Data Cleansing: Expected Values
Dave Jesse 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
Dave Jesse 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?
Catalin Sindilaru 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
Dave Jesse 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 […]

Data Cleansing: Rate of Change Tests
Dave Jesse on February 5, 2016

Nearly three weeks ago I said that “Next week we will look at rate of change limits”. Well, OK, I never was very good at planning, but as they say, “better late than never”. Following on from min-max limits comes a rate of change limit. As I have said before, albeit intermittently, there is nothing particularly challenging […]

Dave Jesse on January 5, 2016

Happy New Year May I first wish both readers of the blog a Happy New Year. I hope that it is a prosperous, joyful and safe year for all of us. Now, it’s been a while since last I wrote about data cleansing and there is still some way to go, so here comes another […]

Blog from Rwanda
Dave Jesse on December 10, 2015

Image: The Attendees of The Safety in African Aviation Conference 2015, Rwanda    This week we’ll take a break from data cleansing because I recently attended the Aviassist Safety in African Aviation (SIAA) Conference. This year we were hosted by RwandAir and the Rwanda CAA in Kigali. As well as the busy two-day conference, I […]

When data is Not Computed
Dave Jesse on November 25, 2015

When is a goal not a goal? When the player is off side. Similarly, when is a parameter not a parameter? When it is Not Computed. Obvious, eh? Having made that clear, those who understand can go and make a coffee. Those who don’t must enter the world of ARINC 429 digital communications.ARINC 429Let me […]

On Checking Data Frame Documentation
Dave Jesse on November 6, 2015

Working in the world of safety we become accustomed to the concept of human error. “Errare humanum est”. I wonder how many children get taught Latin in school these days? But I digress. The key thing is that we all make mistakes and the engineers who write data frame documentation are no exception. The majority of […]

Layer Cake
Dave Jesse on October 19, 2015

  There’s nothing better than cake at midday. The only thing is, you need a good excuse. Last week we cut a Flight Data Recorder cake to celebrate the launch of our Express Readout product, which engineers can use to perform the mandatory checks of data quality for FDRs. Normally I wouldn’t cover this sort […]

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