Summary
We propose to supersede an existing airworthiness directive (AD) that applies to certain Fokker Services B.V. Model F.28 Mark 0070 and 0100 airplanes. The existing AD currently requires performing a detailed visual inspection for cracks of the pistons on the main landing gear (MLG), and replacing the affected pistons if necessary. Since we issued that AD, a new modification has been developed to safeguard the integrity of the MLG assembly and improve surface protection of the affected area of the MLG piston. This proposed AD would also require modifying the MLG by installing a piston containing a certain part number, and revising the aircraft maintenance program. We are proposing this AD to prevent MLG failure, possibly resulting in loss of control of the airplane during the landing roll-out.