Airworthiness Directive · Amendment 39-19514 · Landing gear
Fokker Services B.V. Airplanes
This AD applies to Fokker Services B.V. Model F28 Mark 0070 and 0100 airplanes, certificated in any category, all serial numbers.
We are adopting a new airworthiness directive (AD) for all Fokker Services B.V. Model F28 Mark 0070 and 0100 airplanes. This AD was prompted by reports that debris from the parking brake shut off valve (PBSOV) could create a partial blockage of the restrictor check valve in the hydraulic return line of the PBSOV. This AD requires replacing the restrictor check valve with an improved valve that has a filter screen. We are issuing this AD to address the unsafe condition on these products.
For the purposes of this AD, the definitions in paragraphs (g)(1) through (g)(3) apply.
(1) An affected part is any hydraulic restrictor check valve having part number (P/N) D71293-003, P/N D71295-401, or P/N D71296-401.
(2) Group 1 airplanes are those that have an affected part installed.
(3) Group 2 airplanes are those that do not have an affected part installed.
For Group 1 airplanes, within 24 months after the effective date of this AD, modify the airplane by replacing each affected part with a restrictor check valve that has a filter screen, P/N CKLX0517200B or P/N CKLX0520100B, as applicable, in accordance with the accomplishment instructions of Fokker Service Bulletin SBF100-32-163, Revision 1, dated February 21, 2018.
