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F254-Z3248 - Weapons Bay Door Test Rig

Customer: UK based aerospace company
Loadcell: F254-Z3248 12kN
Generic Type: Fatigue rated pancake loadcell
Special Features: Extraneous force immunity

The customer required a means of measuring the force on an actuator closing a weapons bay door on a fighter aircraft. The installation required an axial force application to the loadcell via a lever system, which required a degree of transverse freedom to function correctly.

The loadcell would be able to accommodate a defined internal movement of the input force centre whilst maintaining a solid load path between the actuator and door structure in its axial measurement sense.

The design used a standard design pancake loadcell, which incorporated a polarised flexure to allow a ±0.5mm deflection adjacent to the loading axis while still being able to transmit the load to the loadcell. The loadcell itself incorporated a moment insensitive bridge using 16 gauge sites to reduce the effect of the applied moment through the flexure.