[SystemSafety] GPS jamming

Peter Bernard Ladkin ladkin at causalis.com
Fri Jul 19 16:34:03 CEST 2019

On 2019-07-19 16:12 , Robert P. Schaefer wrote:
> Surprise! it may have been a GPS receiver bug, and not jamming:
> https://ops.group/blog/rockwell-gps/

The XL has a Honeywell Primus system; the XLS+ an RC ProLine 21. Prima facie the incident aircraft
was the former (they are both designated C560X for ATC purposes, but the reporter and NASA said C560XL).

> "... the cause of the problem was tracked
> back to the receivers’ failure to compensate for the “leap second” event which happens once every
> 2.5 years when the US Government update their satellites – which they did on 9th June."

Incident date was 2018-08. That is a year and a half after the last leap-second update according to
this report.

We also know that jamming was occurring, because the reporter said so.

But for all that, yes, it could have been an avionics bug.


Prof. Peter Bernard Ladkin, Bielefeld, Germany
Je suis Charlie
Tel+msg +49 (0)521 880 7319  www.rvs-bi.de

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