Summary
We propose to supersede Airworthiness Directive (AD) 2002-23- 20, for certain Dassault Aviation Model FALCON 900EX and MYSTERE-FALCON 900 airplanes. AD 2002-23-20 currently requires repetitive operational tests of the flap asymmetry detection system to verify proper functioning, and repair if necessary; repetitive replacement of the inboard flap jackscrews with new or reconditioned jackscrews; and repetitive measurement of the screw/nut play of the jackscrews on the inboard and outboard flaps to detect discrepancies, and corrective action if necessary. AD 2002-23-20 currently requires a revision of the airplane flight manual. Since we issued AD 2002-23-20, the maintenance manual has been revised. This proposed AD would require revising the maintenance or inspection program, as applicable, to include the maintenance tasks and airworthiness limitations specified in the Airworthiness Limitations section of the airplane maintenance manual. This proposed AD also removes the Model FALCON 900EX airplanes from the applicability of the existing AD. We are proposing this AD to prevent reduced structural integrity of the airplane.