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Search: Posts Made By: MurphyWasRight
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9th Sep 2019, 20:44
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

A few possibilities, not of course mutually...

A few possibilities, not of course mutually exclusive:

A: One or more did but their concerns were brushed aside and they did not feel they could safely escalate. This brushing aside is more likely...
5th Sep 2019, 22:03
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

My bold in quote, main point is things are not...

My bold in quote, main point is things are not necessarily as simple as it seems;

1:AoA sensor is not active until enough airflow to move the vane, so position with zero airspeed is meaningless....
5th Sep 2019, 02:09
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

Not exact match to MCAS, at least in Lion AIr...

Not exact match to MCAS, at least in Lion AIr case the AOA value was in range..
The "bad packet check" is not possible in this case since there is (with a singe input) no way to check the data.
...
4th Sep 2019, 19:35
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

It is useful to keep in mind that as far as we...

It is useful to keep in mind that as far as we know the MCAS software worked exactly as specified/designed/implemented.
No amount of SW process can catch a system level specification error so while...
Forum: Jet Blast
30th Aug 2019, 12:58
Replies: 13
Views: 1,709
Posted By MurphyWasRight

Another factor can be the local meaning of some...

Another factor can be the local meaning of some terms, could not help but think of whether the resulting baby skateboards would look like you or the mother skateboard :)

Translated to 'mricun' the...
25th Aug 2019, 13:10
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

My bold in above. The above does not mention...

My bold in above.
The above does not mention the need to first get the aircraft in trim -before- cut off of electric trim which appears to be the fatal action by Ethiopian crew. Although not...
23rd Aug 2019, 18:44
Replies: 16
Views: 2,255
Posted By MurphyWasRight

No knowledge of the unit in question but at a...

No knowledge of the unit in question but at a generic level if the obvious cooling issues have been checked I would suspect that the issue could be related to the backlight for the LCD getting old....
23rd Aug 2019, 12:42
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

One can hope that the Lion air and Ethiopian...

One can hope that the Lion air and Ethiopian investigators did such testing early on before it became widely known and discussed.
In fact the Ethiopian accident suggests that the crew was not fully...
Forum: Jet Blast
11th Aug 2019, 23:18
Replies: 94
Views: 21,806
Posted By MurphyWasRight

Vaguely plausible that it worked the first time,...

Vaguely plausible that it worked the first time, that might explain the absurdly lenient deal he got. Possible he was "out of ammunition" or realized it was just to hot this time around.
Forum: Jet Blast
11th Aug 2019, 23:11
Replies: 94
Views: 21,806
Posted By MurphyWasRight

True that the images are bit 'un-similar' but...

True that the images are bit 'un-similar' but that does not prove anything.
Occam's razor probably would strongly favor sleazy newspapers fabricating the image over the a body switch in a federal...
8th Aug 2019, 13:10
Replies: 6
Views: 2,360
Posted By MurphyWasRight

Classic 'what could go wrong' tale. Through...

Classic 'what could go wrong' tale.

Through hole PCBs do have their advantages if the keep alive resistors were surface mount, especially in an array, you would have been really screwed.
I think...
7th Aug 2019, 23:52
Replies: 6
Views: 2,360
Posted By MurphyWasRight

Reminded of a long ago tip from a DEC (Digital...

Reminded of a long ago tip from a DEC (Digital Equipment Company) service person back in the day when some computers still had front panels with blinking lights and switches.

When replacing...
6th Aug 2019, 11:57
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

Also before getting deep into probabilities of N...

Also before getting deep into probabilities of N bits flipping it seems to me that the '5 bit flip' test is also a rational stand in for "something happens we have not though about",

In other...
28th Jul 2019, 12:32
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

This is getting to be depressingly similar to...

This is getting to be depressingly similar to Challenger shuttle disaster where the historical "prove it is safe to fly" mandate to engineers was inverted to "prove it is not safe to fly" due to...
22nd Jul 2019, 17:59
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

Now you've done it, the price will jump due to...

Now you've done it, the price will jump due to Prune interest and Boeing will take a further earnings hit :)

There are vendors that specialize in supporting old ICs, they sometimes even buy the...
22nd Jul 2019, 17:44
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

The report is very interesting reading, ARIANE 5...

The report is very interesting reading, ARIANE 5 Failure - Full Report (http://sunnyday.mit.edu/nasa-class/Ariane5-report.html) the 3.1 findings summarizes a series of assumptions that led to the...
17th Jul 2019, 01:10
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

For the NG there is probably an out by revising...

For the NG there is probably an out by revising the checklist to re-incorporate the use of 2 (auto and all) cutout switches.

Can probably make the case that non auto instigated trim runaway is...
12th Jul 2019, 22:07
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

(From memory) From discussion on older threads...

(From memory)
From discussion on older threads I don't believe we know for sure if the FDR trace reflects the stick tracer request/condition -or- the motor actually running, in other words not 100%...
12th Jul 2019, 13:59
Replies: 26
Views: 10,264
Posted By MurphyWasRight

The flip side of this is many flights where the...

The flip side of this is many flights where the seatbelt sign is left on for most of the flight, and not just on 1.5 hour hops one city over.
This leads to the fasten seatbelt sign being treated...
10th Jul 2019, 23:07
Replies: 47
Views: 28,680
Posted By MurphyWasRight

I have to admit my inner 13 year old mind read...

I have to admit my inner 13 year old mind read that as "brown streak", which would have more to do with the captains reaction :O
9th Jul 2019, 20:52
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

To be clear there was the same AoA fault on the...

To be clear there was the same AoA fault on the last 2 flights; the recorded values disagreed by a mostly constant 22 degrees.
The AoA system was not touched before the accident flight.
The AoA...
8th Jul 2019, 17:17
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

Working from memory, since I don't have time to...

Working from memory, since I don't have time to track original posts at the moment, I believe this was reported by Southwest and possibly others.
I don't think we know if this was discovered by...
8th Jul 2019, 14:43
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

It is important to remember that the AoA...

It is important to remember that the AoA miscompare alert was not an option.

It is a standard feature that Boeing knew was not working unless the optional AoA display was installed.

Boeing knew...
6th Jul 2019, 23:00
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

The unreported stick shaker was on the...

The unreported stick shaker was on the penultimate Lion Air flight, not Ethiopian.

Given that that aircrews are discouraged from failure diagnoses it would have been better to report 'what...
6th Jul 2019, 20:55
Replies: 2,383
Views: 2,111,189
Posted By MurphyWasRight

Very good point: If raw pitot pressure/speed...

Very good point: If raw pitot pressure/speed matches within a defined tolerance seems that triggering a full UAS warning would not be necessary since it could (as it likely did) distract from the...
Showing results 1 to 25 of 491
 


 
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