Summary
We propose to adopt a new airworthiness directive (AD) for all Fokker Services B.V. Model F28 airplanes. This proposed AD was prompted by reports that certain T-unions with an integral filter in the landing gear hydraulic control system disconnected from their housing and, in some cases, migrated. This proposed AD would require replacing certain T-unions with an integral filter with T-unions without an integral filter. We are proposing this AD to address the unsafe condition on these products.