Flight Data Simulation

Flight Data Simulation can solve some of your most challenging anomalies

At our advanced flight data analytics lab, we employ flight data simulation to solve all sorts of industry parameter, acquisition, transmission, and recording issues. We’ve applied flight data simulation to everything from flight data certification and test up to and including support for military level data analytics and diagnostics.

Customer A used our flight data simulator for black box data erasure to avoid data theft during transit of the unit to the repair station.

Customer B flew our in-class aircraft simulator which generates flight data parameter outputs in order to grasp the essentials of FDM analysis.

Customer C is interested in applying our flight data simulator in a troubleshooting environment where the signal line between the DFDAU and SSFDR is suspect.

How will you apply flight data simulation to solve some of your challenges?

FAQ’s

View our Q&A list to understand how flight data simulation is applied!

We need to ship our SSFDR to the factory for repair, but it contains latitude and longitude, flight numbers, and other identifying information. We would hate for this critical information to fall into the wrong hands in the event the SSFDR does not reach it’s final destination. Can you provide us with a method or device for erasing the SSFDR data before we ship it?

Absolutely. Our Labworx T717 mini-DFDAU transmits ARINC 717 data and has been employed for erausre of SSFDR data in the past. You can rent or purchase the unit based on your operational needs.

I can’t seem to find the recording speed capacity of my SSFDR in any documentation. Our system underwent several modifications in the past and unfortunately the paper trail does not provide any clues. How can I apply flight data simulation to solve this mystery?

By simulating the flight data input to your SSFDR, we can determine your recording capacity. For example if we transmit 64wps from our Labworx T717 transmitter into your SSFDR and discover 50 hours of data, this would equate to an SSFDR recording capacity of 128wps....so forth and so on.

We need to upgrade our DFDAU dataframe from 256 to 512wps. While we do believe recording parameters at a higher sampling rate will improve the fidelity of our FDM program, we lack hard core proof in the form of analytics, which is making it difficult to justify the cost and benefits to upper management. This may be an edge case but we are wondering if flight data simulation can be used to generate the required substantiation?

For this one, we will allow you to fly the flight simulator at our laboratory and study the various parameter sampling rate outputs, in all phases of flight, and in various extreme conditions and aircraft attitudes, both in graphical and tabular format. From this exercise, you will record and plot the dynamic recording range and data points under varying rates of change which will provide you with the exact proof you are searching for.

We need to accomplish a full functional test of all SSFDR recorded parameters. Our AMM does not provide a test procedure for this. Can you assist us with simulating or developing the missing test procedures?

Sure, this is one of our favorites. It can be quite difficult to test certain parameters without the aircraft being airborne and in a state which accomodates advanced parameter tests and validation. We’ll use ARINC 717, 429, and other databus transmission protocols to simulate and stimulate your aircraft recording system while on the ground, thereby eliminating the need for factory testing.

Learn more about how Flight Data Simulation can benefit your organization.

Learn more about how DAE for Aerospace can benefit your organization

How do I modify my FDR to record more than 25 hours?

You can modify the program pins at the rear of the SSFDR to uptick your recording hours. For example, if you have a Honeywell PN 980-4700-XXX installed, you can alter the ‘ground/open’ discrete wiring at pin 17 & 18 of the SSFDR mating connector to increase your recording capacity.

How can determine the amount of hours recorded by my FDR?

The amount of recorded hours is dependent on a combination of your FDAU wps output and FDR maximum allowable recording speed. If there is a one to one relationship between the two units, i.e. – 64 wps FDAU with a 64 wps FDR, you will record the last 25 hours of flight data. This also applies to the case when the FDAU and FDR are both 128wps, 256wps, or even higher. If there is a mismatch between the FDAU and FDR speed, a small and simple calculation can be made to determine actual flight hour recording capacity. See the figure below for the various possibilities:

How can I determine the speed of my Flight Data Recording system in words per second (wps)?

There are basically 4 ways to determine your speed, with the 4th being a bit more involved. First, the speed should be listed or documented in chapter 31 of your aircraft Maintenance Manual and/or Wiring Diagram Manual. However there are times when for some reason, the required information cannot be found. If this is the case, as a second method, you may reference the CMM or technical specification for your Flight Data Acquisition Unit (FDAU). If you are still unable to find this information, you may contact the aircraft manufacturer for the wps or review your previous FDR download analysis reports. Please keep in mind, the OEM will only know the as-delivered configuration of your aircraft. If there were modifications to your aircraft post-delivery – manufacturer unaware of the changes – youll need to contact us for an analysis of your raw data. Using our software we can determine the wps of your system.

With regard to Flight Data Recorder Systems, what exactly does wps imply? I have noticed this abbreviation in our FDR documentation and in communications with the manufacturer several times:

WPS = words per second. A word (12-bits in length) contains binary data which represents a specific parameter value. Please see figure 1 below. Your FDR records in frames (4 second intervals) and each frame contains 4 sub frames (one sub frame = 1 second). With each second that goes by a specific quantity of words are recorded into memory. If you operate a 64 wps FDR system, you will record 64 12-bit words in one second. The higher the word capacity the more information you can record.

What is a Dataframe Layout (DFL)?

A DFL, also known by the name Logical Frame Layout (LFL), Dataframe Interface Control & Requirements Document, and many other names depending on the manufacturer, is a document which specifies the FDR, QAR, or DAR Parameter Word (location), Recording Speed, Sampling Rate, Bits, and Conversion formulae for your recording system.  

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