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Search: Posts Made By: Speed of Sound
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10th Oct 2019, 22:38
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

When it starts to affect the forecast...

When it starts to affect the forecast profitability of whatever product is being developed.
9th Oct 2019, 16:13
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Given that this will to be the most picked over...

Given that this will to be the most picked over fix in aviation history, where the regulator will be under as much scrutiny as the manufacturer, both Boeing and the FAA would be very foolish to try...
9th Oct 2019, 11:43
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

And EASA too, as I assume that the FAA are...

And EASA too, as I assume that the FAA are sharing a lot of quite detailed information about the various solutions.
1st Oct 2019, 21:28
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

The pilots’ abilities in a situation like ET and...

The pilots’ abilities in a situation like ET and Li need to be broken down into two distinct parts.

The first is their knowledge, understanding of, and ability to successfully carry out to the...
1st Oct 2019, 15:36
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

With hindsight and looking at how light the...

With hindsight and looking at how light the regulatory hand of the FAA was on this whole process, they may have been able to slide this through the certification process without raising it as much of...
1st Oct 2019, 10:29
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

I can’t locate the original press statement but...

I can’t locate the original press statement but this is almost word for word what Boeing said in July.

So what has been happening during the past two months?
30th Sep 2019, 23:37
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Very true, however if the various authorities...

Very true, however if the various authorities take a belt and braces approach to recertification of the MAX, Boeing may have to both improve training and make improvements to the manual trim system...
30th Sep 2019, 22:59
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

The fact that some crews are struggling to turn...

The fact that some crews are struggling to turn the trim wheel in some situations can be classed as partly a lube problem because some of the effort that they are putting into turning the jackscrew...
30th Sep 2019, 21:58
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

It’s been a while now but around that time, I...

It’s been a while now but around that time, I remember a number of crews (maybe Qantas, maybe not) flew the QF32 scenario in the sim and less than half of those crews saved the plane.
30th Sep 2019, 18:06
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

QF32 landed safely due to some excellent fault...

QF32 landed safely due to some excellent fault analysis, incredible workflow management, cool heads, and a lot of luck

An aircraft should be capable of being operated safely by any crew trained to...
30th Sep 2019, 16:32
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

So did QF32 but Rolls Royce still investigated...

So did QF32 but Rolls Royce still investigated the reason for the incident and changed out the offending oil pipe.
30th Sep 2019, 14:20
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Agreed, and I suspect that runaway trim will...

Agreed, and I suspect that runaway trim will feature more in future training and sim scenarios. However, now that the Pandora’s box of trim wheel operation has been opened, it will have to be...
30th Sep 2019, 13:46
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

The diameter of the trim wheel. Only an inch...

The diameter of the trim wheel.

Only an inch I know, but this reduces the turning moment by over 10%. This seems to have reduced the gearing to an extent where something which was ‘difficult but...
30th Sep 2019, 09:40
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

So what procedure is in place to aid a pilot...

So what procedure is in place to aid a pilot manually trimming a seriously out of trim stabiliser?

EASA among others seem to think that it is still a problem. Saying that a pilot shouldn’t allow...
29th Sep 2019, 23:08
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

If you look at my initial post, I was replying to...

If you look at my initial post, I was replying to someone who wanted to know ‘if it was friction’ which was causing the difficulties in moving the trim wheel under higher aerodynamic loads. Yes, I...
29th Sep 2019, 21:28
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

it would indeed, but would require less torque to...

it would indeed, but would require less torque to move the mechanism as all that torque would be used to move the mechanism rather than some of it being lost in opposing frictional forces.
29th Sep 2019, 20:14
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Yes, the pivot points share the load, but not all...

Yes, the pivot points share the load, but not all of it.

At the point where the clutch connecting the screw jack to the electric trim motor starts to slip or the manual trim wheels can no longer...
29th Sep 2019, 18:59
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Thanks for that. The ball nut seems to be...

Thanks for that. The ball nut seems to be transferring the load from the jack screw threads to the attachment point of the ‘ball nut’.

Watching it made me wonder whether there may be a lubrication...
29th Sep 2019, 17:16
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Clamp a hex nut tightly in a vice. Thread a...

Clamp a hex nut tightly in a vice.

Thread a six inch long bolt through the nut and keep turning. Now apply a side load to the bolt and repeat the exercise. The more side pressure you apply the...
29th Sep 2019, 14:41
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

A simple question which I’m not sure has been...

A simple question which I’m not sure has been discussed.

If the original amount of MCAS authority was required for certification, then how can the revised software which gives MCAS a reduced...
28th Sep 2019, 17:18
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

“It’s too stiff Captain, it won’t turn!”

“It’s too stiff Captain, it won’t turn!”
28th Sep 2019, 13:23
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Not if EASA have anything to do with it, as they...

Not if EASA have anything to do with it, as they have raised it as another separate/parallel issue to MCAS. And let’s not forget that the manual trim system is exactly the same system as on the NG.
28th Sep 2019, 08:51
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

So presumably the system has been reviewed every...

So presumably the system has been reviewed every time there has been a change in size, shape and geometry of the HS as well as the speed at which it operates.
27th Sep 2019, 23:15
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

By definition, here is only one maximum.

By definition, here is only one maximum.
27th Sep 2019, 15:02
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

The torque must have been measured (or...

The torque must have been measured (or calculated) when the original trim wheel gearing was designed. I assume that when the wheel diameter was reduced they left the rest of the system unaltered,...
27th Sep 2019, 12:50
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Has anyone actually calculated the torque...

Has anyone actually calculated the torque required to move the stabiliser under maximum aerodynamic load? As the friction forces to be overcome on the threads of the screw-jack will increase...
25th Sep 2019, 13:36
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Difficult because of the authority gradient...

Difficult because of the authority gradient between instructor and trainee I know, but at this point a good student should ask “Yes, but what if .........?”, especially if they are armed with the...
23rd Sep 2019, 22:59
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Surely that depends on your definition of AoA...

Surely that depends on your definition of AoA input?

No, there is no direct relationship between AoA value and attitude, however while MCAS operates, either as it should or under fault conditions...
23rd Sep 2019, 21:54
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Why in god’s name was this offered as an optional...

Why in god’s name was this offered as an optional extra?

The second vane was there. The wiring to the FCC was there, the software which compared the two values and outputted an annunciation was...
20th Sep 2019, 09:14
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Tried what on? Australian regulators have a...

Tried what on?

Australian regulators have a duty of care to all who fly in Australian airspace.
16th Sep 2019, 10:56
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

They’re not. Most of those recently...

They’re not.

Most of those recently recruited ‘technicians’ are there to do the work necessary to return the grounded aircraft to a serviceable condition to fly again and are not involved with any...
12th Sep 2019, 20:26
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

Unfortunately I suspect that senior management at...

Unfortunately I suspect that senior management at Boeing see the FAA as a sub-contractor charged with sorting out their regulatory problems for them. Even worse, I’m sure there are people at the FAA...
12th Sep 2019, 15:42
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

It will be a joint decision by all aviation...

It will be a joint decision by all aviation authorities.

Anything else would be madness.
12th Sep 2019, 13:59
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

The FAA will eventually come to an accommodation...

The FAA will eventually come to an accommodation with other authorities, and I can’t help thinking that sim training will be part of the final agreement, especially as accident reports will soon be...
12th Sep 2019, 09:47
Replies: 4,656
Views: 4,756,309
Posted By Speed of Sound

In that case, can you point out which of EASA’s...

In that case, can you point out which of EASA’s additional concerns do not need addressing?
Showing results 1 to 35 of 111
 


 
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