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Search: Posts Made By: Mad (Flt) Scientist
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Forum: Rumours & News
11th Dec 2019, 16:15
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

I also wonder if this somewhat third hand...

I also wonder if this somewhat third hand information passed through hands which don't understand the difference.

I can easily imagine someone who has had a briefing (but without notes given) then...
Forum: Rumours & News
2nd Dec 2019, 21:06
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

It certainly can be., if you define it that way. ...

It certainly can be., if you define it that way.

On aircraft with a fuselage mounted AOA sensor, it makes sense to use the fuselage as the reference, not some hypothetical wing chordline. Which is...
Forum: Rumours & News
28th Nov 2019, 13:08
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

But the whole point of delegating such functions...

But the whole point of delegating such functions is that the FAA (and other authorities, this isn't just an FAA issue) do not have the manpower to do all these tasks under normal circumstances. I...
Forum: Rumours & News
27th Nov 2019, 20:55
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

Other than politics (which is obviously huge) I...

Other than politics (which is obviously huge) I fail to see how the issuance of CofAs or similar has any relationship to design approval and TC issue. It's not even the same groups of people involved...
Forum: Rumours & News
27th Nov 2019, 20:51
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

Differ on your "differ". As you say, DAL-A...

Differ on your "differ".

As you say, DAL-A is fundamentally a SOFTWARE assurance process not a systems design assurance process. For a holistic systems design process with rigour with regard to...
Forum: Rumours & News
25th Nov 2019, 15:33
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

All DAL-A assures is that the software does what...

All DAL-A assures is that the software does what the software requirements say it should do, not that those requirements are themselves correct or complete. That's a SYSTEMS requirements issue not a...
Forum: Rumours & News
5th Aug 2019, 18:05
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

Not saying this WAS the logic, but one...

Not saying this WAS the logic, but one possibility.

Trim switches usually have multiple contacts, to try to prevent single failures causing runaways. There may be logic (even just basic wiring...
Forum: Rumours & News
2nd Aug 2019, 02:42
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

I think some people are overestimating the...

I think some people are overestimating the difficulty of a software design change.

Having been part of a significant software redesign of a flight control system for a part 25 aircraft, which...
Forum: Rumours & News
29th Jul 2019, 19:37
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

Probably yet more thread drift, for which...

Probably yet more thread drift, for which apologies. But I recall that an industrial turbine (which really are not that different from their aircraft-mounted cousins, and in this case was a...
Forum: Rumours & News
12th Jun 2019, 20:24
Replies: 4,656
Views: 4,791,248
Posted By Mad (Flt) Scientist

In that context, note the warning about post...

In that context, note the warning about post anonymity stickied at the top of the forum. None of us are REALLY anonymous.

And if "we" can "guess" someone's general work role, someone who KNOWS...
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