Technology Overview


Technology Overview
Updated 25th May 2019

Bad air data and the confusion that can arise when pilots are presented with information not known to be false, can start a chain of events which may threaten the safety of the aircraft. Pitot Guardian technology is designed to be deployed on Total and Static pressure ports & probes and warn when air data is likely to be false.

While developing the system we have always had in mind that we want to alleviate this cockpit confusion by presenting clear information that when air speed indication is not correct on one or more air speed indicator (ASI), the pilot can know the moment it is happening and focus on either a good ASI, or refer to the aircraft manual on correct procedures for loss of air speed indication, saving valuable time. An example demonstrating this need for situation awareness can be found in a *UAE GCAA report in relation to Etihad Airways A6-EHF Airbus A340-600 (non-serious incident); that there may be cases where NO ECAM alert is triggered and cockpit indications appear normal whereas they are actually false. As such, flight crews must have in mind those symptoms and be able to detect such a problem. Having a Pitot / static blockage detection sensor embedded in to each ADU would ensure ADR's detect all failures.

Shortly after the loss of Air France flight 447 in June 2009 we set about developing a robust means of detecting anomalies in Pitot static systems which give rise to false air speed data being presented to pilots. Looking into existing efforts in this field it was decided that not enough was being done to address the issue, and some attempts were looking at over-complicated or impractical solutions. By late 2009 a broad patent was filed while simple working 'proof of principle' prototypes were being put together. During 2013 we began liaising with the aerospace industry on how best to proceed and we've been working hard building more and more robust devices all the while shrinking the required hardware and further developing our code to where it is today.

We now have a device which operates using our proprietary software algorithms in conjunction with a 'single chip' controller and novel sensing method capable of performing all the required tasks involved in monitoring and reporting when blockages or other abnormalities are causing false air speed data regardless of external acoustic and inertial influences.

Pitot Guardian® technology is designed to be embedded within the aircraft's fuselage mounted air data module (ADM or ADU) from where it continuously monitors the architecture of the Pitot probe all the way to the tip plus a short distance in front of the probe aperture, with various other configuration options such as 'in line' for aftermarket installation to pneumatic systems. The devices have been tested in simulated flight conditions including wind tunnel and vibration analysis, where they continue to operate and report as designed. Capabilities include (but not limited to);  High speed in flight and ground detection of port / probe blockage before start up, early warning of impending blockage, Insect Habitation, Pitot Icing (high altitude and flash), Volcanic ash ingress and erosion or other types of probe damage likely to present false air speed data.


Vibration Testing January 2018
Wind Tunnel Performance Tests July 2017

Patent #GB2478522B (Aircraft Pitot/Static Warning System)
Other Additional patents pending.
Pitot Guardian­® Is a registered trademark covering our technology for the detection of blockages within aircraft Pitot static systems and the core software controlling the instrumentation for detection of blockages and anomalies within aircraft Pitot static systems.
*UAE GCAA Ref: AAIS Case Reference 05/2013



Contact us for more information .
Nick Haddock
E: sales@nhtechnologies.co.uk
T: 0044 (0)1795 555011
M: 0044 (0)7855 807646