Gary, Gary, Gary, You don’t need a $30,000 GPS simulator to verify if a GPS product in your inventory has the rollover bug. You simply ask the supplier to certify that they don’t have the rollover bug. They use their _$100,000_ GPS simulator If needed, but usually it’s done with a trivial code review. If the supplier can’t provide such a certification, then they are no longer a supplier. This tends to persuade them to certify. If you as an air carrier (or any other critical GPS consumer) fail to ask for such a certification in time to field a replacement, that’s your fault. You might not be aware, but zero US air carriers had any unplanned downtime from the GPS rollover. I can’t say the same thing for certain Asian air carriers :) -mel via cell
On May 1, 2019, at 8:39 PM, Gary E. Miller <gem@rellim.com> wrote:
Yo Mel!
On Thu, 2 May 2019 03:30:03 +0000 Mel Beckman <mel@beckman.org> wrote:
I’m also an FAA licensed A&P mechanic, and have worked for airlines in fleet maintenance. Air carriers have extremely thorough systems reviews, by law, through the Airworthiness Directive program, which started identifying 2019 GPS rollover vulnerabilities in ... 2009! Nobody was surprised. If any GPS systems “went nuts”, it was through the incompetence and negligence of their owners.
How many GPS owners happen to have $30,000 GPS simulators to check their $300 GPS/NTP servers? Some of mine did, most did not.
Seems to me the negligence is in the GPS manufacturer that failed to notify their customers.
To be fair, Avidyne and Telit did notify their customers, but not with a fix or enough lead time to swap out the units.
RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 gem@rellim.com Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas? "If you can’t measure it, you can’t improve it." - Lord Kelvin