Useful stuff

Here’s a collection of tools, references and links that I’ve collated or developed over the years. If I’ve developed them they are invariably based on the work of others whom I gratefully acknowledge. They’re provided under a general attribution, non-commercial creative commons license unless otherwise modified within the specific work (for example the Def-Stan 00-55 is crown copyright) and of course they are provided ‘as is’ with no warranty.



Compliance findings. A short tutorial on the mechanics of compliance finding in the ADF Airworthiness regime as per AAP 7001.053 the RAAF’s Technical Airworthiness Management Manual (TAMM).

Definitions of hazard. As the name implies a collection of definitions of hazard, it’s interesting how such a central concept of safety engineering is so elusive.Wittgenstein may be able to shed some light on the matter.

Def Stan 00-55 (part 1 and Part 2). The withdrawn UK Defence standards for software safety, an interesting standard which was (I think) one of the first to be integrated with a higher level system safety standard.

Functional reach tool. A simple excel based tool, intended for concept design, that can be used to calculate hand reach distances at various planes. Data courtesy of Pheasant, Woodcock and Tillman and NASA-STD-3000.

Hazards checklist. Checklists are one of those ubiquitous tools of safety, and perhaps they deserve a closer look. A paper that collates various hazard checklists together and provides some commentary on their use, advantages and disadvantages.

Human error in pictures. Human factors can be a bit dry, so here’s my attempt to liven it up in an occasional series of posters on human error.

MIL-STD-882 Hazard Risk Matrix (Modified). A modified version of the venerable subjective 882 hazard risk matrix. I’ve translated the matrix into cartesian coordinates, revised the risk zone curves, likelihood, severity bin definitions to make the matrix ‘De Moivre theorem’ compliant, added the AIAA’s combinatorial probability thresholds to all the combination of subjective probabilities, introduced a calibration point and added the ALARP principal. The latest version adjusts the risk boundaries for irreversible loss events and places claim limits for risk on systems where a SPOF and Catastrophic severity of loss both exist.

Requirements compliance and risk assessment. A simple risk assessment method for requirements, proudly borrowed from NASA, focuses on the degree of feasibility as a metric of technical risk, there are others of course.

The WHS act for engineers. A short brief for engineers practicing on Australia on the WHS Act and it’s implications for design activities.