A Sample of America
on June 10, 2016

A Sample of America After a few simple blog posts, here is a slightly more tricky one to get your head around. We’ll need to do some background plodding before we get to the meat of the matter. I think it’s worth the effort because, as with all the best stories, there is a surprise […]

More on Interesting Times
on June 3, 2016

More on Interesting Times On 20th May I wrote about “Interesting Times” and cited a helicopter accident that happened on 29th April in Norway. This blog is a comment on the investigation process, an update on that accident and a brief explanation of epicyclic transmissions for the non-rotor aviators. Accident Investigations There are commonly complaints […]

ARINC 767 but not the plane
on May 27, 2016

ARINC 767 but not the plane Always one for a gratuitous picture of a nice aeroplane, here is a 3D model of a Boeing 767. And here is a Boeing 787 Recording Formats This is the standard that defines the flight data recorder format used on the Boeing 787 Dreamliner. It’s nothing to do with […]

Interesting Times
on May 20, 2016

Interesting Times There is a saying: “May you live in interesting times”. These certainly are interesting times. I was part way through writing a blog about the recent accident in Norway when I heard of the loss of an Egyptair Airbus A320, less than three weeks later. The Helicopter On 29 April, an Airbus Helicopters […]

Who works on Sundays?
on May 11, 2016

These guys do. I’ll explain who they are at the end of the blog. We will get there via a diversion about repository activity tracking and large data analysis. New software being written If you are ever curious about how much work is going on behind the scenes to bring you the POLARIS software, you […]

Breaking Boundaries
on May 3, 2016

As both avid readers of my blog will know, I am very keen on data sharing. This allows us to learn from each other, both to find out what we are doing badly and to help to identify best practice. Indeed, data driven analysis of safety is now recognised as the mainstay of current aviation […]

Data Cleansing: Expected Values
on April 1, 2016

Sometimes you just know what the answer should be. This is the simple basis for the Expected Value test and these come in two flavours. Strawberry and Vanilla might be more interesting than Discrete and Analogue, but we have to do the dull stuff sometimes. Discrete Expected Values Let’s test the idea so you know […]

Data Cleansing: Noise Tests
on March 18, 2016

Picking up from the previous blogs, we have data which is not ARINC 429 No Computed Data, has a significant change in value over the period we are examining, is within reasonable range of values and does not change too quickly. The next step is to see if it too noisy. Here is a clear […]

What is a Semi-Automated FDR Readout?
on March 10, 2016

Assessing a Flight Data Recorder for the serviceability of the recorded parameters is currently achieved by a Flight Data Specialist looking at each and every recorded parameter to check the serviceability of each one. This is a good way to analyse the quality of a parameter, until it becomes routine and boredom sets in. When […]

Data Cleansing: Introduction of Flight Phases
on February 19, 2016

  Why old boots in data cleansing? Read on to find the even more tenuous link than the last excuse for a picture. Some signals change their characteristics during the flight, e.g. between taxiing and flight, or between cruise and low level. Consider the Acceleration Normal signal. It will have a very low noise level […]