Rates of Change
Dave Jesse on February 13, 2017

One of our analysts asked if I had written a blog about how we calculate vertical speed, and I said “of course I did, ages ago”. There followed a 15-minute hunt for the subject and eventually I had to admit that it was missing, so here goes with a quick blog to plug a gap […]

Where an Aircraft Lands – Part 3
Dave Jesse on February 6, 2017

We found out which airfield the aircraft landed at, and now need to pick the right runway. Selecting the Runway From basic flight phase analysis we know when the landing roll took place. Using the recorded heading we take the median heading during the landing roll as the direction of the runway. Note that we […]

Where an Aircraft Lands – Part 2
Dave Jesse on January 30, 2017

My last post talked about some of the problems with finding out exactly where an aircraft lands. Now I will start to look at how the system works in practice. Pick an Airfield I will skip over the detail of how to identify the point of landing (this was covered in an earlier blog), so […]

Where an Aircraft Lands
Dave Jesse on January 13, 2017

Some time ago I was asked to write about how the POLARIS software decides where an aircraft lands. At the time we knew of some limitations of the system and were planning to revise that part of the analysis, so it seemed sensible to hold on until that revision had been completed. These limitations have […]

Why Smoothing?
Dave Jesse on January 5, 2017

Occasionally I have been asked why parameters in the POLARIS software are described as “Smoothed”. You will find Smoothed versions of Latitude and Longitude, Altitude STD, Gross Weight and soon to be Pitch and Roll (we are adding these to provide cosmetic improvements for visualisation displays). It’s a bit of a history lesson, so makes […]

Keeping up to date
Dave Jesse on December 21, 2016

It is important in flight safety, as with most other things in life, to keep up with changes in regulations and procedures, and to keep up with industry best practice. It occurred to me that one safety lesson which I was told many years ago by my old friend and mentor, Capt Simon Searle, should […]

Unsocial Networking
Dave Jesse on December 14, 2016

  Normally I write about flight data and technical stuff, and try to avoid anything relating to business. Today is an exception and I hope you will allow me one digression to “get this off my chest”. Since we started Flight Data Services our web site has carried notes about the people in the company. […]

Why You Can’t Land in Scatsta
Dave Jesse on November 4, 2016

  For those of you not fully familiar with the northern Scottish isles, Scatsta is a small airfield on the Shetland Islands and the closest land airport to the North Sea oil rigs. It is mainly used for oil and gas workers changing from fixed wing services to helicopters, making the helicopter journey as short […]

Where the Data Did Go…?
Dave Jesse on October 19, 2016

In my last two blogs I explained that we had identified a problem where small amounts of data were occasionally being lost with uQAR-equipped aircraft. After ten years of satisfactory operation, this was very puzzling. I also outlined how we built a test set using a Raspberry Pi computer and showed some sample test data. […]

Of Raspberries and Pies
Dave Jesse on October 13, 2016

In my previous post I explained that we were suffering data loss, and needed to be able to test the uQAR with various different recorder and data card combinations. This unusual post explains how we built a test rig and what we found. Introduction to the Raspberry Pi If you have come across the Raspberry […]