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Flight Calibration Services Limited 
Calibration House
17-19 Cecil Pashley Way 
Shoreham BN43 5FF
Latest News
Monday 26 April - 14:23

April 2021


FCSL with ITN Productions and The AoA have produced the following 4 minute video clip which provides a brief overview of the FCSL Flight Inspection Service

Monday 26 April - 14:00

January 2021


FCSL have signed a long term Contract with the Irish Aviation Authority to Flight Check all their Navaids Country-wide including Dublin, Shannon and Cork

Wednesday 05 May - 12:13

April 2021


FCSL and Mopiens signed a Contract  to Flight Check several VOR Navids located in Morocco in 2021

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FCSL | Flight Test | The ONLY Independent Flight Test Company in Europe

Flight Inspection System                                        

Automatic Flight Inspection System (AFIS)

The AFIS "GPS only" Flight Inspection System is highly portable and totally automated; it meets and exceeds the requirements of UK CAA CAP 670 and ICAO Doc 8071. It is a compact design that provides all the features of much larger systems.

The AFIS includes features such as temperature and calibration monitoring, self-diagnosis and automatic log keeping. Data collection and analysis is automatic and comprehensive with synchronous position and event marking.

Detailed analysis colour plots are produced in real time as each flight inspection progresses. The plots are later reproduced from the collected data on the ground.

The real time data can also be transmitted to a remote terminal for ground engineers to monitor during the flight inspection (a useful feature during commissioning work).

The AFIS system comprises airborne equipment and a ground based Differential GPS (DGPS) system, which is located at a convenient pre-surveyed position at each airport. The ground equipment is normally sited away from aircraft manoeuvring areas to minimise any operational disruption.

Airborne Equipment

 New FIS 2

The AFIS airborne equipment comprises a small lightweight unit housing the specialist navaid receivers, GPS receiver, data collection computer, telemetry transceiver and an operator laptop. The AFIS also includes a separate pilot's head up display to assist with guidance and awareness.

The AFIS equipment uses its own SBAS system to determine the aircraft's position in space within 20mm accuracy and to ensure accurate and repeatable results.

The pilots head up guidance display provides the pilots with situational awareness and accurate guidance during the inspection runs. Each profile run is preprogramed into the system and can be selected by either the flight inspector or the pilots using the touch screen interface.

The laptop computer provides the flight inspector with all the real time inspection and positioning data. The flight inspection software runs in a user friendly Windows environment using multifunction facilities with the data presented in a clear and precise graphical format.

Recent AFIS Developments include;

  • Multiple DME capability - that includes simultaneous measurement up to 10 DME channels, detailed pulse shape analysis, analysis of multipath propagation effects and GPS time-stamping. This capability has been developed for validation and approval of DME-DME RNAV instrument procedures.
  • Inertial Navigation System (INS) - an integral INS has been developed to supplement the GPS positioning data in areas with poor coverage or suffering from local interference. This enables the FIS to provide a “synchronous” position, attitude, heading and pitch/roll information completely independent of the aircraft’s avionics and navigation systems. The technology brings together two different but complementary technologies:
    -        Differential Global Positioning System (D-GPS)
    -        Inertial Navigation System (INS)
    The absolute accuracy of D-GPS and the stability of the INS are tightly coupled to provide an exceptional 3D navigation solution with accuracy of ±20 mm that is stable and continuously available, even when the GPS satellite signals are blocked or suffering from local interference.
  • GNSS Augmentation - FCSL has successfully demonstrated that the accuracy of the geostationary TerraStar satellite precision positioning GNSS augmentation service is within the FIS 5000’s Measurement of Uncertainty defined limits for ILS Cat III operations. Provided there is sufficient GNSS augmentation service, the FIS 5000 no longer requires a dedicated ground-based Position Reference System (PRS) to provide differential position corrections. Not having to deploy and recover the PRS reduces the overall time for each flight inspection and minimizes disruption to normal airport operations.
  • GBAS - The FIS 5000 is equipped with a GBAS receiver and is able to check VDB coverage volume in accordance with ICAO Doc 8071 including the signal level measurements and spectrum analysis of the VDB and GPS spectrums. The flight inspection aircraft is fitted with GBAS aerials on the underside of the airframe to detect interference from the below.

Ground-based Precision Reference System (PRS)

The PRS unit provides DGPS corrections to the aircraft to enable the AFIS airborne equipment to fix its position in space within ±20mm. The accuracy of this GPS only system far exceeds the flight inspection requirements for precision approach aids, such as PAR and ILS Cat III. 

new pic for fis page 2

The ground equipment is temporarily deployed at a convenient pre-surveyed point on the airport, which is normally remote from aircraft and vehicle operational areas.

The unit is entirely automated and is left unattended during the flight inspection. DGPS correction data is sent to the airborne flight inspection system via a dedicated telemetry link.  Guidance information and inspection analysis is then provided to the pilot in real-time.

System Features

The PRS is a very compact lightweight box and antenna unit designed for ease of transportation and deployment. The ground equipment comprises:

(i)   24-channel dual-frequency DGPS/RTK base station

(ii)  Telemetry transceiver with antenna & pole

(iii) Self-contained battery for up to 12 hours operation.



Mobile Flight Inspection System

Flight Calibration Services Ltd (FCSL) provides a mobile AFIS that is capable of easy installation on locally based light or medium size aircraft. This is a flexible cost effective solution for commissioning and maintaining navaids at airports in remote locations where the cost of deploying a Flight Check Aircraft is uneconomical.

The compact lightweight design enables the equipment and crew to be deployed worldwide at short notice by commercial airline.

The installation process is relatively simple, typically only taking 20-30 minutes, utilising existing aircraft antennas and power sources. The mobile AFIS does not require any structural changes to the aircraft's airframe or any additional antennas to be fitted to the aircraft.

The Mobile AFIS solution utilising local aircraft offers customers a cost effective and rapid response capability.