliable in a one-side stick shaker. I don't know how to tell if pilots are unable to feel control forces, but the...
Forum: Rumours & News
13th Dec 2019, 09:11
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

My gut feeling (which isn't worth much and needs...

My gut feeling (which isn't worth much and needs some data from Boeing to actually decide) is that the whole reason for this situation is that the contribution of MCAS in normal operations is slight...
Forum: Rumours & News
13th Dec 2019, 08:51
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

There is no "runaway stabilizer." That term I...

There is no "runaway stabilizer." That term I specifically avoided because it's subjective. Sometimes the trim runs. And then stops. If it reaches the mechanical stop was it running away anymore?...
Forum: Rumours & News
13th Dec 2019, 07:57
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

There was both a trim increment from the control...

There was both a trim increment from the control wheel switch from one of the pilots and an autopilot fail warning that would only be issued if they tried to re-engage the autopilot. Both re-enabling...
Forum: Rumours & News
13th Dec 2019, 02:30
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

Seems like the cure is to simplify the checklist:...

Seems like the cure is to simplify the checklist:
Are the following happening:
1) autopilot kicked out unexpectedly
2) pitch trim moving unexpectedly
3) pitch control force increasing...
Forum: Rumours & News
10th Dec 2019, 18:04
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The "taller" undercarriage is a temporary...

The "taller" undercarriage is a temporary extension capacity used during take-off and probably landing. It squats back to the original height at all other times, placing the engines close to the...
Forum: Rumours & News
10th Dec 2019, 00:18
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

1.6m longer? So 3 rows?

1.6m longer? So 3 rows?
Forum: Rumours & News
9th Dec 2019, 17:05
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

In this instance I was pointing out that...

In this instance I was pointing out that comparing the cost to Boeing to make changes that made no business sense vs the cost of the current delay cannot be a basis of criticizing the decision. The...
Forum: Rumours & News
8th Dec 2019, 21:59
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

This is true. It would also result in a plane...

This is true. It would also result in a plane that Boeing's customers did not want as it would not fit into their existing 737 operations.

20/20 hindsight is rarely a useful thing. By the time one...
Forum: Rumours & News
7th Dec 2019, 18:28
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The trim cutout switches in the control column...

The trim cutout switches in the control column are a red herring. The Lion Air preliminary report gave the exact steps that were taken to save the plane and the exact steps that crashed the same...
Forum: Rumours & News
7th Dec 2019, 01:23
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

All of that information was made available to...

All of that information was made available to Ethiopian Airlines prior to the crash and the Ethiopian pilots, the management, and Ethiopia's CAA all knew what training the pilots had. Since the plane...
Forum: Rumours & News
2nd Dec 2019, 21:39
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

I agree, the presence of wing twist and variation...

I agree, the presence of wing twist and variation in section to account for spanwise flow changes makes wing sections a less desirable reference on an aircraft.

Pitch is still not AoA even if...
Forum: Rumours & News
2nd Dec 2019, 14:25
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

There is no definition for "runaway trim" so it...

There is no definition for "runaway trim" so it is impossible to diagnose it.

What is clear is that if one determines "runaway" as continuously operating, then any such motion will stop at the...
Forum: Rumours & News
1st Dec 2019, 20:48
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

That requirement should be per each country of...

That requirement should be per each country of registration Civil Aeronautics organization to determine as well as the carrier's insurance. I expect that any plane that Boeing is not allowed to...
Forum: Rumours & News
30th Nov 2019, 10:28
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

The ET302 crew was also trying to re-enable the...

The ET302 crew was also trying to re-enable the autopilot as seen by the auto-pilot alarm indication in the data traces.

In any case, they did not have enough altitude to invert the plane. The...
Forum: Rumours & News
22nd Oct 2019, 04:53
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

GlobalNav, The stall detection software ran...

GlobalNav,

The stall detection software ran the stick shaker, falsely reporting a stall condition, which caused the Ethiopian pilots to initially not reduce power, sending them down a very...
Forum: Rumours & News
21st Oct 2019, 19:37
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

That's easy - Airbus is entirely based on the...

That's easy - Airbus is entirely based on the same sort of software covering for aerodynamic quirks that MCAS was intended for, but since Airbus cut all the connections they were forced to use a far...
Forum: Rumours & News
12th Oct 2019, 22:56
Replies: 4,656
Views: 4,791,138
Posted By MechEngr

Technically the stick shaker system didn't...

Technically the stick shaker system didn't either.

MCAS does not alert the crew to an impending stall and, though it may be a stall avoidance system, it doesn't identify the condition.

That...
Showing results 1 to 32 of 32


 
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