Unapproved modifications identified on RAF 2000 GTX-SE during flight testing

Casualties unknown • Black Notley, Essex, GB

An investigation into the flight testing of a RAF 2000 GTX-SE, registration G-CBAG, revealed that unapproved stabilizers had been installed without regulatory oversight.

What happened

During the flight investigation and acceptance testing of a RAF 2000 GTX-SE, registration G-CBAG, in Black Notley, Essex, on 17 May 2002, it was discovered that the aircraft had been modified with additional aerodynamic surfaces. These modifications involved the installation of a dual fin stabilizer featuring a small horizontal section.

The investigation

The investigation examined the circumstances surrounding the aircraft's presentation for CAA acceptance. While initial reports suggested the stabilizers were part of the original test submission, the investigation established that these components were actually fitted during the flight investigation process itself. Crucially, these changes were implemented without consulting the CAA.

Findings

  • The installation of the dual fin stabilizer and horizontal section constituted an unapproved modification.
  • Because the modifications were performed without regulatory reference, they fell outside the established terms of reference for the flight investigation.
  • The presence of these unauthorized surfaces invalidated the existing Permit to Fly for Test Purposes.
  • The CAA subsequently instructed that the additional surfaces be removed before any further flight operations could occur.

Probable cause

The aircraft was operated with unapproved modifications, specifically a dual fin stabilizer, which were installed during flight testing without CAA consultation, thereby invalidating the Permit to Fly.

Frequently asked questions

What happened in the 2002-05-17 RAF 2000 GTX-SE accident near Black Notley, Essex, GB?

An investigation into the flight testing of a RAF 2000 GTX-SE, registration G-CBAG, revealed that unapproved stabilizers had been installed without regulatory oversight.

What aircraft was involved and where did it happen?

The accident on 2002-05-17 involved a RAF 2000 GTX-SE, registration G-CBAG, at Black Notley, Essex, GB.

What was the probable cause of the accident?

The aircraft was operated with unapproved modifications, specifically a dual fin stabilizer, which were installed during flight testing without CAA consultation, thereby invalidating the Permit to Fly.

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