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7th May 2019, 02:04
Replies: 5
Views: 8,434
Posted By Machinbird

Yaw Control Factors

A friend of mine is familiar with the background on this aircraft and who knew the pilot has suggested that the yaw stability of the aircraft was not wonderful and speculated that an event like loss...
14th Apr 2019, 16:33
Replies: 5,129
Views: 10,186,792
Posted By Machinbird

Sir. Thinking like that is cruising for a...

Sir. Thinking like that is cruising for a bruising.
With flight control problems, you should typically go for the center of the envelope and avoid the corners of the envelope, then explore...
10th Apr 2019, 02:20
Replies: 5,129
Views: 10,186,792
Posted By Machinbird

Loose rivets It is entirely possible to change...

Loose rivets
It is entirely possible to change speed with a properly wound 3 phase motor by electrical means only, without resorting to clutches and alternate gear paths.
When motors are powered by...
Forum: Tech Log
8th Apr 2019, 03:28
Replies: 11
Views: 1,436
Posted By Machinbird

Elevator Feel Shift Module

Here is a schematic of the Elevator Feel Shift Module:

https://cimg3.ibsrv.net/gimg/pprune.org-vbulletin/640x400/elevfeelshiftmodule_9235dd64a0d796536669c870142469407a952ca7.png
ELEVATOR FEEL...
23rd Mar 2019, 18:51
Replies: 908
Views: 931,271
Posted By Machinbird

On the Indonesian accident traces, there were...

On the Indonesian accident traces, there were some pretty good indications that the nature of the real problem was some sort of sneak circuit in the port side SBYD box in the vicinity of the analog...
Forum: Tech Log
16th Mar 2019, 20:15
Replies: 195
Views: 79,209
Posted By Machinbird

KRUSTY, I see you are living up to your moniker,...

KRUSTY, I see you are living up to your moniker, however the time for legal ass covering is basically past. What is even more important now is brand reputation.
That has to be handled well, or the...
16th Mar 2019, 16:24
Replies: 908
Views: 931,271
Posted By Machinbird

Sorry, but not correct. MCAS strictly plays with...

Sorry, but not correct. MCAS strictly plays with the pitch sensitivity at high AOA. The way that it does this is the issue. I have no doubt that you could still pull the aircraft into a stall...
16th Mar 2019, 05:55
Replies: 908
Views: 931,271
Posted By Machinbird

Feel System force levels

Note: On realization of a significant oversight in my thoughts, I have revised my post below.

One of the stabilator equipped jets I used to fly started life with a rather steep stick force...
15th Mar 2019, 17:22
Replies: 921
Views: 2,116,659
Posted By Machinbird

So true, but not a problem IF you are below your...

So true, but not a problem IF you are below your cornering velocity. If well in excess, I would think that pulling throttles to idle and putting out speedbrakes would make a substantial improvement...
15th Mar 2019, 15:02
Replies: 921
Views: 2,116,659
Posted By Machinbird

Cornering Speed

Written from a fighter pilot viewpoint. When applying to a transport, there are going to be additional factors to consider such as control hinge moments, wing bending moment, and control system...
Forum: Tech Log
14th Mar 2019, 16:05
Replies: 146
Views: 41,740
Posted By Machinbird

No aircraft is perfect. They are a collection of...

No aircraft is perfect. They are a collection of engineering compromises.
Really know your aircraft, including all its warts and kluges!
Beg borrow or steal as much stick time as you can.
Know the...
12th Mar 2019, 19:49
Replies: 921
Views: 2,116,659
Posted By Machinbird

Imagine that! The AP has a dive bomb...

Imagine that! The AP has a dive bomb mode.:suspect:
10th Mar 2019, 20:28
Replies: 44
Views: 28,893
Posted By Machinbird

SKYHOOK-NOT LIKELY

For the skyhook theory folks, how high does a DC-3 wing sit during a wheel landing? Might that account for the smaller trees mostly remaining to the right on the crash scene photo while immediately...
10th Mar 2019, 17:30
Replies: 44
Views: 28,893
Posted By Machinbird

Referencing Airbubba's crash site picture: ...

Referencing Airbubba's crash site picture:
Looks like he landed on the road from right to left and either deliberately or inadvertently ground looped 90 degrees to the right.
The vegetation on the...
10th Mar 2019, 05:37
Replies: 921
Views: 2,116,659
Posted By Machinbird

Stabilizer Trim-Possible Failure Mode

About the only way to lose the nut engagement with a ball shaft is to lose the balls out of the nut.
These balls recirculate as the shaft turns, and anything that damages the recirculation pathway...
3rd Mar 2019, 19:43
Replies: 921
Views: 2,116,659
Posted By Machinbird

If they show the end of the unit that had the...

If they show the end of the unit that had the pinger attached, you can look to see if the sheared off tips of the bolts are still there.
Considering the relatively high pinger frequency, I doubt...
3rd Mar 2019, 18:50
Replies: 921
Views: 2,116,659
Posted By Machinbird

Pinger ?

Fresh from the accident scene, muddy, without a pinger attached.
Somehow, I don't think they were keeping an Allen wrench handy to immediately remove the pinger as soon as the unit was discovered.
3rd Mar 2019, 16:30
Replies: 921
Views: 2,116,659
Posted By Machinbird

That is one of the advantages of course. ...

That is one of the advantages of course.
Ultimately, whatever mount used has to allow the pinger/ULD to couple acoustic energy effectively into the water.

I suppose that the CVR/FDR recorder...
3rd Mar 2019, 01:24
Replies: 921
Views: 2,116,659
Posted By Machinbird

Thanks Airbubba. That was a useful reference. ...

Thanks Airbubba. That was a useful reference.
Guess I've seen pictures of too many CVRs being recovered from other countrys' waters.:(
2nd Mar 2019, 22:17
Replies: 921
Views: 2,116,659
Posted By Machinbird

No evidence of a pinger on this unit. Some...

No evidence of a pinger on this unit. Some significant distortion of the case in places. Likely the pinger was knocked off of it during the accident.

Considering how violent some of these...
1st Mar 2019, 05:53
Replies: 921
Views: 2,116,659
Posted By Machinbird

Military Accident-Possibly Similar

There was an accident in 1981 involving a military EC-135 that bears some resemblance to this B763 accident.
EC-135 loss of control (https://aviation-safety.net/database/record.php?id=19810506-0)
26th Feb 2019, 16:45
Replies: 921
Views: 2,116,659
Posted By Machinbird

Trim again

Used to be on some aircraft, that the trim could wind nose down until the A/P could not hold it.
Then the crew got handed a nasty surprise.
What kind of warnings and protections does the 76 have...
24th Feb 2019, 01:42
Replies: 921
Views: 2,116,659
Posted By Machinbird

Anyone have an idea what was in the cargo? ...

Anyone have an idea what was in the cargo?
Atlas advertises that they can handle outsize cargo. Was it just Amazon cargo or a commercial mix?
20th Feb 2019, 04:16
Replies: 474
Views: 1,390,704
Posted By Machinbird

vmandr, Thank you very much for the assistance....

vmandr, Thank you very much for the assistance. :ok:
It appears that MAK went to great lengths to validate the FDR data by running simulations of the flight using the recorded parameters.
As...
17th Feb 2019, 20:39
Replies: 474
Views: 1,390,704
Posted By Machinbird

FDR Information

I have been trying to review this accident with regard to the use of pitch trim. Did MAK ever publish the FDR readout? If so, could someone point me to it please?
This accident, Flydubai 981, and...
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