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Forum: Tech Log

7th Apr 2020, 07:18

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

Exactly. Of course the reset happens...

Exactly.

Of course the reset happens automatically every time the aircraft is powered down. It sounds like it never occurred to Boeing or the FAA that you could have a scenario where an aircraft...

Forum: Tech Log

5th Apr 2020, 22:32

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

Counters, and microprocessor registers in...

Counters, and microprocessor registers in general, typically have a capacity that corresponds to some multiple of 8 bits.

For example a 16-bit counter isn't capable of counting beyond 65,535 (one...

Forum: Tech Log

5th Apr 2020, 22:16

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

You could have just left it at "I can't explain",...

You could have just left it at "I can't explain", then three words would indeed have sufficed.

Forum: Tech Log

5th Apr 2020, 06:23

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

Fine. In that case, feel free to tell us how the...

Fine. In that case, feel free to tell us how the 51 days is really derived.

Use more than three words, if you need to. :O

Forum: Tech Log

4th Apr 2020, 18:20

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

A common tick counter period in real-time systems...

A common tick counter period in real-time systems is 1.024 ms (don't ask me why!). That works out at 50.9 days.

Forum: Tech Log

4th Apr 2020, 07:58

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

EASA AD 2017-0129 concerned unmodded A350...

EASA AD 2017-0129 concerned unmodded A350 aircraft where various avionic systems stopped talking to each other after 149 hours of continuous power-up.

There was also a previous 787 AD in 2015...

Forum: Tech Log

4th Apr 2020, 06:30

Replies: 35

Boeing 787s must be turned off and on every 51 days

Views: 20,775

Posted By DaveReidUK

Interesting. Given that some 787s haven't...

Interesting.

Given that some 787s haven't flown for nearly a year now as a consequence of the Trent 1000 problems, one wonders why this issue appears only to have surfaced now ?

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