[SystemSafety] System safety: software vs. hardware including aircraft hardware

[Mumaw, Randall J. (ARC-TH)[SAN JOSE STATE UNIVERSITY]]

Nice description of potential hardware and software issues.
I would also add pilot performance as a critical element of the safety analysis.

Hardware and software systems will not be always reliable and when there is a failure, the last line of defense
is the pilot / flightcrew.  The safety analysis needs to ensure that there are strong cues for the flightcrew in the interface
that aid them in recognizing the problem and taking appropriate actions in a timely way.  Major elements are
- salient alerting or other markers
- clear understanding of the nature of the problem
- link to appropriate actions
- no barriers to performing those actions

While we await the accident reports and a factual account, it is useful to watch for how well the interface supported the
flightcrew response.

Randy

Randall J. Mumaw, Ph.D.

NASA Ames Research Center
Mail Stop 262-4
Bldg. 262, Rm. 290-B
P.O. Box 1
Moffett Field, CA  94035-0001

randall.j.mumaw at nasa.gov<mailto:randall.j.mumaw at nasa.gov>
randall.mumaw at sjsu.edu<mailto:randall.mumaw at sjsu.edu>

(650) 604-5368 (office)
(206) 852-7405 (mobile)



From: systemsafety <systemsafety-bounces at lists.techfak.uni-bielefeld.de> on behalf of "E. Douglas Jensen" <jensen at real-time.org>
Date: Monday, March 25, 2019 at 7:25 AM
To: "systemsafety at lists.techfak.uni-bielefeld.de" <systemsafety at lists.techfak.uni-bielefeld.de>
Subject: [SystemSafety] System safety: software vs. hardware including aircraft hardware

For those who haven’t seen this, it is well put.
https://drive.google.com/file/d/1249KS8xtIDKb5SxgpeFI6AD-PSC6nFA5/view?fbclid=IwAR0XjHLmehzfLmgxTDVNrHsfy-4ycdEVWfN-rC4-l8FCTzQf-D9NH-AOs60<https://urldefense.proofpoint.com/v2/url?u=https-3A__drive.google.com_file_d_1249KS8xtIDKb5SxgpeFI6AD-2DPSC6nFA5_view-3Ffbclid-3DIwAR0XjHLmehzfLmgxTDVNrHsfy-2D4ycdEVWfN-2DrC4-2Dl8FCTzQf-2DD9NH-2DAOs60&d=DwMFAg&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiMk5Csz9Zk&r=rv8LyTWOxcandTc-lwZkPhpQZazfxXyRACOCbbCdUBU&m=k12-FKss79hkiQF3nf2IhiU5rJrUvdO1GtnDNHi0Qbw&s=CBdr7LDEzRL5UnF7fPlu4WiMdeZ8PXcNYekqYJSV9j8&e=>



E Douglas Jensen
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Cell 508-728-0809
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